15周课后

Posted 2020-12-13 hmy123

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

package homework5;

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

public class text {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map<String, String> map = new HashMap();
        map.put("欧欧", "Q仔");
        map.put("亚亚", "Q妹");
        map.put("菲菲", "Q妹");
        map.put("美美", "Q妹");
        System.out.println("企鹅的昵称和品种分别是:");
        Set<String> keyset = map.keySet();
        Iterator<String> iter = keyset.iterator();
        while (iter.hasNext()) {
            String key = iter.next();
            String value = map.get(key);
            System.out.println(key + "	" + value);
        }

    }

}

2.在上机3的基础上，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 homework5;

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

public class text {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map<String, String> map = new HashMap();
        map.put("欧欧", "Q仔");
        map.put("亚亚", "Q妹");
        map.put("美美", "Q妹");
        map.put("菲菲", "Q妹");
        System.out.println("使用Iterator遍历,企鹅的昵称和品种分别是:");
        Set<String> keyset = map.keySet();
        Iterator<String> iter = keyset.iterator();
        while (iter.hasNext()) {
            String key = iter.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 key : keyset) {
            String sex = map.get(key);
            System.out.println(key + "	" + sex);
        }
    }
}