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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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Class, Constructor and Primitive data types
Class is a template for multiple objects with similar features and it is a blue print for objects. It defines a type of object according to the data the object can hold and the operations the object can perform. Constructor is a special kind of method that determines how an object is initialized when created. Primitive data types are 8 types and they are: byte, short, int, long, float, double, boolean, char.
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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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