Question

I am adding string[] into Arraylist, But when i try to retrieve value from it, something wrong happening. and previous values of arraylist getting updated with new entry(String[])
Expected Output :
first , sec
1, 2
one, two

Current Output :
one, two
one, two
one, two

below is the code.

   ArrayList<String[]> list = new ArrayList<String[]>();
   String[] temp ={"First","Sec"};
   list.add(temp);
   temp[0] ="1";temp[1]="2";
   list.add(temp);
   temp[0] ="one";temp[1]="two";
   list.add(temp);

   printLog(list);

here is the print method

   private void printLog(ArrayList<String[]> result) {
    for (int i = 0; i < result.size(); i++) {
        Log.d(TAG,"I="+i);
        String[] temp = result.get(i);
        Log.d(TAG,temp[0]+","+temp[1]+"\n");
    }

}

Any suggessions.

Answer 1

You are adding reference of an array object to the list. You need to create new array each time.

   String[] temp ={"First","Sec"};
   list.add(temp);
   temp=new String[2];
   temp[0] ="1";temp[1]="2";
   list.add(temp);