java小程序师哥师姐帮忙，谢谢．

[Dream_1986]

画五角星，
用JAVA写的代码来完成，不知道怎么编写．

[zbl0201]

 
import java.util.*; 
public class Scan { 
public static void main(String[] args) { 
Scanner scann = new Scanner(System.in); 
int i = scann.nextInt(); 
System.out.print(i); 
} 

} 

在1.6下没问题
你在1.4下试试

[zbl0201]

不好意思 发错了！！

[hivvyeah]

/*
 * MainFrame.java
 *
 * Created on 2007年10月24日, 下午5:04
 */

package pentacle2;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.math.*;

/**
 *
 * @author  qhj
 */
public class MainFrame extends javax.swing.JFrame {
    
    /** Creates new form MainFrame */
    public MainFrame() {
        initComponents();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" 生成的代码 ">                          
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );
        pack();
    }// </editor-fold>                        
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainFrame().setVisible(true);
            }
        });
    }
    
    // 变量声明 - 不进行修改                     
    // 变量声明结束                   

    public void paint(Graphics g) {
        
        super.paint(g);
        int rectHeight,y ;
        int rectWidth, x ;
        
        
        
        Graphics2D g2 = (Graphics2D) g;
        g2.setPaint(Color.black);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        
        
        Rectangle rectWindow = getContentPane().getBounds(); //窗口的大小
        
        Point2D.Double origin = new Point2D.Double(rectWindow.x+rectWindow.width / 2f,
                rectWindow.y+rectWindow.height / 2f);//五角星的原点
        
        PolarCoordinate plc = new PolarCoordinate(origin);//新建个极座标系
        
        double rad = (rectWindow.x < rectWindow.y)?(rectWindow.width * 0.6)/2.0:(rectWindow.height * 0.6)/2.0; //五角星的外接圆半径
        
        Point2D.Double points[] = new Point2D.Double[5];
       
        double angle = 0;
        
        for(int i = 1 ; i <=5; i++ )
        {
            points[i-1] = (Point2D.Double) plc.toCartesianWithAngle(rad, angle);
            angle += 360.0/5;
        }
        
        
        GeneralPath pentacle = new GeneralPath(GeneralPath.WIND_NON_ZERO,5);
                                                    
        pentacle.moveTo(points[0].getX(), points[0].getY());
        pentacle.lineTo(points[3].getX(), points[3].getY());
        pentacle.lineTo(points[1].getX(), points[1].getY());
        pentacle.lineTo(points[4].getX(), points[4].getY());
        pentacle.lineTo(points[2].getX(), points[2].getY());        
        pentacle.closePath();
       
        g2.setStroke(new BasicStroke(2.0f));
        x = (int)pentacle.getBounds().getX();
        y = (int)pentacle.getBounds().getX();
        rectWidth = (int)pentacle.getBounds().getWidth();
        
        GradientPaint redtowhite = new GradientPaint(x,y,Color.RED,x+rectWidth-5, y,Color.white);
        g2.setPaint(redtowhite);
        g2.fill(pentacle);
        
       
     
       
         
        
    }
    
    
    
   
}

class PolarCoordinate
{
    private Point2D.Double origin = new Point2D.Double();
    
    public PolarCoordinate(Point2D.Double origin)
    {
        this.origin.setLocation(origin);
    }
    
    public PolarCoordinate(double x, double y)
    {
        origin.setLocation(x, y);
    }
    
    public Point2D toCartesianWithAngle(double radius, double angleInAngle)
    {
        Point2D.Double result = new Point2D.Double();     
         return toCartesianWithRadians(radius, angleInAngle*Math.PI/180);
       
    }
    
    public Point2D toCartesianWithRadians(double radius, double angleInRadians)
    {
        Point2D.Double result = new Point2D.Double();
        result.setLocation(origin.getX()+Math.cos(angleInRadians)*radius, origin.getY()+Math.sin(angleInRadians)*radius);
        return result;
    }
    
    
    
}

[hivvyeah]

能用记得结贴,给分哦

[Dream_1986]

呵呵,记得记得,谢了....

[Dream_1986]

第一次给分,给几分呢???
呵呵,想想...

[沉沦]

..........?????是对的么??...1.6上面..怎么显示一大堆错误啊。.

[hivvyeah]

是在netbeans里面做的.
运行过的, 没问题.
里面有netbeans生成的代码.

如果是其它的ide, 重写下 public void pain(Graphics g);
还有复制下那个class PolarCoordinate

[Dream_1986]

在EditPlus中运行，注释顶上面的
／／package pentacle2;
就ＯＫ了

[Dream_1986]

不过觉得有点复杂，自己也编了一个就是的出的五角星不规范．．．．

[hivvyeah]

就是 找个假想圆, 把它分五份. 五个分点转成笛卡尔坐标, 然后把五个点连起来.

我是用极坐标转的