java/examples/Basics/Objects/Inheritance/applet/Inheritance.java

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+import processing.core.*; 
+
+import java.applet.*; 
+import java.awt.*; 
+import java.awt.image.*; 
+import java.awt.event.*; 
+import java.io.*; 
+import java.net.*; 
+import java.text.*; 
+import java.util.*; 
+import java.util.zip.*; 
+import java.util.regex.*; 
+
+public class Inheritance extends PApplet {
+
+/**
+ * Inheritance
+ * 
+ * A class can be defined using another class as a foundation. In object-oriented
+ * programming terminology, one class can inherit fi elds and methods from another. 
+ * An object that inherits from another is called a subclass, and the object it 
+ * inherits from is called a superclass. A subclass extends the superclass.
+ */
+
+SpinSpots spots;
+SpinArm arm;
+
+public void setup() 
+{
+  size(200, 200);
+  smooth();
+  arm = new SpinArm(width/2, height/2, 0.01f);
+  spots = new SpinSpots(width/2, height/2, -0.02f, 33.0f);
+}
+
+public void draw() 
+{
+  background(204);
+  arm.update();
+  arm.display();
+  spots.update();
+  spots.display();
+}
+
+class Spin 
+{
+  float x, y, speed;
+  float angle = 0.0f;
+  Spin(float xpos, float ypos, float s) {
+    x = xpos;
+    y = ypos;
+    speed = s;
+  }
+  public void update() {
+    angle += speed;
+  }
+}
+
+class SpinArm extends Spin 
+{
+  SpinArm(float x, float y, float s) {
+    super(x, y, s);
+  }
+  public void display() {
+    strokeWeight(1);
+    stroke(0);
+    pushMatrix();
+    translate(x, y);
+    angle += speed;
+    rotate(angle);
+    line(0, 0, 66, 0);
+    popMatrix();
+  }
+}
+
+class SpinSpots extends Spin 
+{
+  float dim;
+  SpinSpots(float x, float y, float s, float d) {
+    super(x, y, s);
+    dim = d;
+  }
+  public void display() {
+    noStroke();
+    pushMatrix();
+    translate(x, y);
+    angle += speed;
+    rotate(angle);
+    ellipse(-dim/2, 0, dim, dim);
+    ellipse(dim/2, 0, dim, dim);
+    popMatrix();
+  }
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "Inheritance" });
+  }
+}