JAVA小练习121——collections一些方法的重载

import java.util.ArrayList;
import java.util.Comparator;
import java.util.Collections;

class Emp  {
	String name;
	int salary;
	
	public Emp(String name, int salary) {
		super();
		this.name = name;
		this.salary = salary;
	}

	@Override
	public String toString() {
		return "{姓名：" +this. name + " 薪水：" + this.salary + "}";
	}
}

	
	//自定义一个比较器
	class MoneyComparator implements Comparator<Emp>{
		public int compare(Emp o1,Emp o2) {
			return o1.salary-o2.salary;
		}
		
	}
			


public class Demo121 {

	public static void main(String[] args) {
		ArrayList<Emp> list=new ArrayList<Emp>();
		MoneyComparator comparator=new MoneyComparator();
		list.add(new Emp("狗娃",500));
		list.add(new Emp("狗剩",700));
		list.add(new Emp("狗子",200));
		list.add(new Emp("狗哥",3000));
		
		Collections.sort(list,comparator);
		
		System.out.println("集合元素："+list);
		System.out.println("狗哥在哪里："+Collections.binarySearch(list,new Emp("狗哥",3000), comparator));
		System.out.print("最大值："+Collections.max(list,comparator));
		System.out.println("最小值："+Collections.min(list,comparator));
		
	}

}