[JAVA] Data acquisition method memo when there is HashMap in HashMap

As a personal note

Here's how to get a HashMap with nothing in particular

HashMapSample1.java

import java.io.*;
import java.util.*

public class Sample {
    public static void main(String[] args){
         HashMap<Integer, String> hashMap = new HashMap <>();
         for(int key : hashMap.KeySet()) {
             System.out.println(hashMap.getkey));
         }
     }
}

How to get the value when HashMap matches in HashMap is as follows

HashMapSample2.java

import java.io.*;
import java.util.*

public class Sample {
    public static void main(String[] args){
         HashMap<Integer i, HashMap<String, String>> hashMap = new HashMap<>();
         for(int key : hashMap) {
             System.out.println(hashMap.get(key).get(target));
         }
     }
}