import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
// import java.util.*;
import java.util.Set;
public class Hello {
public static void main(String[] args) {
Map<String, String> map = new HashMap<String, String>();
// Map<String, String> map = new HashMap();
map.put("1", "hello");
map.put("2", "world");
map.put("3", "vinter");
System.out.println(map);
String mv = map.remove("1");
System.out.println(map);
System.out.println(mv);
String hi = map.put("2", "hi");
System.out.println(map);
System.out.println(hi);
String en = map.get("3");
System.out.println(en);
System.out.println("-------------");
Set<String> list = map.keySet();
for(String key : list) {
System.out.println(map.get(key));
}
}
}
