MyWMO.java

/*
 * MyWMMO.java - 5th instantiation example.
 * 
 * 
 * 
 */


// invoke dependencies.

import java.awt.*;
// local subdirectory contains GeoRectangle class definition


class MyWMO {
	
	 private GeoRectangle rect1;	// define 4 rectangles
	 private GeoRectangle rect2 = new GeoRectangle();
	 private GeoRectangle rect3;
	private GeoRectangle rect4;

	public void MyWMO (){
		initVars(this.rect1,4,5);
}	// end MyWMO constructor

// Note: non-static method cannot be invoked by static method.
// this. reference only legal in non-static method.	
// even so, this.rect2 is not found...
public void initVars( GeoRectangle aRect, int i, int j ){
	aRect.setDims(i,j);
	System.out.println("in initVars, passed rectangle dimensions...");
	aRect.showDims();
}	// end initVars
		

//	public void main (String[] args) {		// main must be static or will not execute
	public static void main (String[] args) {
			
		GeoRectangle rect = new GeoRectangle();
		System.out.println("rect immediately after constructor invoked...");
		rect.showDims();
//		rect2.setDims(4,5);		// won't compile, rect2 not known
//		this.rect2.setDims(4,5);	// won't compile, can't use this. in static context
		GeoRectangle rect2 = new GeoRectangle();
		// MyWMN adds the following line...
//		rect2 = rect;			// create new instance
//		initVars(rect2);			// initialize var rect2

		System.out.println("rect2 immediately after rect2 values set...");
		rect2.showDims();
		System.out.println("rect immediately after rect2 values set...");
		rect.showDims();
		rect.setDims(3,4);
		System.out.println(" rect after rect.setDims reference...");
		rect.showDims();
		System.out.println(" rect 2 after rect.setDims invoked...");
		rect2.showDims();
	}	// end main method
	
}	// end MyWMO class