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Program: How to copy array and increase size dynamically?


Java Arrays class provides few utility methods. One of the utility method Arrays.copyOf() helps us to create new array with new size and copy old arrays content to the new array at the same time. Below example shows how to copy an array and increase its size.

package com.java2novice.arrays;

import java.util.Arrays;

public class MyArrayCopy {
	public static void main(String a[]){
		int[] myArr = {2,4,2,4,5,6,3};
		System.out.println("Array size before copy: "+myArr.length);
		int[] newArr = Arrays.copyOf(myArr, 10);
		System.out.println("New array size after copying: "+newArr.length);

Array size before copy: 7
New array size after copying: 10
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Difference between while and do-while
The while statement verifies the condition before entering into the loop to see whether the next loop iteration should occur or not. The do-while statement executes the first iteration without checking the condition, it verifies the condition after finishing each iteration. The do-while statement will always execute the body of a loop at least once.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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