non static variable this cannot be referenced from a static context

Question

My line sb.init(this); always comes back with a "non static variable this cannot be referenced from a static context." I cant figure out why.

package asteroidgame;

import blobmx.BlobGUI;
import blobmx.SandBox;
import blobmx.SandBoxMode;
import java.util.Random;

public class AsteroidGame implements BlobGUI{

private static final Random random = new Random();

public static void main(String[] args) {
    AsteroidGame();
}    
public static void AsteroidGame(){ 
    SandBox sb = new SandBox();
    sb.setSandBoxMode(SandBoxMode.FLOW);
    sb.setFrameRate(66);
    sb.init(this);
}

What do you think `this` is should be referring to and why do you think so? — Sotirios Delimanolis, Mar 27 '15 at 18:50
PLEASE google it !!! You will find at least 1000 questions with same title. — Aditya Peshave, Mar 27 '15 at 18:50
It looks like that's meant to be a constructor? If so, remove the words `static void`. — Paul Boddington, Mar 27 '15 at 18:51
I spent at least an hour googling threads just like this one. Did not help me. — Christopher, Mar 27 '15 at 19:02

score 1 · Answer 1 · answered Mar 27 '15 at 18:50

1

this cannot be used inside static method. As there is no instance representation inside the static method.

answered Mar 27 '15 at 18:50

Crazyjavahacking

9,343
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pbabcdefp was right about it being a constructor. I removed the static void part and it fixed the first problem but now my call to the constructor says it cannot find the symbol: AsteroidGame() – Christopher Mar 27 '15 at 19:00

adrCoder · Accepted Answer · 2015-03-27T19:20:30.690

0

change

public static void main(String[] args) {
    AsteroidGame();
}

to

public static void main(String[] args) {
    AsteroidGame myAsteroidGame = new AsteroidGame();
}

then do whatever you want to do with myAsteroidGame (such as calling the method or whatever you want)

edited Mar 27 '15 at 19:20

answered Mar 27 '15 at 19:02

adrCoder

3,145
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score 0 · Answer 3 · answered Mar 27 '15 at 19:16

This was the fix:

package asteroidgame;

import blobmx.BlobGUI;
import blobmx.SandBox;
import blobmx.SandBoxMode;
import java.util.Random;


public class AsteroidGame implements BlobGUI{

private static final Random random = new Random();
public static final SandBox sb = new SandBox();

public static void main(String[] args) {
    AsteroidGame newgame = new AsteroidGame();
}    
public AsteroidGame(){ 
    //SandBox sb = new SandBox();
    sb.setSandBoxMode(SandBoxMode.FLOW);
    sb.setFrameRate(66);
    sb.init(this);
}

non static variable this cannot be referenced from a static context

3 Answers3