黑马程序员---------------------声明类Students，包含3个成员变量：name、age、score，创建5个对象装入TreeSet，按照成绩排序输出结果（考虑成绩相同的问题）。

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public>public>TreeSet<Students>>
ts.add(new Students("张三", 23, 78.9));
ts.add(new Students("李四", 45, 90.99));
ts.add(new Students("王五", 45, 90));
ts.add(new Students("赵六", 34, 89));
ts.add(new Students("小明", 14, 89.7));
Iterator<Students>>
System.out.println("姓名\t年龄\t分数");
while (it.hasNext()) {
Students>
System.out.println(stu.getName() + "\t" + stu.getAge() + "\t"
+ stu.getscore());
}
}

}
class Students implements Comparable<Object> {
private String name;
private int age;
private double score;

public int compareTo(Object obj) {
if (!(obj instanceof Students))
throw new RuntimeException("不是学生类型");
Students>
if (this.age > s.age)
return 1;
if (this.age == s.age)
return 0;
return -1;
}

Students(String name, int age, double score) {
this.name = name;
this.age = age;
this.score = score;
}

public String getName() {
return name;
}

public int getAge() {
return age;
}

public double getscore() {
return score;
}
}

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