2020.02.27 集合练习题

package com.guoyun.view;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * ClassName:
 * Function:  ADD FUNCTION
 * Reason:   ADD REASON
 *
 * @author
 * @Date
 * @since Ver 1.1
 */
public class Test10 {
    public static void main(String[] args) {
        Map<Car2,Integer> map=new HashMap<>();
        Car2 c1=new Car2("奥拓",100);
        Car2 c2 = new Car2("宝马", 200);
        Car2 c3 = new Car2("奔驰", 300);
        map.put(c1,10000);
        map.put(c2,500000);
        map.put(c3,2000000);
        Set<Car2> car2s = map.keySet();
        for (Iterator<Car2> iterator = car2s.iterator(); iterator.hasNext(); ) {
            Car2 next =  iterator.next();
            System.out.println(next.getName());
            if(next.getName().equals("宝马")){
                System.out.println(map.get(next));
            }
        }
        map.replace(c1,(int)(map.get(c1)*0.8));
        map.replace(c2,(int)(map.get(c2)*0.8));
        map.replace(c3,(int)(map.get(c3)*0.8));
        for (Iterator<Car2> iterator = car2s.iterator(); iterator.hasNext(); ) {
            Car2 next = iterator.next();
            if (next.getName().equals("宝马")) {
                System.out.println(map.get(next));
            }
        }
    }
}
class Car2{
    private String name;
    private int speed;

    public String getName() {
        return name;
    }

    public int getSpeed() {
        return speed;
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if(this==obj){
            return true;
        }else if(obj instanceof Car2){
            Car2 car2=(Car2) obj;
            if(name.equals(car2.name)){
                return true;
            }
        }
        return false;
    }

    public Car2(String name, int speed) {
        this.name = name;
        this.speed = speed;
    }
}

2020.02.27 集合练习题

原文：https://www.cnblogs.com/aojie/p/12374684.html