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/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package selectionsort; import java.util.Random; import java.util.Scanner; /** * * @author ADMIN */ public class SelectionSort { /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here Scanner sc = new Scanner(System.in); int n = InputNumberArray(); int[] array = RandomArray(n); PrintArray("The array:", array); SelectionSort(array); System.out.println(); PrintArray("Sorted array : ", array); } public static int InputNumberArray() { Scanner scanner = new Scanner(System.in); int size; while (true) { // Start an infinite loop to keep asking for input until a valid value is provided. try { System.out.println("Input Number of Array : "); size = Integer.parseInt(scanner.nextLine()); // Read the user's input and parse it as an integer. if (size > 0) { break; // if size > 0 , valid value and loop break } else { System.out.println("You have to input a positive number , Reinpiut : "); // iff size <= 0 , Display notice } } catch (NumberFormatException e) { System.out.println("Invalid value , Reinput : "); // if users input a special character , program will notice to users } } return size; } public static int[] RandomArray(int ArraySize) { int[] array = new int[ArraySize]; // Create a random object name random Random random = new Random(); for (int i = 0; i < ArraySize; i++) { array[i] = random.nextInt(ArraySize); } // loop use to random each element of array return array; } public static void PrintArray(String variable, int[] array) { System.out.print(variable); System.out.print("["); // loop use to accessed each element of array and display them for (int i = 0; i < array.length; i++) { System.out.print(array[i]); if (i < array.length - 1) { System.out.print(","); } }// print each element of the array System.out.print("]"); } /* Start from the first element and compare with each element of the array to find the min and return it to the correct position. Repeat with the remaining elements. */ public static void SelectionSort(int[] arr) { int n = arr.length; // Get the length of the array. for (int i = 0; i < n - 1; i++) { int minIndex = i; // Assume the first unsorted element is the minimum. // Find the minimum element in the unsorted part. for (int j = i + 1; j < n; j++) { if (arr[j] < arr[minIndex]) { minIndex = j; } } // Swap the minimum element with the first unsorted element. int temp = arr[minIndex]; arr[minIndex] = arr[i]; arr[i] = temp; } } }
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