Java

Java Leak

public class Stack { 

    private Object [ ] items ; 
    private int top ; 

    public Stack ( int size ) { 
        this items = new Object [ size ] ; 
        this top = - 1 ; 
    } 

    private boolean isEmpty ( ) { 
        return top == - 1 ; 
    } 

    private boolean isFull ( ) { 
        return top == items. length ; 
    } 

    public Object pop ( ) throws Exception { 
        if ( this isEmpty ( ) ) { 
                throw new Exception ( "The stack is Empty" ) ; 
        } 
            return items [ top -- ] ; 
    } 

    public void push ( Object obj ) throws Exception { 
        if ( this isFull ( ) ) { 
                    throw new Exception ( "The stack is full" ) ; 
        } 
            items [ ++ top ] = obj ; 
    } 

    public static void main ( String args [ ] ) { 
        Stack stack = new Stack ( 3 ) ; 

        try 
        { 
            stack. push ( new String ( "a" ) ) ; 
            stack. push ( new String ( "ab" ) ) ; 
            stack. push ( new String ( "abc" ) ) ; 
            stack. push ( new String ( "abcd" ) ) ; 
            stack. pop ( ) ; 
            stack. pop ( ) ; 
            stack. pop ( ) ; 
            stack. pop ( ) ; 
        } 
        catch ( Exception ex ) { 

            System out println ( ex. getMessage ( ) ) ; 
        } 

        System out println ( "End" ) ; 

    } 
}