How to find the smallest number in an array java: In the previous article, we have seen Java Program to Find the Third Largest Number in an Array
In this article we are going to see how we can find the third smallest element in an array.
Java Program to Find the Third Smallest Number in an Array
How to find smallest number in array java: Array is a data structure which stores a fixed size sequential collection of values of single type. Where with every array elements/values memory location is associated. Each array elements have it’s own index where array index starts from 0.
In Array set of variables referenced by a single variable name and it’s array index position. It is also called as a container object which contains elements of similar type.
Declaration of an array:
dataType[] arrayName; (or) //Declaring an array dataType []arrayName; (or) dataType arr[];
Instantiation of an Array:
arrayName = new datatype[size]; //Allocating memory to array
Combining both Statements in One:
dataType[] arrayName = new dataType[size] //Declaring and Instantiating array
Initialization of an Array:
arrayName[index-0]= arrayElement1 //Initializing the array ... arrayName[index-s]= arrayElementS
Combining all Statements in One:
dataType arrayName[ ]={e1,e2,e3}; //declaration, instantiation and initialization
Let’s see different ways to find the third smallest element in an array.
Method-1: Java Program to Find the Third Smallest Number in an Array By Comparing Elements
Approach:
- Take an array with elements in it.
- Print the array elements.
- Create a variable and store the first element of the array in it.
- Compare the variable with the whole array to find and store the Smallest element.
- Repeat the above step for the array elements except the Smallest element.
- Repeat the steps again to find out the third smallest element and print it.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
// Creating the array
int arr[] = {12, 2, 34, 20, 54, 6};
// Prints the array elements
printArray(arr);
// Initializing the first element of the array to Small
int small=arr[0];
// Compares all the element to find out the Smallest one
for(int i:arr)
{
if(small>i)
small=i;
}
// Initializing the first element of the array to secondSmall
int secondSmall=arr[0];
// Compares all the element to find out the second Smallest one
for(int i:arr)
{
if(secondSmall>i&&i!=small)
secondSmall=i;
}
int thirdSmall=arr[0];
// Compares all the element to find out the third Smallest one
for(int i:arr)
{
if(thirdSmall>i&&i!=small&&i!=secondSmall)
thirdSmall=i;
}
// Prints the third smallest element
System.out.println("The third smallest element of the array is: "+thirdSmall);
}
// Function to print the array
static void printArray(int arr[])
{
System.out.println("The array elements are");
for(int i = 0; i < arr.length ; i++)
System.out.print(arr[i]+" ");
System.out.println();
}
}
Output: The array elements are 12 2 34 20 54 6 The third smallest element of the array is: 12
Method-2: Java Program to Find the Third Smallest Number in an Array By Using Sorting
Approach:
- Take an array with elements in it.
- Print the array elements.
- Use function
Arrays.sort()to sort the array in ascending order. - Print the third element.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
// Creating the array
Integer arr[] = {12, 2, 34, 20, 54, 6};
// Prints the array elements
printArray(arr);
// Sorts the array in ascending order
Arrays.sort(arr);
// Prints the third smallest element
System.out.println("The third smallest element of the array is: "+arr[2]);
}
// Function to print the array
static void printArray(Integer arr[])
{
System.out.println("The array elements are");
for(int i = 0; i < arr.length ; i++)
System.out.print(arr[i]+" ");
System.out.println();
}
}
Output: The array elements are 12 2 34 20 54 6 The third smallest element of the array is: 12
Method-3: Java Program to Find the Third Smallest Number in an Array By Using ArrayList and collections
Approach:
- Take an array with elements in it.
- Print the array elements.
- Convert the array elements into a list.
- Use the
Collection.sortfunction to sort the list in ascending order. - Print the third element.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
// Creating the array
Integer arr[] = {12, 2, 34, 20, 54, 6};
// Prints the array elements
printArray(arr);
// Converts the array into a list
List<Integer> list=Arrays.asList(arr);
// Sorts the array in ascending order
Collections.sort(list);
// Prints the third smallest element
System.out.println("The third smallest element of the array is: "+list.get(2));
}
// Function to print the array
static void printArray(Integer arr[])
{
System.out.println("The array elements are");
for(int i = 0; i < arr.length ; i++)
System.out.print(arr[i]+" ");
System.out.println();
}
}
Output: The array elements are 12 2 34 20 54 6 The third smallest element of the array is: 12
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