Comparable 和 TreeSet

import java.util.Set;
import java.util.TreeSet;

/**
 * 测试TreeSet的使用(实际使用TreeMap实现的)
 * 熟悉Comparable接口
 * @author Administrator
 *
 */
public class TestTreeSet {
	public static void main(String[] args) {
		Set<Integer> set = new TreeSet<>(); 
		set.add(30);
		set.add(100);
		set.add(90);
		for(Integer m:set) {
			System.out.println(m);
		}
		
		Set<Employee> set2 = new TreeSet<>();
		set2.add(new Employee(100,"张三",50000));
		set2.add(new Employee(200,"李四",20000));
		set2.add(new Employee(300,"王五",80000));
		set2.add(new Employee(400,"赵六",20000));
		for(Employee m:set2) {
			System.out.println(m);
		}
	}
}