{"id":15045,"date":"2022-09-06T15:30:55","date_gmt":"2022-09-06T10:00:55","guid":{"rendered":"https:\/\/btechgeeks.com\/?p=15045"},"modified":"2022-09-06T15:36:22","modified_gmt":"2022-09-06T10:06:22","slug":"abstract-windows-toolkit-awt-interview-questions-in-java","status":"publish","type":"post","link":"https:\/\/btechgeeks.com\/abstract-windows-toolkit-awt-interview-questions-in-java\/","title":{"rendered":"Java swing interview questions – Abstract Windows Toolkit (AWT) Interview Questions in Java"},"content":{"rendered":"

Java swing interview questions: <\/strong>List of topic-wise frequently asked java interview questions<\/a> with the best possible answers for job interviews.<\/p>\n

Abstract Windows Toolkit (AWT) Interview Questions in Java<\/h2>\n

Question 1.
\nWhat is meant by controls and what are the different types of controls in AWT?
\nAnswer:
\nControls are components that allow a user to interact with your application and the AWT supports the following types of controls:
\nLabels, Push Buttons, Check Boxes, Choice Lists, Lists, Scrollbars, Text Components. These controls are subclasses of Component.<\/p>\n

Question 2.
\nWhat is the difference between choice and list?
\nAnswer:
\nA Choice is displayed in a compact form that requires you to pull it down to see the list of available choices and only one item may be selected from a choice. A-List may be displayed in such a way that several List items are visible and it supports the selection of one or more list items.<\/p>\n

Question 3.
\nWhat is the difference between scrollbar and scrollpane?
\nAnswer:
\nA Scrollbar is a Component, but not a Container whereas Scrollpane is a Container and handles its own events and performs its own scrolling.<\/p>\n

Question 4.
\nWhat is a layout manager and what are the different types of layout managers available in java.awt?
\nAnswer:
\nA layout manager is an object that is used to organize components in a container. The different layouts are available are FlowLayout, BorderLayout, CardLayout, GridLayout, and GridBagLayout.<\/p>\n

Question 5.
\nHow are the elements of different layouts organized?
\nAnswer:
\nFlowLayout:<\/strong> The elements of a FlowLayout are organized in a top to bottom, left to right fashion.
\nBorderLayout:<\/strong> The elements of a BorderLayout are organized at the borders (North, South, East, and West)and the center of a container.
\nCardLayout:<\/strong> The elements of a CardLayout are stacked, on top of the other, like a deck of cards.
\nGridLayout:<\/strong> The elements of a GridLayout are of equal size and are laid out using the square of a grid.
\nGridBagLayout:<\/strong> The elements of a GridBagLayout are organized according to a grid.
\nHowever, the elements are of different sizes and may occupy more than one row or column of the grid. In addition, the rows and columns may have different sizes.<\/p>\n

Question 6.
\nWhich containers use a Border layout as their default layout?
\nAnswer:
\nWindow, Frame, and Dialog classes use a BorderLayout as their layout.<\/p>\n

Question 7.
\nWhich containers use a Flow layout as, their default layout?
\nAnswer:
\nPanel and Applet classes use the FlowLayout as their default layout.<\/p>\n

Question 8.
\nWhy the container does not support multiple layout managers?
\nAnswer:
\nbecause when u r using a particular layout manager it useful frame for work you can use a grid bag layout for this purpose.<\/p>\n

Question 9.
\nWhat is clipping?
\nAnswer:
\nClipping is the process of confining paint operations to a limited area or shape.<\/p>\n

Question 10.
\nWhat is meant by controls and what are the different types of controls in AWT?
\nAnswer:
\nControls are components that allow a user to interact with your application and the AWT supports the following types of controls:
\nLabels, Push Buttons, Check Boxes, Choice Lists, Lists, Scrollbars, Text Components. These controls are subclasses of Component.<\/p>\n

