boxtest.java

《Java面向对象程序设计》例子源代码.轻松学习书本.

//BoxTest.java
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
class Box{
	private double length;
	private double width;
	private double high;
	public Box(){
		length=1;
		width=1;
		high=1;
	}
	public Box(double a,double b,double c){
		if(a<=0||b<=0||c<=0){
			System.out.println("invalid input");
			System.exit(0);
		}
		else{
			length=a;
			width=b;
			high=c;
		}
	}
	public double getVolume(){
		return(length*width*high);
	}
	public double getLength(){
		return length;
	}
	public double getWidth(){
		return width;
	}
	public double getHigh(){
		return high;
	}
}
public class BoxTest{
	public static void main(String args[]){
		Box box=new Box(1.5,2.4,3);
		DecimalFormat twoDigits=new DecimalFormat("0.00");
		String output="The length of box is:"+twoDigits.format(box.getLength())
				           +"\nThe width of box is:"+twoDigits.format(box.getWidth())
				           +"\nThe high of box is:"+twoDigits.format(box.getHigh())
				           +"\nThe volume of box is:"+twoDigits.format(box.getVolume());
		JOptionPane.showMessageDialog(null,output,"Box Test",JOptionPane.INFORMATION_MESSAGE);
		System.exit(0);
	}
}