ArrayList lastIndexof

Question

import java.util.Scanner;
import java.util.*;
public class bracketMatch {

    public bracketMatch() {
    }


    public static void main (String[] args) {
    Scanner scan = new Scanner(System.in);
    System.out.println("enter seq");
    String[] seq = scan.nextLine().split("");
    ArrayList<String> temp = new ArrayList<>();
    int x = 0;
    String check = null;
    System.out.println(Arrays.toString(seq));   
        for(String brak : seq)
        {
            switch(brak)
            {
                case "(":
                    temp.add("(");

                    break;
                case "[":
                    temp.add("[");

                    break;
                case "{":
                    temp.add("{");

                    break;
                case "<":
                    temp.add("<");

                    break;
                case ")":
                    temp.add( ")");

                    break;
                case "]":
                    temp.add("]");

                    break;
                case "}":
                    temp.add("}");

                    break;
                case ">":
                    temp.add(">");

                    break;


            }

        }


                      x =  temp.lastIndexOf("(");
                        System.out.println( x);
                   /*  if(x != -1)
                     {  
                        temp.remove(check);
                        temp.remove(x);

                        }*/


                      System.out.println(temp.toString()) ;

    }

}

The above code is for matchingbrackets, but I stumbled upon ArrayList method lastIndexOf.
However, it is not fetching the correct index and is working like indexOf method.

Should I use stack or linkedlist instead of ArrayList?

Also, any help on iterating an arraylist and removing its element, since iterator and foreach gives error.

Answer 1

Can you give us some more information? Method lastIndexOf works properly, it gives you last occurence of object in list, it doesn't work like indexOf. If you want to delete last occurence of "(" from arraylist just uncomment your temp.remove(x) line.