compareTo() method java is acting weird
- by Ron Paul
hi im having trouble getting this to work im getting an error here with my object comparison...how could I cast the inches to a string ( i never used compare to with anything other than strings) , or use comparison operators to compare the intigers,
Object comparison = this.inches.compareTo(obj.inches);
here is my code so far
import java.io.*;
import java.util.*;
import java.lang.Integer;
import java.lang.reflect.Array;
public class Distance implements Comparable<Distance> {
private static final String HashCodeUtil = null;
private int feet;
private int inches;
private final int DEFAULT_FT = 1;
private final int DEFAULT_IN = 1;
public Distance(){
feet = DEFAULT_FT;
inches = DEFAULT_IN;
}
public Distance(int ft, int in){
feet = ft;
inches = in;
}
public void setFeet(int ft){
try {
if(ft<0){
throw new CustomException("Distance is not negative");
}
}
catch(CustomException c){
System.err.println(c);
feet =ft;
}
}
public int getFeet(){
return feet;
}
public void setInches(int in){
try
{
if (in<0)
throw new CustomException("Distance is not negative");
//inches = in;
}
catch(CustomException c)
{
System.err.println(c);
inches = in;
}
}
public int getInches(){
return inches;
}
public String toString (){
return "<" + feet + ":" + inches + ">";
}
public Distance add(Distance m){
Distance n = new Distance();
n.inches = this.inches + m.inches;
n.feet = this.feet + m.feet;
while(n.inches>12){
n.inches = n.inches - 12;
n.feet++;
}
return n;
}
public Distance subtract(Distance f){
Distance m = new Distance();
m.inches = this.inches - f.inches;
m.feet = this.feet - f.feet;
while(m.inches<0){
m.inches = m.inches - 12;
feet--;
}
return m;
}
@Override
public int compareTo(Distance obj) {
// TODO Auto-generated method stub
final int BEFORE = -1;
final int EQUAL = 0;
final int AFTER = 1;
if (this == obj) return EQUAL;
if(this.DEFAULT_IN < obj.DEFAULT_FT) return BEFORE;
if(this.DEFAULT_IN > obj.DEFAULT_FT) return AFTER;
Object comparison = this.inches.compareTo(obj.inches);
if (this.inches == obj.inches) return compareTo(null);
assert this.equals(obj) : "compareTo inconsistent with equals";
return EQUAL;
}
@Override public boolean equals( Object obj){
if (obj != null) return false;
if (!(obj intanceof Distance)) return false;
Distance that = (Distance)obj;
( this.feet == that.feet &&
this.inches == that.inches);
return true;
else
return false;
}
@Override public int hashCode(int, int) {
int result = HashCodeUtil.inches;
result = HashCodeUtil.hash(result, inches );
result = HashCodeUtil.hash(result, feet);
ruturn result;
}
