Uncategorized

Selection Sort Java Program

Selection sort is a kind of sorting mechanism where every element is compared with the every other element to sort the elements.
The following programs performs a selection sort on integers and also also calculates number of iteration required for sorting entire array. And also it simulates how the array is actually sorted on each iteration.

 


package sorting;

import java.util.Arrays;

public class SelectionSort {

public static void main(String[] rawInput) {

int numberOfIterations = 0;
int length = rawInput.length;
int input[] = new int[length];
for (int k = 0; k < length; k++) {
input[k] = Integer.parseInt(rawInput[k]);
}

System.out.println("Raw input" + Arrays.toString(input));

if (length == 0) {
System.out.println("Invalid input ");
} else {
for (int i = 0; i < length; i++) {
numberOfIterations++;
// iterate the rest of the array
for (int j = i; j input[j]) {
int temp = input[i];
input[i] = input[j];
input[j] = temp;
System.out.println(Arrays.toString(input));
}

}

}
}

System.out.println("after sorting" + Arrays.toString(input));
System.out.println("Total Number of iterations:" + numberOfIterations);

}

}

If we run the above program with following input,
Raw input[9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
[8, 9, 7, 6, 5, 4, 3, 2, 1, 0]
[7, 9, 8, 6, 5, 4, 3, 2, 1, 0]
[6, 9, 8, 7, 5, 4, 3, 2, 1, 0]
[5, 9, 8, 7, 6, 4, 3, 2, 1, 0]
[4, 9, 8, 7, 6, 5, 3, 2, 1, 0]
[3, 9, 8, 7, 6, 5, 4, 2, 1, 0]
[2, 9, 8, 7, 6, 5, 4, 3, 1, 0]
[1, 9, 8, 7, 6, 5, 4, 3, 2, 0]
[0, 9, 8, 7, 6, 5, 4, 3, 2, 1]
[0, 8, 9, 7, 6, 5, 4, 3, 2, 1]
[0, 7, 9, 8, 6, 5, 4, 3, 2, 1]
[0, 6, 9, 8, 7, 5, 4, 3, 2, 1]
[0, 5, 9, 8, 7, 6, 4, 3, 2, 1]
[0, 4, 9, 8, 7, 6, 5, 3, 2, 1]
[0, 3, 9, 8, 7, 6, 5, 4, 2, 1]
[0, 2, 9, 8, 7, 6, 5, 4, 3, 1]
[0, 1, 9, 8, 7, 6, 5, 4, 3, 2]
[0, 1, 8, 9, 7, 6, 5, 4, 3, 2]
[0, 1, 7, 9, 8, 6, 5, 4, 3, 2]
[0, 1, 6, 9, 8, 7, 5, 4, 3, 2]
[0, 1, 5, 9, 8, 7, 6, 4, 3, 2]
[0, 1, 4, 9, 8, 7, 6, 5, 3, 2]
[0, 1, 3, 9, 8, 7, 6, 5, 4, 2]
[0, 1, 2, 9, 8, 7, 6, 5, 4, 3]
[0, 1, 2, 8, 9, 7, 6, 5, 4, 3]
[0, 1, 2, 7, 9, 8, 6, 5, 4, 3]
[0, 1, 2, 6, 9, 8, 7, 5, 4, 3]
[0, 1, 2, 5, 9, 8, 7, 6, 4, 3]
[0, 1, 2, 4, 9, 8, 7, 6, 5, 3]
[0, 1, 2, 3, 9, 8, 7, 6, 5, 4]
[0, 1, 2, 3, 8, 9, 7, 6, 5, 4]
[0, 1, 2, 3, 7, 9, 8, 6, 5, 4]
[0, 1, 2, 3, 6, 9, 8, 7, 5, 4]
[0, 1, 2, 3, 5, 9, 8, 7, 6, 4]
[0, 1, 2, 3, 4, 9, 8, 7, 6, 5]
[0, 1, 2, 3, 4, 8, 9, 7, 6, 5]
[0, 1, 2, 3, 4, 7, 9, 8, 6, 5]
[0, 1, 2, 3, 4, 6, 9, 8, 7, 5]
[0, 1, 2, 3, 4, 5, 9, 8, 7, 6]
[0, 1, 2, 3, 4, 5, 8, 9, 7, 6]
[0, 1, 2, 3, 4, 5, 7, 9, 8, 6]
[0, 1, 2, 3, 4, 5, 6, 9, 8, 7]
[0, 1, 2, 3, 4, 5, 6, 8, 9, 7]
[0, 1, 2, 3, 4, 5, 6, 7, 9, 8]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
after sorting[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Total Number of iterations:65

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s