driver.java

Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套 代码

import javax.swing.JFrame;
import java.awt.TextArea;

/** Trig Table Program  (Figure 10.19)
 *  Author: David Riley
 *  Date: January, 2005
 */
public class Driver  {
	private JFrame window;
	private TextArea degreePane, sinePane, cosinePane;

	public Driver()   {
		window = new JFrame("Table of sine and cosine");
		window.setBounds(10, 10, 300, 300);
		window.setVisible(true);
		window.setLayout(null);
		degreePane = new TextArea();
		degreePane.setBounds(10, 20, 50, 240);
		window.add(degreePane, 0);
		sinePane = new TextArea();
		sinePane.setBounds(70, 20, 100, 240);
		window.add(sinePane, 0);
		cosinePane = new TextArea();
		cosinePane.setBounds(180, 20, 100, 240);
		window.add(cosinePane, 0);
		displayTable();
		window.repaint();
	}
	
	/**	post:	degreePane, sinePane and cosinePane contain s table of
	 *	  		sine and cosine values beginning with 0 degrees through 
	 *	  		90 degrees in 10 degree increments.  
	 */
	private void displayTable( )   {
		int degrees = 0;
		degreePane.append("Deg. \n");
		degreePane.append("---- \n");
		sinePane.append("Sine \n");
		sinePane.append("------- \n");
		cosinePane.append("Cosine \n");
		cosinePane.append("------- \n");
		do {
			degreePane.append( degrees + "\n" );
			sinePane.append( Math.sin(degrees/180.*Math.PI) + "\n" );
				// Math trig functions use radian measures for angles
			cosinePane.append( Math.cos(degrees/180.*Math.PI) + "\n"  );
			degrees = degrees + 10;
		} while (degrees != 100);
	}
}