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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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Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
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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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