Question 11.
\nWhat is the difference between choice and list?
\nAnswer:
\nA Choice is displayed in a compact form that requires you to pull it down to see the list of available choices and only one item may be selected from a choice. A-List may be displayed in such a way that several List items are visible and it supports the selection of one or more list items.<\/p>\n

Question 12.
\nWhat is the difference between scrollbar and scrollpane?
\nAnswer:
\nA Scrollbar is a Component, but not a Container whereas Scrollpane is a Container and handles its own events and performs its own scrolling.<\/p>\n

Question 13.
\nWhat is a layout manager and what are the different types of layout managers available in java.awt?
\nAnswer:
\nA layout manager is an object that is used to organize components in a container. The different layouts are available are FlowLayout, BorderLayout, CardLayout, GridLayout, and GridBagLayout.<\/p>\n

Question 14.
\nWhat is a Layout Manager and what are the different Layout Managers available in java.awt and what is the default layout manager for the panel and the panel subclasses?
\nAnswer:
\nA layout manager is an object that is used to organize components in a container. The different layouts are available in java.awt is:<\/p>\n

\u2022 FlowLayout: The elements of a FlowLayout are organized in a top to bottom, left to right fashion.<\/p>\n

\u2022 BorderLayout: The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container.<\/p>\n

\u2022 CardLayout: The elements of a CardLayout are stacked, one on top of the other, like a deck of cards.<\/p>\n

\u2022 GridLayout: The elements of a GridLayout are of equal size and are laid out using the square of a grid.<\/p>\n

\u2022 GridBagLayout: The elements of a GridBagLayout are organized according to a grid. However, the elements are of different sizes and may occupy more than one row or column of the grid. In addition, the rows and columns may have different sizes.
\nThe default Layout Manager of Panel and Panel sub-classes is FlowLayout.<\/p>\n

Question 15.
\nWhich containers use a Border layout as their default layout?
\nAnswer:
\nWindow, Frame, and Dialog classes use a BorderLayout as their layout.<\/p>\n

Question 16.
\nWhich containers use a Flow layout as their default layout?
\nAnswer:
\nPanel and Applet classes use the FlowLayout as their default layout.<\/p>\n

Question 17.
\nAssume that g is an object belonging to the Graphics class. What image would be produced by the following commands? Draw a picture as part of your answer.
\ng;setColor(Color.gray);
\ng.fiIlRect(0,0,40,40);
\ng.fillRect(50,50,0,0);
\ng.setColor(Color.black);
\ng.fill0val(50,0,40,40);
\ng.fill0val(0,50,40,40);
\nAnswer:
\nThe method \u201cg.fillRect(x,y,w,h)\u201d draw a solid rectangle with its upper left corner at the point (x,y). The other two parameters, w, and h, give the width and height of the rectangle. In the second line \u201cg.fillRect(50,50,0,0)\u201d doesn\u2019t produce any image at all, since the width and height are specified as zero. The method \u201cg.fillOval(x,y,w,h)\u201d draw a solid oval that just fits inside the rectangle with upper. left corner at (x,y) and with width w and height h. So, the picture produced contains one gray square and two black circles, arranged like this:
\n(Note: I actually meant the second fine to be \u201cg.fillRect(50,50,40,40).\u201d Without this typo, the picture would have another gray square.)<\/p>\n

Question 18.
\nWhat is the use of the window class?
\nAnswer:
\nThe window class can be used to create a plain, bare-bones window that does not have a border or menu. The Window class can also be used to display introduction or welcome screens.<\/p>\n

Question 19.
\nWhat are the benefits of Swing over AWT?
\nAnswer:
\nSwing components are lightweight. We can have a pluggable look & feel feature that shows us how they appear on other platforms. We can add images to Swing components. We have toolbars and tooltips in Swing.<\/p>\n

Question 20.
\nWhere the CardLayout is used?
\nAnswer:
\nCard Layout is used where we need to have a bunch of panels or frames one laying over another. It is replaced by TabbedPane in Swing.<\/p>\n

