i am struggling with this exercise.Write a simple java GUI programme that will prompt a user to enter two numbers in a JoptionPane. The code should test and verify that the values entered is a number,...

i am struggling with this exercise.Write a simple java GUI programme that will prompt a user to enter two numbers in a JoptionPane. The code should test and verify that the values entered is a number, if not, it should flag a message prompting the use to enter a number. The values should be used to calculate the sum. The output should be displayed on a Message dialog.when I am trying : try catch methods the program just give the last output and don't go back to finish the program