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POmatching parentheses code using stack
 

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  1. POmatching parentheses code using stack
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    <p>I want to write a program to be able to receive a String from the Standard input and Check for matching parentheses. Here is my stack code:</p> <pre><code> public interface Stack&lt;E&gt;{ public int size(); public boolean isEmpty(); public E top(); public void push(E element); public E pop()throws EmptyStackException; } </code></pre> <p>And this is the class named MyStack which emplements stack:</p> <pre><code> public class myStack&lt;E&gt; implements Stack&lt;E&gt;{ private final E s[]; int t=0; public myStack() { this.s = (E[]) new Object[100]; } public int size(){ return t; } public boolean isEmpty(){ switch(size()){ case 0: return true; } return false; } public E top() { if(isEmpty()) throw new EmptyStackException(); return s[t-1]; } public void push(E element) { if(isEmpty()) s[0]= element; else s[t]= element; t++; } public E pop() { E x; if(isEmpty()) throw new EmptyStackException(); else{ x = s[t-1]; s[t-1] = null; t--; } return x; } } </code></pre> <p>and this is the main:</p> <pre><code> public static void main(String[] args) { Stack&lt;String&gt; st=new myStack&lt;&gt;(); Scanner s = new Scanner(System.in); String str; str = s.nextLine(); for(int i=0;i&lt;str.length();i++) { if((str.charAt(i)=='{')||(str.charAt(i)=='(')||(str.charAt(i)=='[')) { st.push(str.charAt(i)); } else if((str.charAt(i)=='}')||(str.charAt(i)==')')||(str.charAt(i)==']')) if((st.top()==str.charAt(i))) st.pop(); else { System.out.println("Error"); System.exit(0); } } if(st.isEmpty()) System.out.println("True"); else System.out.println("True"); } </code></pre> <p>But the main code has error in these line: <code>st.push(str.charAt(i));</code> And <code>if((st.top()==str.charAt(i)))</code>. the Error is about converting char to String.</p> <p>can any one please help me to solve these problems??</p> <p>sorry I know this long code is boring But I really need to solve this problem</p> <p>Thanks for your attention in advance</p>
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    1. USLinda
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    1. COJust to know, by Java convenctions, class name should always start with capital letter (MyClassName instead of myClassName)
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      1. POmatching parentheses code using stack
      1. USkajacx
    2. COIs this a homework assignment to create your own `Stack` class? Why not just use `java.util.Stack<E>`
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      1. POmatching parentheses code using stack
      1. USIan McLaird
 

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