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Program: How to copy range of elements from an array?


Java Arrays class provides few utility methods. One of the utility method Arrays.copyOfRange() helps us to copy range of object from existing array to new array. Below example shows how to copy range of object to new array.

package com.java2novice.arrays;

import java.util.Arrays;

public class MyArrayRangeCopy {
        public static void main(String a[]){
                int[] myArr = {2,4,2,4,5,6,3};
                System.out.println("My array elements:\n");
                for(int num:myArr){
                        System.out.print(num+"  ");
                int[] newArr = Arrays.copyOfRange(myArr, 1, 4);
                System.out.println("\nMy new array elements:\n");
                for(int num:newArr){
                        System.out.print(num+"  ");

My array elements:

2  4  2  4  5  6  3  
My new array elements:

4  2  4  
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wait Vs sleep methods
sleep(): It is a static method on Thread class. It makes the current thread into the "Not Runnable" state for specified amount of time. During this time, the thread keeps the lock (monitors) it has acquired.

wait(): It is a method on Object class. It makes the current thread into the "Not Runnable" state. Wait is called on a object, not a thread. Before calling wait() method, the object should be synchronized, means the object should be inside synchronized block. The call to wait() releases the acquired lock.
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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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