java use method and loops and switch statment

Write a method called randOperator() that will return a random arithmetic operator. The possible operators returned are: +, -, *, /, and %. To generate a random operator, you generate a random number between 0 and 4. You can use a switch statement to return the operator based on the integer value. For example, if the random number is 0, the method returns +.

Write a method called compute (char op, int first, int second,int third) that computes the operation on the first and second and third operand and returns the result..

e.g. 20 / 4 + 5

In your main method, prompts the user for the number of expressions. Use a for loop prints random arithmetic expressions and their answers.