Validating math operation from user input

Question

I'm working on a project that asks the user for three variable: 2 integers and 1 math operator char of +-*/ or %.

How can I validate the char input as one of the 5 signs? I'm at an impass in my if loop because of all the different conditions:

public static double compMath(int num1, char operator, int num2) {

double result;

if (operator == '+'||'-'||'*'||'/'||'%') {
System.out.println("Math time!");
//performs appropriate math operation (num1,operator,num2) and returns double result (round to 2 decimal places if necessary (format so no decimal is shown unless needed)
} else {
System.out.println("I only know how to do +, -, *, /, or %");
}

return result;
}

Answer 1

full code if curious:

import java.util.Scanner;

public class Jeff_McCann_CIS106_HYB1_ComputerMath {

public static double compMath(int num1, char operator, int num2) {

double result;

if (operator == '+'||'-'||'*'||'/'||'%') {
System.out.println("Math time!");
//performs appropriate math operation (num1,operator,num2) and returns double result (round to 2 decimal places if necessary (format so no decimal is shown unless needed)
} else {
System.out.println("I only know how to do +, -, *, /, or %");
}

return result;
}

public static void main(String[] args) {

Scanner kb = new Scanner(System.in);

System.out.print("Enter integer #1: ");
int input1 = kb.nextInt();

System.out.print("Enter integer #2: ");
int input3 = kb.nextInt();

System.out.print("Which operation? (+-*/%): ");
char input2 = kb.next().charAt(0);

double result = compMath(input1, input2, input3);

System.out.println(input1 + " " + input2 + " " + input3 + " = " + result);

kb.close();
}

}