Question

Can you fix my code and remove the errors? Thank you!! ^^

//////////////////////////////////////////////////////////////////////////////////////////////////////

public class StackException<T, size> extends Throwable {


    private final T[] S =  null ;

    public StackException(String s) {
    }

    public T top() throws StackException {

        if (isEmpty()) throw new StackException("Stack is empty.");
        int top = 0;
        return S[top];

    }

    private boolean isEmpty() {
        return false;
    }

    public T pop() throws StackException {

        T item;

        if (isEmpty()) throw new StackException("Stack underflow.");
        int top = 0;
        item = S[top];

        S[top--] = null;

        return item;

    }

    public void push(T item) throws StackException {

        if (<Object capacity = null;
        size() == capacity >)throw new StackException("Stack overflow.");
        int top = 0;
        S[++top] = item;

    }
    private void size() {
    }
}

Answer 1

Hey, I have changed the class name because generic exception class can't be created. I have used array of Object because we can't create array of generic.

Java code:

// stack exception class which print error msg
class StackException extends Throwable {
   StackException(String s) {
       System.out.println(s);
   }
}

// Generic class Stack
// we can't create generic exception class
// that's why i have changed the name of the class
public class Stack<T> {

private Object[] S = null;
private int capacity;
private int top ;
  
public Stack() {
   this.S = new Object[10];
   this.capacity = 10;
   this.top = -1;
}
  
public Stack(int cap) {
   this.S = new Object[cap];
   this.capacity = cap;
   this.top = -1;
}

@SuppressWarnings("unchecked")
   public T top() throws StackException {

if (isEmpty()) throw new StackException("Stack is empty.");
  
return (T)S[top];
}

private boolean isEmpty() {
if (size() == 0 )
   return true ;
return false;
}

@SuppressWarnings("unchecked")
   public T pop() throws StackException {

T item;

if (isEmpty()) throw new StackException("Stack underflow.");
item = (T)S[top];

S[top--] = null;

return item;

}

public void push(T item) throws StackException {

if (size() == capacity)throw new StackException("Stack overflow.");
  
S[++top] = item;

}
private int size() {
   return top + 1;
}
}

I have tested this code and it's working fine.

Hope you like it

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