遍历3方式

package Z3_1;

import java.util.*;

public class QWE {
public static void main(String[] args) {
    Map mijia=new HashMap();
    mijia.put("cn", "china");
    mijia.put("uk", "ufo");
    //方式一    增强for
    System.out.println("方式一增强for");
    Set ks=mijia.keySet();//keyset
    for (Object object : ks) {
        System.out.println(mijia.get(object));
    }
    //方式二    迭代器Iterator
    System.out.println("方式二，迭代器Iteration");
    Iterator it=ks.iterator();
    while(it.hasNext()){
        String sk=(String)it.next();
        System.out.println(sk+"=="+mijia.get(sk));
    }
    

//    Set set =mapContries.entrySte();
//    for (Object object : set) {
//        Map.Entryentry=(Map.Entry);
//        entry.getKey();//String
//        entry.getValue();
//    }
    
    
    
//    //遍历方式三 
    Dog dog1=new Dog("mijia","5714");
    Dog dog2=new Dog("qwe","123");
    Dog dog3=new Dog("sad","456");
    Dog []dogg=new Dog[3];
    
    HashMap hm=new HashMap<>();
    hm.put(1, dog1);
    hm.put(2, dog2);
    hm.put(3, dog3);
    Set set =hm.entrySet();
    Iterator itt=set.iterator();
    while(itt.hasNext())
    {
        Map.Entry en=(Map.Entry)itt.next();
        Dog dog =(Dog)en.getValue();
        System.out.println(en.getKey()+" "+en.getValue());
    }
}
}