第十五周课后作业

package aaa;
 
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) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("露露", "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("一共有"+map.size()+"个企鹅，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 x = it.next();
            String s = map.get(x);
            System.out.println(x + "     " + s);
        }
 
        System.out.println("一共有"+map.size()+"个企鹅，使用foreach遍历，所有企鹅的昵称和品种分别是：");
        for (String a : map.keySet()) {
            String b = map.get(a);
            System.out.println(a + "     " + b);
        }
    }
 
}

　　

package aaa;

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) {
		Map<String, String> map = new HashMap<String, String>();
		map.put("露露", "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("一共有" + map.size() + "个企鹅,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 x = it.next();
			String s = map.get(x);
			System.out.println(x + "     " + s);
		}
	}
}