package ming;import java.util.Comparator;import java.util.TreeSet;class M {	int age;	public M(int age) {		this.age = age;	}	@Override	public String toString() {		return "M[age:" + this.age + "]";	}}public class TreeSetTest {	public static void main(String[] args) {		// TODO Auto-generated method stub		TreeSet ts = new TreeSet(new Comparator() {			//重写compare定制排序方法			public int compare(Object o1, Object o2) {				M m1 = (M) o1;				M m2 = (M) o2;				if (m1.age > m2.age) {					return 1;				} else if (m1.age == m2.age) {					return 0;				} else {					return -1;				}			}		});				ts.add(new M(5));		ts.add(new M(-3));		ts.add(new M(9));		System.out.println(ts);	}}