Use Java, write in first year beginner level

1. Write a do-while loop that asks the user to enter two numbers. The numbers should be added and the sum displayed. The loop should ask the user whether he or she wishes to perform the operation again. If so, the loop should repeat; otherwise it should terminate.

import java.util.*; 2. Write an input validation loop that asks the user to enter the word yes or no. 3.Write code that does the following: opens the NumberList.txt file, reads all of the numbers from the file and displays them, and then closes the file.

PrintWriter outputFile = new PrintWriter(NumberList.txt)

for (int i=1; i <=100; i++)

outputFile.println(i);

outputFile.close();