import java.util.*;
public class Main{
public static void main(String[] args){
Map<Integer,String> map = new HashMap<>();
map.put(1, "a");
map.put(12, "qwe");
map.put(3, "cd");
map.put(15, "bb");
for(Integer key : map.keySet()){
}
for(String str : map.values()){
}
for(Map.Entry<Integer,String>it : map.entrySet()){
}
Set set = map.keySet();
Object[] arr = set.toArray();
Arrays.sort(arr);
for(Object key : arr){
}
Set<Integer> set2 = map.keySet();
List<Integer> list = new ArrayList<Integer>(set2);
Collections.sort(list);
Collections.reverse(list);
for(Integer t : list){
System.out.println(t+map.get(t));
}
}
}
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Test {
public static void main(String[] args) {
HashMap<Integer,String> map = new HashMap<Integer,String>();
map.put(1,"oa1");
map.put(3,"oa3");
map.put(2,"oa2");
map.put(4,"oa4");
List<String> list = new ArrayList<String>();
for(Map.Entry<Integer, String> entry : map.entrySet()){
System.out.println("entry.getKey.hash:" + entry.getKey().hashCode());
list.add(entry.getValue());
}
/System.out.println(list);
for(Integer t : map.keySet()){
System.out.println(t);
}
for(Map.Entry<Integer,String>entry : map.entrySet()){
System.out.println(entry.getKey()+entry.getValue());
}
}
}