Question 21.
\nWhat is the difference between Grid and GridbagLayout?
\nAnswer:
\nIn Grid layout, the size of each grid is constant whereas in GridbagLayout grid size can Vareid.<\/p>\n

Question 22.
\nHow will you add a panel to a Frame?
\nAnswer:
\nFrame.add(panel,BorderLayout.NORTH) or Frame.add(panel,\u2019\u2019North\u201d).<\/p>\n

Question 23.
\nWhat is the use of the window class?
\nAnswer:
\nThe window class can be used to create a plain, bare-bones window that does not have a border or menu. The Window class can also be used to display introduction or welcome screens.<\/p>\n

Question 24.
\nWhat is the difference between a Window and a Frame?
\nAnswer:
\nThe Frame class extends Window to define the main application window that can have a menu bar.<\/p>\n

Question 25.
\nWhat is the difference between the Font and FontMetrics classes?
\nAnswer:
\nThe FontMetrics class is used to define implementation-specific properties, such as ascent and descent, of a Font object.<\/p>\n

Question 26.
\nFor which statements does it make sense to use a label?
\nAnswer:
\nThe only statements for which it makes sense to use a label are those statements that can enclose a break or continue statement.<\/p>\n

Question 27.
\nWhich TextComponent method is used to set a TextComponent to the read-only state?
\nAnswer:
\nsetEditable( )<\/p>\n

Question 28.
\nHow are the elements of a CardLayout organized?
\nAnswer:
\nThe elements of a CardLayout are stacked, one on top of the other, like a deck of cards.<\/p>\n

Question 29.
\nWhat advantage do Java\u2019s layout managers provide over traditional windowing systems?
\nAnswer:
\nJava uses layout managers to layout components in a consistent manner across all windowing platforms. Since Java\u2019s layout managers aren\u2019t tied to absolute sizing and positioning, they are able to accommodate platform-specific differences among windowing systems.<\/p>\n

Question 30.
\nWhat is the difference between the paint( ) and repaint( ) methods?
\nAnswer:
\nThe paint( ) method supports painting via a Graphics object. The repaint( ) method is used to cause paint( ) to be invoked by the AWT painting thread.<\/p>\n

Question 31.
\nWhich class is the immediate superclass of the Container class?
\nAnswer:
\nComponent<\/p>\n

Question 32.
\nHow can the Checkbox class be used to create a radio button?
\nAnswer:
\nBy associating Checkbox objects with a CheckboxGroup.<\/p>\n

Question 33.
\nName four Container classes.
\nAnswer:
\nWindow, Frame, Dialog, FileDialog, Panel, Applet, or ScrollPane<\/p>\n

Question 34.
\nWhat Checkbox method allows you to tell if a Checkbox is checked?
\nAnswer:
\ngetState( )<\/p>\n

Question 35.
\nHow are the elements of a GridLayout organized?
\nAnswer:
\nThe elements of a GridBad layout are of equal size and are laid out using the squares of a grid.<\/p>\n

Question 36.
\nWhich Component subclass is used for drawing and painting?
\nAnswer:
\nCanvas<\/p>\n

Question 37.
\nWhat are the problems faced by Java programmers who don\u2019t use layout managers?
\nAnswer:
\nWithout layout managers, Java programmers are faced with determining how their GUI will be displayed across multiple windowing systems and finding a common sizing and positioning that will work within the constraints imposed by each windowing system.<\/p>\n

Question 38.
\nWhat is Double Buffering?
\nAnswer:
\nDouble Buffering is a technique used to achieve smooth animations in Canvases or Panels. It is memory and CPU-consuming but is unavoidable as soon as you want to animate something. This technique is not applicable for native components like Buttons, Lists, etc… Since the redisplay is handled by the underlying toolkits (Motif or MsWin).<\/p>\n

