6.12作业

使用HashMap存储多个企鹅信息，然后统一使用Iterator进行遍历

package schooljihe;

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) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("亚亚", "Q妹");
        map.put("菲菲", "Q妹");
        map.put("欧欧", "Q仔");
        map.put("亚亚", "Q妹");
        map.put("美美", "Q妹");
        System.out.println("使用Iterator遍历，所有企鹅的昵称和品种分别是：");
        Set<String> keyset = map.keySet();
        Iterator<String> it = keyset.iterator();
        while (it.hasNext()) {
            String key = it.next();
            String value = map.get(key);
            System.out.println(key + "     " + value);
        }

        System.out.println("使用foreach遍历，所有企鹅的昵称和品种分别是：");
        for (String in : map.keySet()) {
            String str = map.get(in);
            System.out.println(in + "     " + str);
        }
    }
}

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 schooljihe;

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) {

        
        Map<Integer,Penguin> map1 = new HashMap<Integer,Penguin>();
        Penguin a1 = new Penguin("欧欧","Q仔");
        Penguin a2 = new Penguin("亚亚","Q妹");
        Penguin a3 = new Penguin("美美","Q妹");
        Penguin a4 = new Penguin("菲菲","Q妹");
        map1.put(1, a1);
        map1.put(2, a2);
        map1.put(3, a3);
        map1.put(4, a4);
        System.out.println("使用foreach遍历，所有企鹅的昵称和品种分别是：");
        for (Integer in : map1.keySet()) {
            Penguin str = map1.get(in);
            System.out.println(in + "     " + str.getName()+ "     " +str.getSex());
        }
        System.out.println("使用Iterator遍历，所有企鹅的昵称和品种分别是：");
        Set<Integer> key = map1.keySet();
        Iterator<Integer> it1 = key.iterator();
        while (it1.hasNext()) {
            Integer key1 = it1.next();
            Penguin value = map1.get(key1);
            System.out.println(key1 + "     " + value.getName()+ "     " +value.getSex());
        }
        
    }
}