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POSorting an array using Comparator
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  1. POSorting an array using Comparator
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    copied!<p>I have the following code. When I try to compile it, it gives me the following error:</p> <pre><code>The method sort(List&lt;T&gt;, Comparator&lt;? super T&gt;) in the type Collections is not applicable for the arguments (Software[], new Comparator(){}) The type new Comparator(){} must implement the inherited abstract method Comparator.compare(Object, Object) </code></pre> <h3>Code</h3> <pre><code>import java.text.DecimalFormat; // For proper currency import java.util.Comparator; import java.util.Collections; public class Software { // Declare variables String SoftwareTitle; // SoftwareTitle int SoftwareStock; // Software totals double SoftwarePrice; // Software Price int SoftwareNum; // Software Product ID double CalculateInventory; // To add inventory double SoftwareValue; // Software Total value double value; // Complete inventory total Software( String softtitle, int softstock, double softprice, int softitemnum ) { // Create object constructor SoftwareTitle = softtitle; SoftwareStock = softstock; SoftwarePrice = softprice; SoftwareNum = softitemnum; } // Set Software Title public void setSoftwareTitle( String softtitle ) { SoftwareTitle = softtitle; } // Return Software Title public String getSoftwareTitle() { return SoftwareTitle; } // Set software inventory public void setSoftwareStock( int softstock) { SoftwareStock = softstock; } // Return software inventory public int getSoftwareStock() { return SoftwareStock; } // Set software price public void setSoftwarePrice( double softprice ) { SoftwarePrice = softprice; } // Return software price public double getSoftwarePrice() { return SoftwarePrice; } // Set item number public void setSoftwareNum( int softitemnum ) { SoftwareNum = softitemnum; } // //return software item number public int getSoftwareNum() { return SoftwareNum; } // // calculate inventory value public double Softwarevalue() { return SoftwarePrice * SoftwareStock; } public void setCalculateInventory (double value){ this.CalculateInventory = value; } public double getCalculateInventory(){ double value = 0; for(int i = 0; i &lt; 3; i++){ value = Softwarevalue(); } return value; } }//end method value // import java.text.DecimalFormat; // For proper currency import java.util.Arrays; import java.util.Collections; import java.util.Comparator; public class Inventory { public static void main( String args[] ) { // Start array of software titles Software[] aSoftware = new Software[4]; aSoftware[0]= new Software("Command and Conquer ", 6, 29.99, 10122); aSoftware[1]= new Software("Alice in Wonderland", 1, 10.99,10233); aSoftware[2]= new Software("Doom", 1, 10.99, 10344); aSoftware[3]= new Software("Walking Dead", 6, 9.99, 10455); //Set currency format DecimalFormat money = new DecimalFormat("$0.00"); // Sort in order of Software Name Collections.sort(aSoftware, new Comparator() { public int compare(Software s1, Software s2) { return s1.getSoftwareTitle().compareTo(s2.getSoftwareTitle()); } }); // Display software title, number of units, cost, item number and total inventory for (int i = 0; i &lt; aSoftware.length; i++){ System.out.println("Software Title is "+ aSoftware[i].getSoftwareTitle() ); System.out.println("The number of units in stock is "+ aSoftware[i].getSoftwareStock() ); System.out.println("The price of the Software Title is "+ (money.format(aSoftware[i].getSoftwarePrice() ))); System.out.println( "The item number is "+ aSoftware[i].getSoftwareNum()); System.out.println( "The value of the Software Inventory is "+ (money.format(aSoftware[i].Softwarevalue() ))); System.out.println(); } //output total inventory value double total = 0.0; for (int i = 0; i &lt; 3; i++){ total += aSoftware[i].getCalculateInventory(); } System.out.printf("Total Value of Software Inventory is: \t$%.2f\n", total); //end output total inventory value } } // //end </code></pre> <p>How do I get the software titles (an array) to display in alphabetical order using the Comparator?</p>
 

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