I have a question need help ?!

Write a Java program to implement stack by creating user defined push method for entering {and (, and pop method for retrieving {and (from the stack. This program is for expression evaluation and syntax parsing. Your program should display appropriate error message if input expression has wrong. Pseudo Code Example: int howMany = 5; String [] mystatement = new String [howMany]; char [] myStack = new char [4 theta]; int stackTop;//Main method myStatement [theta] = "(1 + 3) {2 - 1)"; myStatement [4] = "(1 + 3) ((2 - 1)"; for (int i = theta; i