SHow the effect of each of the following operations on stack s. Assume that y(ty

Question

SHow the effect of each of the following operations on stack s. Assume that y(type Character) constains the character '&'. What are the final values of x and success and the contents of the stack s?

CODE:
Stack<Character> s = new Stack<Character>();
char x;
s.push('+');
try{
x = s.pop();
success = true;
}
catch (EmptyStackException e){
success = false;
}
try{
x = s.pop();
success = true;
}
catch (EmptyStackException e){
success = false;
}
s.push('(');
s.push(y);
try {
x = s.pop();
success = true;
}
catch (EmptyStackException e){
success = false;
}

Explanation / Answer

Stack<Character> s = new Stack<Character>();
char x;
s.push('+');
try{
x = s.pop();                               // here x will be '+'
success = true;                        // ssuccess will be true
}
catch (EmptyStackException e){               // no error to catch
success = false;
}
try{
x = s.pop();                              // error stack is empty
success = true;                       
}
catch (EmptyStackException e){      // this will execute
success = false;                      // success will be false
}
s.push('(');                             
s.push(y);
try {
x = s.pop();                   // x = '&'
success = true;          // success will be true
}
catch (EmptyStackException e){
success = false;
}

// final valus of x is '&'

// successs = true

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