class X {
    int x = 0;
    int y = 1;

    int set(int x, int y) {
        this.x = x;
        this.y = y;
        x = 1;
        y = 0;
        return x;
    }

    public static void main(String[] args) { 
        X obj = new X();
        int v = 3;
        int w = 4;
        v = obj.set(v, w);
        /* this point */
    }
}

class Body {
    int id;                         // its unique identifier
    String name;                    // its name

    /* instance variable orbits refers to the Body around which it orbits */
 
    static int nextId = 0;          // next identifier to use
 
    Body() {}                       // default constructor
 
    /* constructor Body(name, orbits) initializes a new Body object
       by setting its unique identifier to the next identifier to use,
       and initializing its name and the Body around which it orbits */
 
    /* instance method getId returns its unique identifier */
 
    /* instance method putName(name) sets its name */
 
    /* class method numberOfBodies returns the number of Body objects 
       created so far */
}

1. declaring the instance variable orbits,
2. defining the constructor Body(name, orbits),
3. defining the instance method getId(),
4. defining the instance method putName(name) and
5. defining the class method numberOfBodies.

class Point {
    int x;                     // its x-coordinate
    int y;                     // its y-coordinate
 
    private static int n = 0;  // number of Points created
 
    Point(int x, int y) {
        this.x = x;
        this.y = y;
        n++;
    }
 
    static int numberOfPointsCreated() {
        return n;
    }
}

class Color {
    String name;    // its name
    int intensity;  // its intensity
 
    Color(String name, int intensity) {
        this.name = name;
        this.intensity = intensity;
    }
}

class ColoredCircle {
    Point origin; // its origin
    int radius;   // its radius
    Color color;  // its color
 
    ColoredCircle(Point origin, int radius, Color color) {
        this.origin = origin;
        this.radius = radius;
        this.color = color;
    }
 
    ColoredCircle setOrigin(Point origin) { 
        this.origin = origin;
        return this;
    }
 
    public static void main(String[] args) {
        
        /* create a ColoredCircle object named myColoredCircle
           with x-coordinate 5, y-coordinate 6, radius 7,
           color red and color intensity 8 */
 
        int myRadius;
 
        /* initialize myRadius to myColoredCircle's radius */
 
        Point newOrigin;
 
        /* instantiate and initialize Point object named
           newOrigin with x-coordinate 9 and y-coordinate 10 */
 
        /* change myColoredCircle's origin to newOrigin using
           setOrigin */
 
        int numberOfPointsCreated;
 
        /* initialize numberOfPointsCreated to the number of Points 
           created so far using numberOfPointsCreated */
    }
}

1. creating a ColoredCircle object named myColoredCircle with x-coordinate 5, y-coordinate 6, radius 7, color red and color intensity 8,
2. initializing myRadius to myColoredCircle's radius,
3. instantiating and initializing Point object named newOrigin with x-coordinate 9 and y-coordinate 10,
4. changing myColoredCircle's origin to newOrigin using setOrigin and
5. initializing numberOfPointsCreated to the number of Points created so far using numberOfPointsCreated.