JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Implement selection sort in java.


The selection sort is a combination of searching and sorting. During each pass, the unsorted element with the smallest (or largest) value is moved to its proper position in the array. The number of times the sort passes through the array is one less than the number of items in the array. In the selection sort, the inner loop finds the next smallest (or largest) value and the outer loop places that value into its proper location.

Selection Sort

Selection sort is not difficult to analyze compared to other sorting algorithms since none of the loops depend on the data in the array. Selecting the lowest element requires scanning all n elements (this takesn − 1 comparisons) and then swapping it into the first position. Finding the next lowest element requires scanning the remaining n − 1 elements and so on, for (n − 1) + (n − 2) + ... + 2 + 1 = n(n − 1) / 2 ∈ Θ(n2) comparisons. Each of these scans requires one swap for n − 1 elements.


package com.java2novice.algos;

public class MySelectionSort {

	public static int[] doSelectionSort(int[] arr){
		
	    for (int i = 0; i < arr.length - 1; i++)
	    {
	        int index = i;
	        for (int j = i + 1; j < arr.length; j++)
	            if (arr[j] < arr[index]) 
	                index = j;
	 
	        int smallerNumber = arr[index];  
	        arr[index] = arr[i];
	        arr[i] = smallerNumber;
	    }
	    return arr;
	}
	
	public static void main(String a[]){
		
		int[] arr1 = {10,34,2,56,7,67,88,42};
		int[] arr2 = doSelectionSort(arr1);
		for(int i:arr2){
			System.out.print(i);
			System.out.print(", ");
		}
	}
}

Output:
2, 7, 10, 34, 42, 56, 67, 88, 
<< Previous Program | Next Program >>

Java Sorting Algorithms Examples

  1. Implement bubble sort in java.
  2. Implement selection sort in java.
  3. Implement insertion sort in java.
  4. Implement quick sort in java.
  5. Implement merge sort in java.
Knowledge Centre
Purpose of garbage collection
The garbage collection process is to identify the objects which are no longer referenced or needed by a program so that their resources can be reclaimed and reused. These identified objects will be discarded.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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