To handle double buffering, one must first draw the widget\u2019s contents in an off\u00acscreen image and then transfer the contents of the image to the visible window.<\/p>\n

class DoubleBufferedcanvas extends Canvas {\r\n\r\n    public void update(Graphics g) {\r\n    Graphics offgc;\r\n    Image offscreen = null;\r\n    Dimension d = size( );\r\n\r\n    \/\/ create the offscreen buffer and associated Graphics\r\n    offscreen = createimage(d.width, d.height);\r\n    offgc = off screen. getGraphics( );\r\n    \/\/clear the exposed area\r\n    offgc.setColor(getBackground( ));\r\n    offgc.fillRect(0, 0, d.width, d.height);\r\n    offgc.setColor(getForeground( ));\r\n    \/\/ do normal redraw\r\n    paint(offgc);\r\n    \/\/ transfer offscreen to window\r\n    g.drawimage(offscreen, 0, 0, this);\r\n   }\r\n}\r\n<\/pre>\n
This method has one major drawback: it copies the whole buffer each time an update is required. This may consume a lot of time and CPU for a large window Hopefully, graphics contains a definition of the area that has to be redrawn: it is called clip region. The region, in Java Graphics, has two meanings:<\/p>\n
    \n
  1. It tells which part needs to be drawn<\/li>\n
  2. It clips drawing orders inside this area that means if you draw outside the clip region, nothing will appear.<\/li>\n<\/ol>\n
    Using clip regions, we can define an optimized version of the DoubleBufferedCanvas:<\/p>\n
    class OptimizedDoubleBufferedCanvas extends canvas {\r\n\r\n   public void update(Graphics g) {\r\n   Graphics offgc;\r\n   Image offscreen = null;\r\n   Rectangle box = g.getclipRect( );\r\n\r\n   \/\/ create the offscreen buffer and associated Graphics\r\n   offscreen = createimagefbox.width, box.height);\r\n   offgc = offscreen.getGraphics( ));\r\n   \/\/ clear the exposed area\r\n   offgc.setcolor(getBackg round( ));\r\n   offgc.fillRect(0, 0, box.width, box.height);\r\n   offgc.setcolor(getForeground( ));\r\n   \/\/ do normal redraw\r\n   offgc.translateC-box.x, -box.y);\r\n   paint(offgc);\r\n   \/\/ transfer offscreen to window\r\n   g.drawlmage(offscreen, box.x, box.y, this);\r\n   }\r\n}<\/pre>\n
    Question 39.
    \nWhat is the preferred size of a component?
    \nAnswer:
    \nThe preferred size of a component is the minimum component size that will allow the component to display normally.<\/p>\n
    Question 40.
    \nWhat method is used to specify a container\u2019s layout?
    \nAnswer:
    \nThe setLayout( ) method is used to specify a container\u2019s layout.<\/p>\n
    Question 41.
    \nWhich containers use a FlowLayout as their default layout?
    \nAnswer:
    \nThe Panel and Applet classes use the FlowLayout as their default layout.<\/p>\n
    Question 42.
    \nName Component subclasses that support painting.
    \nAnswer:
    \nThe Canvas, Frame, Panel, and Applet classes support painting.<\/p>\n
    Question 43.
    \nCan an anonymous class be declared as implementing an interface and extending a class?
    \nAnswer:
    \nAn anonymous class may implement an interface or extend a superclass, but may not be declared to do both.<\/p>\n
    Question 44.
    \nWhich Container method is used to cause a container to be laid out and redisplayed?
    \nAnswer:
    \nvalidate( )<\/p>\n
    Question 45.
    \nWhat is the difference between a Window and a Frame?
    \nAnswer:
    \nThe Frame class extends Window to define the main application window that can have a menu bar.<\/p>\n
    Question 46.
    \nWhat do heavy-weight components mean?
    \nAnswer:
    \nHeavyweight components like Abstract Window Toolkit (AWT), depending on the local windowing toolkit. For example, java.awt.The button is a heavy-weight component, when it is running on the Java platform for Unix platform, it maps to a real Motif button. In this relationship, the Motif button is called the peer to the java.awt.Button. If you create two Buttons, two peers and hence two Motif Buttons are also created. The Java platform communicates with the Motif Buttons using the Java Native Interface. For each and every component added to the application, there is an additional overhead tied to the local windowing system, which is why these components are called heavyweight.<\/p>\n
