java有关问题again

java问题again

Java code

class rec implements Comparable{    int x,y;    public int compareTo(Object o) {        return 0;    }}

Java code

public int compareTo(Object o) {  rec t = (rec) o;  if (this.x == o.x) {    return this.y - o.y;  }  return this.x - o.x;}