Question

You are given the following Java files:

• TestCharacterStack.java that contains class LLStack with class stackNode listed as inner class.

  

You are given the following Java file: TestCharacterStack.java inside the class add the method below:

        public boolean ParenthesesMatching (String text)

takes a string text, and parenthesis whether its parenthesis are "balanced."

Hint: for left parenthesis, push onto stack; for right parenthesis, pop from stack and check

whether popped element matches right parenthesis, else return false.

If returned value is true, print “no delimiter error.”, else print “delimiter error”.

-Suppose the entered text (a+b(1*c-2)*1)

When call the method, the output will be: no delimiter error.

-Suppose the entered text ((a+b*(c+a)+5)

When call the method, the output will be: delimiter error.

Answer 1

import java.util.Stack;

public class TestCharacterStack {
   public static void main(String[] args) {
       TestCharacterStack t = new TestCharacterStack();
       if(t.ParenthesesMatching("(a+b(1*c-2)*1)"))
           System.out.println("no delimiter error.");
       else
           System.out.println("delimiter error.");
       if(t.ParenthesesMatching("((a+b*(c+a)+5)"))
           System.out.println("no delimiter error.");
       else
           System.out.println("delimiter error.");
          
      
   }
   public boolean ParenthesesMatching(String text) {
       Stack<Character> stack = new Stack<Character>();
       boolean flag = true;
       char c;
       for (int i = 0; i < text.length() && flag; i++) {
           c = text.charAt(i);
           if (c == '(') {
               stack.push(c);
               continue;
           }
           switch (c) {
           case ')':
               if (stack.pop() != '(')
                   flag = false;
               break;

           }

       }
       return (stack.isEmpty() && flag);
   }

}

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