    Question 47.
    \nHow are the elements of a GridBagLayout organized?
    \nAnswer:
    \nThe elements of a GridBagLayout are organized according to a grid. However, the elements are of different sizes and may occupy more than one row or column of the grid. In addition, the rows and columns may have different sizes.<\/p>\n
    Question 48.
    \nWhat advantage do Java\u2019s layout managers provide over traditional windowing systems?
    \nAnswer:
    \nJava uses layout managers to layout components in a consistent manner across all windowing platforms. Since Java\u2019s layout managers aren\u2019t tied to absolute sizing and positioning, they are able to accommodate platform-specific differences among windowing systems<\/p>\n
    Question 49.
    \nWhat is the difference between the paint( ) and repaint( ) methods?
    \nAnswer:
    \nThe paint( ) method supports painting via a Graphics object. The repaint( ) method is used to cause paint( ) to be invoked by the AWT painting thread.<\/p>\n
    Question 50.
    \nName Container classes.
    \nAnswer:
    \nWindow, Frame, Dialog, FileDialog, Panel, Applet, or ScrollPane<\/p>\n
    Question 51.
    \nWhat is the difference between a Scrollbar and a ScrollPane?
    \nAnswer:
    \nA Scrollbar is a Component, but not a Container. A ScrollPane is a Container. A ScrollPane handles its own events and performs its own scrolling.<\/p>\n
    Question 52.
    \nWhat is a Container in a GUI?
    \nAnswer:
    \nA Container contains and arranges other components (including other containers) through the use of layout managers, which use specific layout policies to determine where components should go as a function of the size of the container.<\/p>\n
    Question 53.
    \nHow to add a menu shortcut to menu items?
    \nAnswer:
    \nIf you have a button instance called the about the button, you may add a menu shortcut by calling the about button.setMnemonic(A.\u2019), so the user may be able to use Alt+A to click the button.<\/p>\n
    Question 54.
    \nWhat is the difference between Swing and AWT components?
    \nAnswer:
    \nAWT components are heavy-weight, whereas Swing components are lightweight. Heavyweight components depend on the local windowing toolkit. For example, java.awt.The button is a heavy-weight component, when it is running on the Java platform for Unix platform, it maps to a real Motif button.<\/p>\n
    Question 55.
    \nWhat is meant by controls and what are the different types of controls?
    \nAnswer:
    \nControls are components that allow a user to interact with your application. The AWT supports the following types of controls:
    \nLabels, Pushbuttons, Checkboxes, Choice lists, Lists, Scroll bars, Text components These controls are subclasses of Component.<\/p>\n
    Question 56.
    \nHow can we get all public methods of an object dynamically?
    \nAnswer:
    \nBy using
    \nget methods( ): It returns an array of method objects corresponding to the methods of this class.
    \ngetFields( ): It returns an array of Filed objects corresponding to the Fields(variables) of this class.
    \ngetConstructors( ): It returns an array of constructor objects corresponding to public constructors of this class.<\/p>\n
    Question 57.
    \nWhat is the SubClass of Text component Class?
    \nAnswer:
    \nTextField and TextArea<\/p>\n
    Question 58.
    \nWhich method of the Component class is used to set the position and the size of a component?
    \nAnswer:
    \nsetBounds( )<\/p>\n
    Question 59.
    \nWhich TextComponent method is used to set A TextComponent to the read\u00aconly state?
    \nAnswer:
    \nsetEditable( )<\/p>\n
    Question 60.
    \nHow can the Checkbox class be used to create a radio button?
    \nAnswer:
