Odd, Even and Prime No. from 1-150 in JAVA

public void main() {
    Log.e("TAG", "main: Enter the number to check prime:");
    checkPrime();

}


public void checkPrime() {
    int i = 0;
    int num = 0;
    //Empty String
    String primeNumbers = "";
    String evenNumbers = "";
    String oddNumbers = "";

    for (i = 1; i <= 150; i++) {
        int counter = 0;
        for (num = i; num >= 1; num--) {
            if (i % num == 0) {
                counter = counter + 1;
            }
        }
        if (counter == 2) {
            //Appended the Prime number to the String
            primeNumbers = primeNumbers + i + " ";
        }

        if (i % 2 == 0) {
            evenNumbers = evenNumbers + i + ", ";
        }else
            oddNumbers = oddNumbers + i + ", ";

    }
    System.out.println("Prime numbers from 1 to 150 are : "  +  primeNumbers);
    System.out.println("Odd  numbers from 1 to 150 are : " + oddNumbers);
    System.out.println("Even numbers from 1 to 150 are : " + evenNumbers);
}