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POselection sort algorithm using the array in java
 

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    <p>When the program runs, it asks you to enter a product name and price, and then whenever you press -1 it will be stopped and display a list of the entered product and price. However, the problem is I wrote a selection sort algorithm to sort the list by PRICE in ascending order. The output is not what I expected. Have a look at "//Selection Sort" in this code</p> <pre><code>import java.util.Scanner; public class ProductPrices { private static Scanner keyboard = new Scanner(System.in); private static Scanner key = new Scanner(System.in); final static int arrayLength = 1000; //maximum array size static float[] productPrice = new float[arrayLength]; //stores the prices of products static String[] productName = new String[arrayLength]; //stores the names of products public static void main(String[] args) { System.out.println("SHOPPING. Press -1 to quit anytime.\n"); for(int i=0; i&lt;arrayLength; i++) { System.out.print("Product: "); productName[i] = keyboard.nextLine(); if(productName[i].equals("-1")) break; System.out.print("Price: $"); productPrice[i] = key.nextFloat(); if(productPrice[i] &lt; 0) break; } System.out.println("\nList of the SHOPPING!\n---------------------"); for(int i=0; i&lt;productPrice.length; i++) { if(productName[i] == null || productName[i].equals("-1") || productPrice[i] &lt; 0) continue; // null arrays will not be displayed. else { // Selection sort if(productPrice[i] &gt; productPrice[i+1]) { float temp = productPrice[i]; productPrice[i] = productPrice[i+1]; productPrice[i+1] = temp; } System.out.printf("Item: %s %.2f\n", productName[i], productPrice[i]); } } } } </code></pre> <blockquote> <pre><code> For example :::Input::: Product: apple Price: $2.35 Product: pie Price: $1.36 Product: cereal Price: $7.4 Product: -1 :::Output::: Item: apple 1.36 Item: pie 2.35 Item: cereal 0.00 That is incorrect, it should be Item: pie 1.36 Item: apple 2.35 Item: cereal 7.40 </code></pre> </blockquote>
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    1. CO`The output is not what I expected. ` then how is it currently and what do you expect?
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    2. COI added the output example in the code there.
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    3. COWell I bet because this will simply throw an ArrayIndexOutOfBoundsException because you're iterating to i<length while accessing [i+1] index. Also even if it did not, all you're doing is switching prices once. So {3,2,1} would become {2,1,3}. See MergeSort for correct, fast and stable sorting.
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