How to sort elements in Object Array in Java?

Declaration :

public static void sort(Object[] a)

1	public static void sort(Object[] a)

Explanation :

Purpose	The java.util.Arrays.sort(Object[]) method sorts the specified array of Objects into ascending order according to the natural ordering of its elements.
Parameters	a ===> This is the array to be sorted.
Return Value	This method does not return any value.
Exception	ClassCastException — if the array contains elements that are not mutually comparable (for example strings and integers).

Java Program : Example

Below example will explain java.util.Arrays.sort() method.

package com.c4learn;
import java.util.Arrays;
public class ArrayDemo {
	public static void main(String[] args) {
		// Initialize unsorted Object array
		Object obj[] = { 30, 10, 20 };
		// Print the Unsorted Array List
		System.out.println("The unsorted object array is:");
		for (Object num : obj) {
			System.out.println("Array Element is " + num);
		}
		// Sort the array
		Arrays.sort(obj);
		// Print the Sorted Array List
		System.out.println("The sorted Object array is:");
		for (Object num : obj) {
			System.out.println("Array Element is " + num);
		}
	}
}

package com.c4learn;

import java.util.Arrays;

public class ArrayDemo {

public static void main(String[] args) {

// Initialize unsorted Object array

Object obj[] = { 30, 10, 20 };

// Print the Unsorted Array List

System.out.println("The unsorted object array is:");

for (Object num : obj) {

System.out.println("Array Element is " + num);

}

// Sort the array

Arrays.sort(obj);

// Print the Sorted Array List

System.out.println("The sorted Object array is:");

for (Object num : obj) {

System.out.println("Array Element is " + num);

}

Output of Program :

The unsorted object array is:
Array Element is 30
Array Element is 10
Array Element is 20
The sorted Object array is:
Array Element is 10
Array Element is 20
Array Element is 30

The unsorted object array is:

Array Element is 30

Array Element is 10

Array Element is 20

The sorted Object array is:

Array Element is 10

Array Element is 20

Array Element is 30

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