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Insertion Sort Program in Java
This article covers a program in Java that sorts an array using insertion sort technique. In both the program given below, the size and array both are received by user at run-time of the program.
Note - If you're not aware about, how the insertion sort performs, then refer to Insertion Sort Algorithm and Example. Now let's create the program.
Insertion Sort in Java using for Loop
The question is, write a Java program to perform insertion sort based on an array of n elements. The program given below is its answer. This program is created without using function.
import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { int n, i, j, element; Scanner scan = new Scanner(System.in); System.out.print("Enter the Size of Array: "); n = scan.nextInt(); int[] arr = new int[n]; System.out.print("Enter " +n+ " Elements: "); for(i=0; i<n; i++) arr[i] = scan.nextInt(); for(i=1; i<n; i++) { element = arr[i]; for(j=(i-1); j>=0 && arr[j]>element; j--) arr[j+1] = arr[j]; arr[j+1] = element; } System.out.println("\nThe new sorted array is: "); for(i=0; i<n; i++) System.out.print(arr[i]+ " "); } }
The snapshot given below shows the sample run of above program with user input 6 as size and 6, 1, 5, 2, 4, 3 as six elements:
Insertion Sort in Java using while Loop
This is the same program as of previous, but created using while loop, instead of for.
import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { int n, i, j, element; Scanner scan = new Scanner(System.in); System.out.print("Enter the Size of Array: "); n = scan.nextInt(); int[] arr = new int[n]; System.out.print("Enter " +n+ " Elements: "); i=0; while(i<n) { arr[i] = scan.nextInt(); i++; } i=1; while(i<n) { element = arr[i]; j=i-1; while(j>=0 && arr[j]>element) { arr[j+1] = arr[j]; j--; } arr[j+1] = element; i++; } System.out.println("\nThe new sorted array is: "); i=0; while(i<n) { System.out.print(arr[i]+ " "); i++; } } }
Same Program in Other Languages
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