How To Use The rt() Method In Java

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The built-in java.util.Arrays class has a method called sort() which can be used to sort an array in-place.

Syntax

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If starting_index and ending_index are not specified, the whole array is sorted.

Code

The following code snippet demonstrates how Arrays.sort() can be used to sort an integer array:

import java.util.Arrays; class Program { public static void main( String args[] ) { int [] arr = {5, -2, 23, 7, 87, -42, 509}; System.out.println("The original array is: "); for (int num: arr) { System.out.print(num + " "); } Arrays.sort(arr); System.out.println("\nThe sorted array is: "); for (int num: arr) { System.out.print(num + " "); } } }Run

The code snippet below uses the optional starting and ending indexes to sort the array within the specified bounds only:

import java.util.Arrays; class Program { public static void main( String args[] ) { int [] arr = {5, -2, 23, 7, 87, -42, 509}; System.out.println("The original array is: "); for (int num: arr) { System.out.print(num + " "); } Arrays.sort(arr, 3, 6); System.out.println("\nThe sorted array (from position 3 to 6) is: "); for (int num: arr) { System.out.print(num + " "); } }}Run

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