자바/Java ArrayList 안에 ArrayList 넣기

★ 실습

 

package exam;   import java.util.ArrayList;   public class Exam01 {  public static void main(String[] args) {   ArrayList<ArrayList<String>> mGroupList = null;      ArrayList<String> mChildList = null;           mGroupList = new ArrayList<ArrayList<String>>();         mChildList = new ArrayList<String>();                 mChildList.add("차일드1");         mChildList.add("차일드2");         mChildList.add("차일드3");         mGroupList.add(mChildList);                  mChildList = new ArrayList<String>();         mChildList.add("new 차일드1");         mChildList.add("new 차일드2");         mChildList.add("new 차일드3");         mGroupList.add(mChildList);           for(int i=0 ; i<mGroupList.size() ; i++){             System.out.println("array ==>"+ i);                          for(int j=0 ; j<mChildList.size() ; j++){                 System.out.println("array ===>"+ mGroupList.get(i).get(j));             }         }    } }

 

★ 결과

 

array ==>0 array ===>차일드1 array ===>차일드2 array ===>차일드3 array ==>1 array ===>new 차일드1 array ===>new 차일드2 array ===>new 차일드3