Here's a Java program to check whether a number is even or odd:

public class Main {
    public static void main(String[] args) {
        int number = 42;

        if (number % 2 == 0) {
            System.out.println(number + " is even");
        } else {
            System.out.println(number + " is odd");
        }
    }
}

In this program, we first initialize an int variable number with the value 42.

We then use the modulus operator % to calculate the remainder when number is divided by 2. If the remainder is 0, number is even; otherwise, it is odd. We use an if statement to check the remainder and print out the appropriate message.

The output of this program will be:

42 is even

You can replace 42 with any other integer value to check whether it is even or odd.