Develop a Java program to identify the largest among four numbers (32, 29,34, 21) using appropriate control statement and operators.

Sure, here is a simple Java program that identifies the largest among four numbers (32, 29, 34, 21) using if-else control statement and comparison operators.

public class Main {
    public static void main(String[] args) {
        // define the numbers
        int num1 = 32, num2 = 29, num3 = 34, num4 = 21;

        // assume the first number is the largest
        int largest = num1;

        // compare the first number with the second, third and fourth numbers
        if (num2 > largest) {
            largest = num2;
        }

        if (num3 > largest) {
            largest = num3;
        }

        if (num4 > largest) {
            largest = num4;
        }

        // print the largest number
        System.out.println("The largest number is " + largest);
    }
}

This program first assumes that the first number is the largest. Then it compares this number with the second, third, and fourth numbers. If it finds a number that is larger, it updates the largest variable. Finally, it prints out the largest number.