    \nBy associating Checkbox objects with a CheckboxGroup.<\/p>\n
    Question 61.
    \nWhat Checkbox method allows you to tell if a Checkbox is checked?
    \nAnswer:
    \ngetState( )<\/p>\n
    Question 62.
    \nWhich Component method is used to access a component\u2019s immediate Container?
    \nAnswer:
    \ngetParent( )<\/p>\n
    Question 63.
    \nWhat methods are used to get and set the text label displayed by a Button object?
    \nAnswer:
    \ngetLabel( ) and setLabel( )<\/p>\n
    Question 64.
    \nWhat is the difference between a Choice and a List?
    \nAnswer:
    \nA Choice is displayed in a compact form that requires you to pull it down to see the list of available choices. Only one item may be selected from a Choice.
    \nA-List may be displayed in such a way that several List items are visible. A-List supports the selection of one or more List items.<\/p>\n
    Question 65.
    \nWhich Container method is used to cause a container to be laid out and redisplayed?
    \nAnswer:
    \nvalidate( )<\/p>\n
    Question 66.
    \nWhat is the difference between a Scrollbar and a Scrollpane?
    \nAnswer:
    \nA Scrollbar is a Component, but not a Container. A Scrollpane is a Container and handles its own events and performs its own scrolling.<\/p>\n
    Question 67.
    \nWhich Component subclass is used for drawing and painting?
    \nAnswer:
    \nCanvas.<\/p>\n
    Question 68.
    \nWhich method is used to set the text of a Label object?
    \nAnswer:
    \nsetText( )<\/p>\n
    Question 69.
    \nWhich method will cause a Frame to be displayed?
    \nAnswer:<\/p>\n
    a) . show( )
    \nb) . setVisible( )<\/p>\n
    Question 70.
    \nAll the component classes and container classes are derived from
    \nclass.
    \nAnswer:
    \nObject.<\/p>\n
    Question 71.
    \nWhich method of the container class can be used to add components to a Panel?
    \nAnswer:
    \nadd ( ) method.<\/p>\n
    Question 72.
    \nWhat are the subclasses of the Container class?
    \nAnswer:
    \nThe Container class has three major subclasses. They are:
    \nWindow, Panel, ScrollPane<\/p>\n
    Question 73.
    \nCan the Choice component allow multiple selections?
    \nAnswer:
    \nNo<\/p>\n
    Question 74.
    \nWhich components are used to get text input from the user?
    \nAnswer:
    \nTextField and TextArea.<\/p>\n
    Question 75.
    \nWhich object is needed to group Checkboxes to make them exclusive?
    \nAnswer:
    \nCheckboxGroup.<\/p>\n
    Question 76.
    \nWhat are the types of Checkboxes and what is the difference between them?
    \nAnswer:
    \nJava supports two types of Checkboxes. They are:
    \nExclusive and Non-exclusive.
    \nIn the case of exclusive Checkboxes,<\/strong> only one among a group of items can be selected at a time. If an item from the group is selected, the checkbox currently checked is deselected and the new selection is highlighted. The exclusive Checkboxes are also called Radio buttons.
    \nThe non-exclusive checkboxes<\/strong> are not grouped together and each one can be selected independent of the other.<\/p>\n
    Question 77.
    \nWhat is a Layout Manager and what are the different Layout Managers available in java.awt and what is the default layout manager for the panel and the panel subclasses?
    \nAnswer:
    \nA layout manager is an object that is used to organize components in a container.<\/p>\n
    Question 78.
    \nWhat are the different layouts available in java.awt :
    \nAnswer:
    \nFlowLayout, BorderLayout, CardLayout, GridLayout, GridBag Layout. The default Layout Manager of Panel and Panel sub classes is FlowLayout\u201d.<\/p>\n
    Question 79.
    \nCan I exert control over the size and placement of components in my interface?
    \nAnswer:
    \nYes.<\/p>\n
    Question 80.
    \nCan I add the same component to more than one container?
    \nAnswer:
    \nNo. Adding a component to a container automatically removes it from any previous parent (container).<\/p>\n
