How to copy one array to another in java: In the previous article, we have seen Java Program to Find all the Leaders in the Array
In this article we are going to see how we can copy one array to another.
Java Program to Copy an Array to Another Array
Java copy array to another: 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 copy one array to another.
- By Using Variable Assignment Method
- By Copying Elements Individually
- By Using Clone Method
- By Using Arrays.copy( ) Method
- By Using Arrays.copyOf( ) Method
- By Using Arrays.copyOfRange( ) Method
Method-1: Java Program to Copy an Array to Another Array By Using Variable Assignment Method
Approach:
- Create an array.
- Create another array and assign the previous array to it.
- Display both the arrays.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
//Original array
int arr[] = {12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68,10,20,30};
// Copied th original array
int copyArray[] = arr;
// Printing both the arrays
System.out.println("Original Array : "+Arrays.toString(arr));
System.out.println("Copy Array : "+Arrays.toString(copyArray));
}
}
Output: Original Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30] Copy Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30]
Method-2: Java Program to Copy an Array to Another Array By Copying Elements Individually
Approach:
- Create two arrays of same size.
- Use a for loop to copy each element
- Display both arrays.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
//Original array
int arr[] = {12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68,10,20,30};
// Creating the second array of same size
int copyArray[] = new int[arr.length];
// Copying each element from the original array
for(int i=0;i<arr.length;i++)
{
copyArray[i] = arr[i];
}
// Printing both the arrays
System.out.println("Original Array : "+Arrays.toString(arr));
System.out.println("Copy Array : "+Arrays.toString(copyArray));
}
}
Output: Original Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30] Copy Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30]
Method-3: Java Program to Copy an Array to Another Array By Using Clone Method
Approach:
- Create an array.
- Create another array and clone the original array to it.
- Display both the arrays.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
//Original array
int arr[] = {12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68,10,20,30};
// Creating the second array by cloning the original array
int copyArray[] = arr.clone();
// Printing both the arrays
System.out.println("Original Array : "+Arrays.toString(arr));
System.out.println("Copy Array : "+Arrays.toString(copyArray));
}
}
Output: Original Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30] Copy Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30]
Method-4: Java Program to Copy an Array to Another Array By Using Arrays.copy( ) Method
Approach:
- Create two arrays of same size.
- Use
Arrays.copy( ) - Display both arrays.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
//Original array
int arr[] = {12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68,10,20,30};
// Creating the second array of same size
int copyArray[] = new int[arr.length];
// Copying array using arraycopy()
System.arraycopy(arr, 0, copyArray, 0, arr.length);
// Printing both the arrays
System.out.println("Original Array : "+Arrays.toString(arr));
System.out.println("Copy Array : "+Arrays.toString(copyArray));
}
}
Output: Original Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30] Copy Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30]
Method-5: Java Program to Copy an Array to Another Array By Using Arrays.copyOf( ) Method
Approach:
- Create an array.
- Create another array and use
Arrays.copyOf( )to copy all elements. - Display both the arrays.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
//Original array
int arr[] = {12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68,10,20,30};
// Creating the second array and copying elements
int copyArray[] = Arrays.copyOf(arr,arr.length);
// Printing both the arrays
System.out.println("Original Array : "+Arrays.toString(arr));
System.out.println("Copy Array : "+Arrays.toString(copyArray));
}
}
Output: Original Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30] Copy Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30]
Method-6: Java Program to Copy an Array to Another Array By Using Arrays.copyOfRange( ) Method
Approach:
- Create an array.
- Create another array and use
Arrays.copyOfRange( )to copy all elements. - Display both the arrays.
Program:
import java.util.*;
public class Main
{
public static void main(String args[])
{
//Original array
int arr[] = {12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68,10,20,30};
// Creating the second array and copying elements
int copyArray[] = Arrays.copyOfRange(arr,0,arr.length);
// Printing both the arrays
System.out.println("Original Array : "+Arrays.toString(arr));
System.out.println("Copy Array : "+Arrays.toString(copyArray));
}
}
Output: Original Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30] Copy Array : [12, 22, 34, 22, 54, 6, 52, 8, 9, 34, 54, 68, 10, 20, 30]
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