十五周课后习题

1.使用HashMap存储多个企鹅信息，然后统一使用Iterator进行遍历

package Hmap;

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

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map<String, String> map = new HashMap();
        map.put("yaya", "Q妹");
        map.put("feifei", "Q妹");
        map.put("ouou", "Q仔");        
        map.put("meimei", "Q妹");    
        // System.out.println("iterator迭代器");
        System.out.println("分别是:");
        Set<String> nameset = map.keySet();
        Iterator<String> iter = nameset.iterator();
        while (iter.hasNext()){
            String name = iter.next();
            String sex = map.get(name);
            System.out.println(name+"	"+sex);
        }
        
    }

}

2.为企鹅添加一个编号，并作为键存储多个企鹅信息到应用泛型的HashMap集合 使用Iterator、foreach语句进行遍历

package Hmap;

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

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map<String, String> map = new HashMap();
        map.put("yaya", "Q妹");
        map.put("feifei", "Q妹");
        map.put("ouou", "Q仔");
        map.put("meimei", "Q妹");
        // System.out.println("iterator迭代器");
        System.out.println("分别是:");
        System.out.println("使用iterator遍历");
        Set<String> nameset = map.keySet();
        Iterator<String> iter = nameset.iterator();
        while (iter.hasNext()) {
            String name = iter.next();
            String sex = map.get(name);
            System.out.println(name + "	" + sex);
        }

        System.out.println("使用foreach遍历");
        for (String name : nameset) {
            String sex = map.get(name);
            System.out.println(name + "	" + sex);
        }
    }

}