The correct way to initialize classes and stack overflow errors

Question

This may be a stupid question, but I'm getting sick of this. How do you properly initialize a class object so you can access methods and variables in it? Here's my code:

public class GenChunk {

Chunk c;
VBO vbo;

int worldSize = 64;
int var1 = 16; //x
int var2 = 16; //z
int var3 = 16; //y

public GenChunk(){
    gen();
}

public void gen(){
    c = new Chunk();
    if(c.chunkChanged == false){
        for(int i = 0; i < worldSize; i++){
            newChunk();
        }
    }
}

The line c = new Chunk() is causing the stack overflow error., I realize why (because its creating new instances of it and taking up more and more memory), but as soon as I initialize it in the constructor or just do Chunk c = new Chunk(), at the top below public class GenChunk { I get another stack overflow error! If I don't initalize the class, I get a null pointer (obviously). What is wrong with my code? I must be overlooking something, but I can't figure it out!

Here is my Chunk class, it has a few empty methods:

public class Chunk {

public boolean chunkChanged = false;
boolean enteredGame = true;

public int chunkID = 0;

Player player;

float var1;
float var2;
float var3;

public Chunk(){
    update();
}

private void update(){
    setUp();
}

private void setUp(){
    if(enteredGame){
        new GenChunk();
    }
}

private void checkChunkRebuild(int id){

}

private void rebuildOnPlayerChange(int id){
    if(enteredGame && chunkChanged == true){

    }
}

private float getPlayerX(){
    return player.var1;
}

private float getPlayerZ(){
    return player.var2;
}

private float getPlayerY(){
    return player.var3;
}

}

Answer 1

Your Chunk class is creating a new instance of GenChunk, which in turn is creating a new instance of the Chunk class, creating an infinite loop until the stack overflow occurs.

private void setUp(){
if(enteredGame){
    new GenChunk();
    }
}

is where it starts, and it continues at

public void gen(){
    c = new Chunk();
if(c.chunkChanged == false){
    for(int i = 0; i < worldSize; i++){
        newChunk();
    }
  }
}

which is called in the GenChunk constructor.