// 114-12.1 Example of static data and method in rectangle class. public class Class1 { public static void main (String[] args) { System.out.println("There are "+Rectangle.getObjCount()+" rectangles created so far."); Rectangle r1=new Rectangle(); // No parameters. System.out.println("r1 is "+r1.getHeight()+" by "+ r1.getLength()); System.out.println("There are "+Rectangle.getObjCount()+" rectangles created so far."); Rectangle r2=new Rectangle(5); // One parameter. System.out.println("r2 is "+r2.getHeight()+" by "+ r2.getLength()); System.out.println("There are "+Rectangle.getObjCount()+" rectangles created so far."); Rectangle r3=new Rectangle(4,6);// Two parameters. System.out.println("r3 is "+r3.getHeight()+" by "+ r3.getLength()); System.out.println("There are "+Rectangle.getObjCount()+" rectangles created so far."); } }
114-12.2 // Rectangle class with overloaded constructors. // Static variable objCounter keeps track of the number of // rectangles created far. so public class Rectangle { private static int objCounter=0; // Number of Rectangle // objects created. public static int getObjCount() { return objCounter; } // Report number of objects.
// Height and length of rectangle. int height, length; int area; // Area of rectangle. Computed whenever // height or length is changed. public Rectangle() { length=0; height=0; area=0; objCounter++; } public Rectangle(int ht) { height=ht; length=0; area=0; objCounter++; } public Rectangle(int ht, int ln) { height=ht; length=ln; area=height*length; objCounter++; } public void setLength(int ln) // Length writer. { length=ln; area=length*height; } public void setHei...