    Question 81.
    \nHow do I specify where a window is to be placed?
    \nAnswer:
    \nUse setBounds, setSize, or setLocation methods to implement this.
    \nsetBounds(int x, int y, int width, int height)
    \nsetBounds(Rectangle r)
    \nsetSize(int width, int height)
    \nsetSize(Dimension d)
    \nsetLocation(int x, int y)
    \nsetLocation(Point p)<\/p>\n
    Question 82.
    \nHow can we create a borderless window?
    \nAnswer:
    \nCreate an instance of the Window class, give it a size, and show it on the screen.
    \nEx. Frame obj =…………………..
    \nWindow WA = new Window(obj);
    \nWA.setLayout(new FlowLayoutO);
    \nWA.add(new Button(\u201cOK\u201d));
    \nWA.getBounds(50,50,200,200);
    \nWA.show( );<\/p>\n
    Question 83.
    \nCan I create a non-resizable window? If so, how?
    \nAnswer:
    \nYes. By using setResizable( ) method in class Frame.<\/p>\n
    Question 84.
    \nWhat is the default Layout Manager for the Window and Window subclasses (Frame, Dialog)?
    \nAnswer:
    \nBorderLayout( )<\/p>\n
    Question 85.
    \nWhich containers use a BorderLayout as their default layout?
    \nAnswer:
    \nThe Window, Frame, and Dialog classes use a BorderLayout as their default layout.<\/p>\n
    Question 86.
    \nWhich containers use a FlowLayout as their default layout?
    \nAnswer:
    \nThe Panel and the Applet classes use the FlowLayout as their default layout.<\/p>\n
    Question 87.
    \nWhat is the preferred size of a component?
    \nAnswer:
    \nThe preferred size of a component size will allow the component to display normally.<\/p>\n
    Question 88.
    \nWhich method is a method to set the layout of a container?
    \nAnswer:
    \nsetLayout( )<\/p>\n
    Question 89.
    \nWhich method returns the preferred size of a component?
    \nAnswer:
    \ngetPreferredSize( )<\/p>\n
    Question 90.
    \nWhich layout should you use to organize the components of a container in a tabular form?
    \nAnswer:
    \nGridLayout<\/p>\n
    Question 91.
    \nWhat are the default layouts for an applet, a frame, and a panel?
    \nAnswer:
    \nFor an applet and a panel, Flow layout is the default layout, whereas Border layout is the default layout for a frame.<\/p>\n
    Question 92.
    \nHow can you change the current layout manager for a container?
    \nAnswer:
    \nBy using setLayout( ) method.<\/p>\n
    Question 93.
    \nWhich is the default layout for Applet?
    \nAnswer:
    \nThe default layout manager for an Applet is FlowLayout, and The FlowLayout manager attempts to honor the preferred size of any components.<\/p>\n
    Question 94.
    \nWhich method does display the messages whenever there is an item selection or deselection of the CheckboxMenuItem menu?
    \nAnswer:
    \nitemStateChanged method.<\/p>\n
    Question 95.
    \nWhich is a dual state menu item?
    \nAnswer:
    \nCheckboxMenuItem.<\/p>\n
    Question 96.
    \nWhich container may contain a menu bar?
    \nAnswer:
    \nFrame<\/p>\n
    Question 97.
    \nWhat is the difference between a Menultem and a CheckboxMenuItem?
    \nAnswer:
    \nThe CheckboxMenuItem class extends the Menultem class to support a menu item that may be checked or unchecked.<\/p>\n
    Question 98.
    \nWhat is the correct ordering for the import, class, and package declarations when found in a single file?
    \nAnswer:
    \npackage, import, class<\/p>\n
    Question 99.
    \nWhat is the parameter specification for the public static void main method?
    \nAnswer:<\/p>\n
      \n
    1. String args [ ]<\/li>\n
    2. String [ ] args<\/li>\n<\/ol>\n
      Question 100.
      \nWhat is the sweep and paint algorithm?
      \nAnswer:
      \nThe painting algorithm takes as input a source image and a list of brush sizes, sweep algo is that it computes the arrangement of n lines in the plane … a correct algorithm,<\/p>\n
      Question 101.
      \nWhat are the component and container classes?
      \nAnswer:
