Question

How do you create your own class? (java methods)

Answer 1

class hello{

}

Answer 2

import java.util.*;

class Main{

public static void main(String[] args){

Scanner word=new Scanner(System.in);
System.out.println("hello:");

}

}

Answer 3

What do you want to do with it? Java classes usually have sub-fields and sub-methods to structure it, similar to how you can do

new Object().toString()

and it'll print the string representation of an object.
For example, if you wanted a video-game-like vector class, you'd do

public class Vec3 {
    public double x, y, z; // three doubles for the three coordinates
    public Vec3(double x, double y, double z) { // constructor so you can actually make the Vec3 instance
        this.x = x;
        this.y = y;
        this.z = z;
    }
    // other stuff goes here
}

So if you wanted to create a vector for a point at (3,4,5), you would do

Vec3 point = new Vec3(3, 4, 5);

You can also override methods from superclasses (all Java classes extend Object if not explicitly specified), which is most commonly used to override toString(). For example:

public class Vec3 {
    public double x, y, z; // three doubles for the three coordinates
    public Vec3(double x, double y, double z) { // constructor so you can actually make the Vec3 instance
        this.x = x;
        this.y = y;
        this.z = z;
    }
    public String toString() {
        return "[" + x + "," + y + "," + z + "]";
}

and that'll produce a string like "[3,4,5]" (given the example above with (3,4,5)).

Hope this helps!