test21.java

SCJP认证考试资料

import java.util.*;
class MyClass {
    int i;
    MyClass(int i) {
	this.i = i;
    }
    public String toString() {
	return(""+i);
    }
}
public class Test21 {
    public static void main(String[] args) {
	Set<MyClass> s = new TreeSet<MyClass>();
	s.add(new MyClass(2));
	//	s.add(new MyClass(3));
		s.add(new MyClass(1));
	/*
	for (Object m:s) {
	    System.out.println(m);
	}
	*/
    }
}