      \nA component is a graphical object. A few examples of components are Button, Canvas, Checkbox, Choice, etc.<\/p>\n
      Question 102.
      \nExplain the purpose of invalidating and validate methods.
      \nAnswer:
      \nThe invalidate method is called a side effect of adding or deleting some component. Calling invalidates ( ) is however the first step of processing a COMPONENTJtESIZED event.<\/p>\n
      Question 103.
      \nWhat are AWT peers? When are peers created and destroyed?
      \nAnswer:
      \nA Component is associated with a standard AWT button object, a peer object (hidden button object internal to the native GUI), and an interfacing button object constructed per the native GUI.<\/p>\n
      Question 104.
      \nShow with an example the usage of the FileDialog object.
      \nAnswer:
      \nclass FileDialog extends from Dialog class. It is used to display a dialog window from which the user can select a file.<\/p>\n
      Question 105.
      \nExplain the purposes of the component\u2019s request focus method.
      \nAnswer:
      \nThe purpose of the request focus( ) is to get the focus on the particular component and also on the window that contains the component.<\/p>\n
      Question 106.
      \nWhich method of the Component class is used to set the position and size of a component?
      \nAnswer:
      \nThe methods are: set maximum size(Dimension maximum size) Sets the maximum size of this component to a constant value.<\/p>\n
      Question 107.
      \nWhat interface is extended by AWT event listeners?
      \nAnswer:
      \nThe java. util.EventListener interface is extended by all the AWT event listeners.<\/p>\n
      Question 108.
      \nWhat is the paint method? What should we put in the paint method? When is it invoked?
      \nAnswer:
      \nThe AWT uses a Callback mechanism for painting which is the same for heavyweight and lightweight components.<\/p>\n
      Question 109.
      \nWhat is the purpose of the repaint method? When should we use the repaint method?
      \nAnswer:
      \nrepaint( ) requests can erase and redraw (update) after a small time delay. When you invoke repaint( )<\/p>\n
      Question 110.
      \nExplain the use of the update method. When is it invoked?
      \nAnswer:
      \nAn update method is called on calling the repaint method. The default implementation of the update( ) method clears the screen and calls the paint( ) method.<\/p>\n
      Question 111.
      \nHow does the XOR drawing mode work? What are the properties of XOR j drawing?
      \nAnswer:
      \nsetXORMode(Color cl) sets the paint mode of this graphics context to alternate between a graphics context\u2019s current color and the new specified color.<\/p>\n
      Question 112.
      \nExplain how to load an image from the net into my applet.
      \nAnswer:
      \nprivate Imagelcon image;
      \ninside the init method
      \nimage = new ImageIcon(new URL(http:\/\/www.xyz.gif));<\/p>\n
      Question 113.
      \nExplain how to load an image from a file in a java application.
      \nAnswer:
      \nImagelcon icon = createImageIcon(\u201cimages\/xyz.gif\u2019, \u201ctext string\u201d);<\/p>\n
      Question 114.
      \nWhat is the difference between a Window and a Frame?
      \nAnswer:
      \nA frame is a resizable, movable window with a title bar and a close button. Usually, it contains Panels. It\u2019s derived from a window and has a BorderLayout by default.<\/p>\n
      Question 115.
      \nExplain how to draw text over a background image.
      \nAnswer:
      \nBufferedlmage img = ImageIO.read(new File(\u201cxxx\u201d)); \/\/ xxx is the path TextOnBackground test = new TextOnBackground(img);<\/p>\n
      Question 116.
      \nDefine canvas?
      \nAnswer:
      \nIt is a simple drawing surface that is used for painting images or to perform other graphical operations.<\/p>\n
       <\/p>\n","protected":false},"excerpt":{"rendered":"
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