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Thread: Instance method

  1. #1
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    Default Instance method

    public class Rectangle {
    private final int width = 0;
    private final int height = 0;
    public Point origin;

    // use:
    public Rectangle() {
    origin = new Point(0, 0);

    //use
    }
    public Rectangle(Point p) {
    origin = p;
    }
    public Rectangle(int w, int h) {
    origin = new Point(0, 0);
    width = w;
    height = h;
    }
    public Rectangle(Point p, int w, int h) {
    origin = p;
    width = w;
    height = h;
    }

    //
    public void move(int x, int y) {
    origin.x = x;
    origin.y = y;
    }

    //
    public int getArea() {
    return width * height;
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Instance method

    cannot find symbol
    The compiler can not find the variable or method named in the error message. Check that it exists and is spelled correctly.

    double cannot be dereferenced
    primitives do NOT have methods.
    int x = 1;
    x.getIt(); //  illegal, int do not have methods

    Check if there is a reference to a instance of a class that should be used where the double is.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    JohnJohnson123 (October 27th, 2013)

  4. #3
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    Default Re: Instance method

    Thanks Norm.

    I don't get it. I'm trying to turn x into a string. And x is all over the place.

    There are a lot of problems in this code.

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Instance method

    turn x into a string
    To make x a String, put it in "s
    String anX = "x"; // put x in a String
    If you don't understand my answer, don't ignore it, ask a question.

  6. The Following User Says Thank You to Norm For This Useful Post:

    JohnJohnson123 (October 27th, 2013)

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