434445464748495051
default: return false; } // pop two numbers off the stack and push the result Expression rhs = stack.pop(), lhs = stack.pop(); stack.push(new OperationExpression(operator, lhs, rhs)); return true; }
85868788899091929394
// get the command-line argument from the array String expression = args[0]; // print the result of calculate Expression tree = parse(expression); int result = tree.getValue(); System.out.println(result); }