Write a java program to implement a single digit number RPN Calculator (1)A Frame, which is also the main class. Class name: RPNCalculator 2A Label, for showing the input and the result. 3the cancel Button. For clearing the current result and start again. 4 Four Buttons. For the +, -, *, / operators. 5Ten Buttons. For entering 0 9.

Notes and hints: 1.This is a RPN calculator. E.g.,2 + 6 is entered as2 6+ 2.use a Stack for storing the numbers and intermediate results. 3.All input numbers are single digit; After a number has been pressed, show it in the result Label and push it onto the stack 4. After an operator (+, -, *, /) has been pressed, take the previous two numbers as the operants, calculate the results, and show it. This means that you need to pop the previous two results from theStack, calculate the result,and push the result back onto the stack (see the lecture notes again).; 5.If the user presses the C button. Clear all the contents, and reset the result to 0. 6.If an error occurs (e.g., the stack is empty, or division by zero), show the word "Error" in the result.

1 2 3 + 4. 5 5 6 7 8 9 k 0 /