# Java - Insertion Sort

We often using sorting algorithm to sort numbers and strings. Also we have many sorting algorithms. I have explained here on how insertion sort algorithm works using Java programming Language. Look at the yellow color high lighting section on output to understand how algorithm works after each iteration.

The complete program and test run output are given below:

## Source Code

import java.io.*;

class InsertionSort {

public static void main(String[] args) {

String inpstring = "";

try

{

System.out.print("Enter a Number Elements for INSERTION SORT:");

long max = Long.parseLong(inpstring);

long[] arrElements = new long[100];

for (int i = 0; i < max; i++)

{

System.out.print("Enter [" + (i + 1) + "] Element: ");

arrElements[i] = Long.parseLong(inpstring);

}

for(int i = 1; i < max; i++)

{

int j = i;

while(j > 0)

{

if(arrElements[j-1] > arrElements[j])

{

long temp = arrElements[j - 1];

arrElements[j - 1] = arrElements[j];

arrElements[j] = temp;

j--;

}

else

break;

}

System.out.print("After iteration " + i + ": ");

for(int k = 0; k < max; k++)

System.out.print(arrElements[k] + " ");

System.out.println("/*** " + i + " numbers from the begining of the array are input and they are sorted ***/");

}

System.out.println("The numbers in ascending orders are given below:");

for (int i = 0; i < max; i++)

{

System.out.println(arrElements[i]);

}

}

catch (Exception e)

{

e.printStackTrace();

}

}

}

## Output

C:\Java\Samples>javac InsertionSort.java

C:\Java\Samples>java InsertionSort

Program for Ascending order of Numeric Values using INSERTION SORT

Enter the total number of elements: 8

Enter [1] element: 80

Enter [2] element: 60

Enter [3] element: 40

Enter [4] element: 20

Enter [5] element: 10

Enter [6] element: 30

Enter [7] element: 50

Enter [8] element: 70

Before Sorting   : 80 60 40 20 10 30 50 70

After iteration 1: 60 80 40 20 10 30 50 70

After iteration 2: 40 60 80 20 10 30 50 70

After iteration 3: 20 40 60 80 10 30 50 70

After iteration 4: 10 20 40 60 80 30 50 70

After iteration 5: 10 20 30 40 60 80 50 70

After iteration 6: 10 20 30 40 50 60 80 70

After iteration 7: 10 20 30 40 50 60 70 80

The numbers in ascending orders are given below:

Sorted [1] element: 10

Sorted [2] element: 20

Sorted [3] element: 30

Sorted [4] element: 40

Sorted [5] element: 50

Sorted [6] element: 60

Sorted [7] element: 70

Sorted [8] element: 80