Nomor 2

package nomor02;

import java.util.*;

class Verification {

	static boolean pairCharacters(Stack<String> a) {

		Stack<String> help = new Stack<String>();
		while (!a.isEmpty()) {
			help.push(a.peek());
			a.pop();
		}
		while (help != null) {
			String x = help.peek();
			help.pop();
			String y = help.peek();
			help.pop();
			if ((x!="/*" && y!="*\\")
				|| (x!="(" && y!=")")
				|| (x!="[" && y!="]")
				|| (x!="{" && y!="}"))
			return false;
		}
		return true;
	}

public static void main(String[] args) {
	Stack<String> a = new Stack<String>();
	a.push("/*");
	a.push("*\\");
	a.push("(");
	a.push(")");
	a.push("[");
	a.push("]");
	a.push("{");
	a.push("}");
	if(pairCharacters(a))
		System.out.println("YEAH:)");
	else
		System.out.println("NOPE:(");
}
}