Static methods can't run other methods?

Question

So, I'm trying to make an extremely simple program.

public class test {
    public static void main (String args[]){
        System.out.println("Yum! Pi!");
        int pi = 1;
        varCreate();
        varAdd();
    }
    public void varCreate () {
        pi++;
    }
    public void varAdd () {
        System.out.println(pi);
    }
}

It's wont let me do this, it says something along the lines of: "cannot make static reference to the non-static method varAdd from the type test" I'm sure there's an extremely simple error, I just can't find it. Kudos for any help!

make both varCreate() and varAdd() static as well and you should be good to go — Satya, Oct 07 '12 at 02:48

score 4 · Accepted Answer · answered Oct 07 '12 at 02:49

4

static methods can only call static methods.

Either make the functions static or create an instance variable to call the methods.

public class test {
    static int pi = 1;
    public static void main (String args[]){
        System.out.println("Yum! Pi!");
        varCreate();
        varAdd();
    }
    public static void varCreate () {
        pi++;
    }
    public static void varAdd () {
        System.out.println(pi);
    }
}

answered Oct 07 '12 at 02:49

P.P

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Oof. Shoulda thought of that. Thanks! – Cowthulhu Oct 07 '12 at 02:49
Still won't work of course since `int pi` is only declared within the scope of `main`.... – Roddy of the Frozen Peas Oct 07 '12 at 02:51
Added code by making `pi` static as well. – P.P Oct 07 '12 at 02:55

score 3 · Answer 2 · answered Oct 07 '12 at 03:11

You need to instantiate your Test class to use (non-static) methods:

class Test {
    int pi = 1;

    public static void main (String args[]){
        System.out.println("Yum! Pi!");
        Test t = new Test();
        t.varCreate();
        t.varAdd();
    }
    public void varCreate () {
        pi++;
    }
    public void varAdd () {
        System.out.println(pi);
    }
}

`

Static methods can't run other methods?

2 Answers2