https://www.hackerrank.com/challenges/balanced-brackets

BracketsChecker.java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Stack;

/**
 * @author richard.santana
 */
public class BracketsChecker {

	private final static List<Character> OPEN_BRACKET = Arrays.asList('{','[','(');
	private final static List<Character> CLOSE_BRACKET = Arrays.asList('}',']',')');

	public static void main(String[] args) {
		String[] testValue = Arrays.asList("{","{}","{[]}()","{[}]","{}[][{()}]").toArray(new String[]{});
		System.out.println(Arrays.toString(bracketsCheck(testValue)));
	}

	private static String[] bracketsCheck(final String[] input) {
		List<String> result = new ArrayList<>();
		for(String value : input){
			result.add(verify(value));
		}
		return result.toArray(new String[result.size()]);
	}

	private static String verify(final String value) {
		Stack<Character> stack = new Stack<>();
		for(Character actual : value.toCharArray()){
			if(OPEN_BRACKET.contains(actual)){
				stack.add(actual);
			}else if (CLOSE_BRACKET.contains(actual)){
				Character close = stack.pop();
				if(('}' == actual && '{' != close) || (')' == actual && '(' != close) ||(']' == actual && '[' != close)){
					return "NO";
				}
			}
		}
		return stack.empty() ? "YES" : "NO";
	}

}