编辑代码

import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.Collection;
public class Demo18 {
    public static void main(String[] args ) {
        Map<String, String> map = new HashMap<>();
        map.put("name","--哥");
        map.put("age","30");
        map.put("sex","男");

       Set<String> keySet = map.keySet();
       for(String key : keySet){
           System.out.println("key="+key);
       }
       Collection<String> values =map.values();
       for(String value:values) {
              System.out.println("vlaue"+value);
       }
    }   
}