私は次のコードを持っています。コンパイルしようとすると、次のエラーが発生します。
The method sort(List<T>, Comparator<? super T>) 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)
コード
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 < 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("$0.00");
// Sort in order of Software Name
Collections.sort(aSoftware, new Comparator() {
public int compare(Software s1, Software s2) {
return s1.getSoftwareTitle().compareTo(s2.getSoftwareTitle());
}
});
// Display software title, number of units, cost, item number and total inventory
for (int i = 0; i < aSoftware.length; i++){
System.out.println("Software Title is "+ aSoftware[i].getSoftwareTitle() );
System.out.println("The number of units in stock is "+ aSoftware[i].getSoftwareStock() );
System.out.println("The price of the Software Title is "+ (money.format(aSoftware[i].getSoftwarePrice() )));
System.out.println( "The item number is "+ aSoftware[i].getSoftwareNum());
System.out.println( "The value of the Software Inventory is "+ (money.format(aSoftware[i].Softwarevalue() )));
System.out.println();
}
//output total inventory value
double total = 0.0;
for (int i = 0; i < 3; i++){
total += aSoftware[i].getCalculateInventory();
}
System.out.printf("Total Value of Software Inventory is: \t$%.2f\n", total);
//end output total inventory value
}
}
//
//end
コンパレータを使用してソフトウェアタイトル（配列）をアルファベット順に表示するにはどうすればよいですか？