test168.java

SCJP认证考试资料

import java.util.*;
public class Test168 implements Comparable{
    public static void main(String[] args) {
	ArrayList<Test168> list = new ArrayList<Test168>();
	list.add(new Test168(2));
	list.add(new Test168(1));
	Collections.sort(list);
	System.out.println(list);
    }
    private int i;
    public Test168(int i) {
	this.i = i;
    }
    public String toString() {
	return Integer.toString(i);
    }
    public int compareTo(Object o) {
	Test168 i2 = (Test168)o;
	return i-i2.i;
    }
}