[ android & java 예제 코드] ArrayList의 item으로 HashMap 사용하는 방법

HashMap에 원하는 데이터를 입력하여 ArrayList의 item 추가한 후,  다시 ArrayList에서 HashMap을 꺼내서 HashMap에 있는 값들을 출력하는 예제코드입니다.

Java(JDK)와 Android Studio를 사용하여  각각 테스트 하기 위한 코드를 추가해두었습니다.

JAVA

import java.util.ArrayList; import java.util.HashMap; public class HashMapTest {    public static void main(String[] args) {        String TAG_ID = "id";        String TAG_NAME = "name";        String TAG_ADDRESS ="address";        ArrayList<HashMap<String, String>> mArrayList = new ArrayList<>();                for(int i=0;i<20;i++){            HashMap<String,String> hashMap = new HashMap<>();            hashMap.put(TAG_ID, "id"+i );            hashMap.put(TAG_NAME, "name"+i );            hashMap.put(TAG_ADDRESS, "address"+i );            mArrayList.add(hashMap);        }        for( int i = 0; i < mArrayList.size(); i++ ){            HashMap<String,String> hashMap = mArrayList.get(i);            System.out.println( hashMap.get(TAG_ID) + " " + hashMap.get(TAG_NAME) + " " + hashMap.get(TAG_ADDRESS) );        }    } }

C:\Users\webnautes>javac HashMapTest.java C:\Users\webnautes>java HashMapTest id0 name0 address0 id1 name1 address1 id2 name2 address2 id3 name3 address3 id4 name4 address4 id5 name5 address5 id6 name6 address6 id7 name7 address7 id8 name8 address8 id9 name9 address9 id10 name10 address10 id11 name11 address11 id12 name12 address12 id13 name13 address13 id14 name14 address14 id15 name15 address15 id16 name16 address16 id17 name17 address17 id18 name18 address18 id19 name19 address19

ANDROID

package com.tistory.webnautes.hashmaptest; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import java.util.ArrayList; import java.util.HashMap; public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        String TAG_ID = "id";        String TAG_NAME = "name";        String TAG_ADDRESS ="address";        ArrayList<HashMap<String, String>> mArrayList = new ArrayList<>();                for(int i=0;i<20;i++){            HashMap<String,String> hashMap = new HashMap<>();            hashMap.put(TAG_ID, "id"+i );            hashMap.put(TAG_NAME, "name"+i );            hashMap.put(TAG_ADDRESS, "address"+i );            mArrayList.add(hashMap);        }        for( int i = 0; i < mArrayList.size(); i++ ){            HashMap<String,String> hashMap = mArrayList.get(i);            Log.d("@@@", hashMap.get(TAG_ID) + " " + hashMap.get(TAG_NAME) + " " + hashMap.get(TAG_ADDRESS) );        }    } }

Logcat에 다음처럼 출력됩니다.

07-01 10:40:37.831 1907-1907/com.tistory.webnautes.hashmaptest D/@@@: id0 name0 address0    id1 name1 address1    id2 name2 address2    id3 name3 address3    id4 name4 address4    id5 name5 address5    id6 name6 address6    id7 name7 address7    id8 name8 address8    id9 name9 address9    id10 name10 address10    id11 name11 address11    id12 name12 address12    id13 name13 address13    id14 name14 address14 07-01 10:40:37.832 1907-1907/com.tistory.webnautes.hashmaptest D/@@@: id15 name15 address15    id16 name16 address16    id17 name17 address17    id18 name18 address18    id19 name19 address19