9.1

public class J9_1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Rectangle a = new Rectangle(3.5,35.9);
		
		System.out.println("width:"+a.width+" height "+a.height+" Area: "+a.getArea()+" Perimeter: "+a.getPerimeter());
		
		
		Rectangle b = new Rectangle(4,40);
		
		System.out.println(" width1 "+b.width+" height1 "+b.height+"Area1:"+b.getArea()+" Perimeter1 "+b.getPerimeter());
		
		
	}

}

class Rectangle{
	
	double width=1;
	double height=1;
	
	Rectangle(){
		
	}
	
	Rectangle(double newWidth,double newHeight){
		width= newWidth;
		height= newHeight;
	}
	
	double getArea() {
		return width*height;
	}
	
	double getPerimeter() {
		return width*2+height*2;
	}
}
 

9.2

public class J9_2 {

	public static void main(String []args) {
		
		Stock a = new Stock("ORCL","Oracle Corporation");
		a.previousClosingPrice=34.5;
		a.currentPrice=34.35;
		System.out.printf("The change percent is %5.2f%%\n",a.getChangePercent() * 100);
		
	}
}

class Stock{
	String symbol;
	String name;
	double previousClosingPrice;
	double currentPrice;
	
	Stock(String newSymbol,String newName){
		symbol = newSymbol;
		name = newName;
		
	}
	
	double getChangePercent() {
		double changePercent = (currentPrice - previousClosingPrice) / previousClosingPrice;
		return changePercent;
	}
	
}