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使用HashMap存储多个企鹅信息，然后统一使用Iterator进行遍历

package ww;
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("1","a");
            map.put("2","b");
            map.put("3","a");
            map.put("4","b");
            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+"\t"+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 + "\t" + sex);
            }
        }
    }

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 ww;
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("1","a");
        map.put("2","b");
        map.put("3","a");
        map.put("4","b");
        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+"\t"+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 + "\t" + sex);
        }
    }
}