Brackets Codility lesson 5

import java.util.Stack;
class Solution {
    public int solution(String S) {
        // write your code in Java SE 8
        char [] test= S.toCharArray();
        Stack<String> container=new Stack<String>();
        for (int index=0;index<test.length;index++){
            char popped=test[index];
            
                if(container.empty()){
                    container.push(String.valueOf(popped));
                    continue;
                }
            if(popped=='{'){
                    container.push("{");
                
            }else if(popped=='}'){
                 if(container.peek().contains("{")){
                    container.pop();
                }else{
                     return 0;
                }
            }else if(popped=='['){
                    container.push("[");
                
            }else if(popped==']'){
                 if(container.peek().contains("[")){
                    container.pop();
                }else{
                     return 0;
                }
            }else if(popped=='('){
                    container.push("(");
                
            }else if(popped==')'){            
                 if(container.peek().contains("(")){
                   container.pop();
                }else{
                    return 0;
                }
            }
        }
        
        if(container.empty()){
           return 1; 
        }else{
         return 0;   
        }
        
    }
}