很简单，程序写给你，给分： --------------------------------------------- import java.awt.*; import javax.swing.JFrame; import java.util.Random; import java.text.DecimalFormat; public class SinDemo extends JFrame { private double cx = 1, cy = 1; private double toCx = 1, toCy = 1; private Random rnd = new Random(); private DecimalFormat df = new DecimalFormat(＂0.00＂); private SinDemo () { super(＂Sin-Demo＂); setSize(600, 600); setLocationRelativeTo(null); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); run(); } private int translateX (double x) { return (int)(x*getWidth()/Math.PI/4 + getWidth()/2); } private int translateY (double y) { return (int)(getHeight()/2 - y*getWidth()/Math.PI/4); } private double sin (double x) { return (cy * Math.sin(cx * x)); } Override public void paint (Graphics g) { super.paint(g); g.setColor(Color.BLUE); g.drawString(＂y = ＂ + df.format(cx) + ＂ * sin( ＂ + df.format(cy) + ＂ * x)＂, 50, 50); g.setColor(Color.LIGHT_GRAY); g.drawLine(0, getHeight()/2, getWidth(), getHeight()/2); g.drawLine(getWidth()/2, 0, getWidth()/2, getHeight()); g.setColor(Color.BLACK); for (double i=-Math.PI/cx; i