Comparator interface
- by 1ace1
ok I was going to edit my previous question but i wasnt sure if it was the right way to do it so i'll just give another question about Comparator, now i want to be able to sort with different ways. I have a bank checks and i want to sort with checkNumber then checkAmount
i managed to do it with checkNumber but couldnt figure out how with checkAmount
here is how i did it for checkNumber:
import java.util.Comparator;
public class Check implements Comparator {
private int checkNumber;
private String description;
private double checkAmount;
public Check() {
}
public Check(int newCheckNumber, double newAmountNumber) {
setCheckNumber(newCheckNumber);
setAmountNumber(newAmountNumber);
}
public String toString() {
return checkNumber + "\t\t" + checkAmount;
}
public void setCheckNumber(int checkNumber) {
this.checkNumber = checkNumber;
}
public int getCheckNumber() {
return checkNumber;
}
public void setAmountNumber(double amountNumber) {
this.checkAmount = amountNumber;
}
public double getAmountNumber() {
return checkAmount;
}
@Override
public int compare(Object obj1, Object obj2) {
int value1 = ((Check) obj1).getCheckNumber();
int value2 = ((Check) obj2).getCheckNumber();
int result = 0;
if (value1 > value2){
result = 1;
}
else if(value1 < value2){
result = -1;
}
return result;
}
}
import java.util.ArrayList;
import java.util.Collections;
import test.CheckValue;
public class TestCheck {
public static void main(String[] args) {
ArrayList List = new ArrayList();
List.add(new Check(445, 55.0));
List.add(new Check(101,43.12));
List.add(new Check(110,101.0));
List.add(new Check(553,300.21));
List.add(new Check(123,32.1));
Collections.sort(List, new Check());
System.out.println("Check Number - Check Amount");
for (int i = 0; i < List.size(); i++){
System.out.println(List.get(i));
}
}
}
thank you very much in advance and please tell me if im submiting things in the wrong way.
