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请问一个使用fillPolygon()画国旗上的五角星的算法
给你一个五星红旗的applet，用applet查看器就可以看。其它的你自己来吧
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import java.awt.*;
import java.applet.*;
public class HongQi extends Applet{
int r1=30; //外接大圆半径
int r0=(int)(r1*Math.cos(72*Math.PI/180)); //内圆半径
// 以下是大五角星坐标
int[] xrr={
(int)0, (int)(r0*Math.cos(54*Math.PI/180)),
(int)(r1*Math.sin(72*Math.PI/180)), (int)(r0*Math.cos(18*Math.PI/180)),
(int)(r1*Math.cos(54*Math.PI/180)), (int)0,
(int)((-r1)*Math.cos(54*Math.PI/180)),(int)((-r0)*Math.cos(18*Math.PI/180)),
(int)((-r1)*Math.sin(72*Math.PI/180)),(int)((-r0)*Math.cos(54*Math.PI/180))
};
int[] yrr={
(int)-r1, (int)(-r0*Math.sin(54*Math.PI/180)),
(int)(-r1*Math.cos(72*Math.PI/180)), (int)((r0)*Math.sin(18*Math.PI/180)),
(int)((r1)*(Math.sin(54*Math.PI/180))), (int)(r0),
(int)((r1)*(Math.sin(54*Math.PI/180))), (int)((r0)*Math.sin(18*Math.PI/180)),
(int)(-r1*Math.cos(72*Math.PI/180)), (int)(-r0*Math.sin(54*Math.PI/180)),
};
int[] xrr0=new int[10]; //小五角星坐标
int[] yrr0=new int[10];
public void init(){
for (int i = 0; i xrr.length; i++) { //计算大五角星坐标平移
xrr[i]+=50;
yrr[i]+=60;
}
for (int i = 0; i xrr0.length; i++) { //计算小五角星坐标平移
xrr0[i]=xrr[i]/3;
xrr0[i]+=80;
yrr0[i]=yrr[i]/3;
yrr0[i]+=17;
}
}
public void paint(Graphics g){
g.setColor(Color.RED);
g.fillRect(0,0,300,200);
g.setColor(Color.YELLOW);
g.fillPolygon(xrr,yrr,10);
g.fillPolygon(xrr0,yrr0,10);
g.copyArea(88,25,20,20,15,18);
g.copyArea(88,25,20,20,15,38);
g.copyArea(88,25,20,20,0,58);
}
}
5! 用java编写代码怎么写
用于你只是求5的阶乘，所以没必要弄得那么麻烦，不用对被阶乘数进行判断。当然可以更加复杂一点。
public class Demo{
public static void main(String[] args){
int a = 5;
int result = 1;
for(int i = 1;i = a; i ++){
result *= a;
}
System.out.println("5!的结果是： " + result);
}
}
如何用java写这段代码？
import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;public class JEncrytion{
public static void main(String[] argv) {
try{ KeyGenerator keygenerator = KeyGenerator.getInstance("DES"); SecretKey myDesKey = keygenerator.generateKey();
Cipher desCipher; // Create the cipher
desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
// Initialize the cipher for encryption
desCipher.init(Cipher.ENCRYPT_MODE, myDesKey); //sensitive information
byte[] text = "No body can see me".getBytes();
System.out.println("Text [Byte Format] : " + text);
System.out.println("Text : " + new String(text));
// Encrypt the text
byte[] textEncrypted = desCipher.doFinal(text);
System.out.println("Text Encryted : " + textEncrypted);
// Initialize the same cipher for decryption
desCipher.init(Cipher.DECRYPT_MODE, myDesKey); // Decrypt the text
byte[] textDecrypted = desCipher.doFinal(textEncrypted);
System.out.println("Text Decryted : " + new String(textDecrypted));
}catch(NoSuchAlgorithmException e){
e.printStackTrace();
}catch(NoSuchPaddingException e){
e.printStackTrace();
}catch(InvalidKeyException e){
e.printStackTrace();
}catch(IllegalBlockSizeException e){
e.printStackTrace();
}catch(BadPaddingException e){
e.printStackTrace();
}
}
}
Java编程，填写下面的代码
class NoLowerLetterException extends Exception {
public NoLowerLetterException(String msg) {
super(msg);
}
}
class NoDigitException extends Exception {
public NoDigitException(String msg) {
super(msg);
}
}
class People {
void printLetter(char c) {
if (c = 'a' c = 'z') {
System.out.println(c);
} else {
try {
throw new NoLowerLetterException(String.valueOf(c));
} catch (NoLowerLetterException e) {
e.printStackTrace();
}
}
}
void printDigit(char c) {
if (c = '0' c = '9') {
System.out.println(c);
} else {
try {
throw new NoDigitException(String.valueOf(c));
} catch (NoDigitException e) {
e.printStackTrace();
}
}
}
}
public class ExceptionExample {
public static void main(String args[]) {
People people = new People();
for (int i = 0; i 128; i++) {
// 【代码5】
// //将i转换为char类型，执行people.printLetter()方法，如果出现异常则捕获，并输出异常的错误信息！
people.printLetter((char) i);
}
for (int i = 0; i 128; i++) {
// 【代码6】 //将i转换为char类型，执行people. printDigit
// ()方法，如果出现异常则捕获，并输出异常的错误信息！
people.printDigit((char) i);
}
}
}
怎样用java编国旗
/**
* @(#)ChinaFlag.java
* ChinaFlag Applet application
* @黑色珊瑚
* @version 1.00 08/05/12
*/
import java.awt.*;
public class ChinaFlag extends Frame {
public static void main(String[] args) {
ChinaFlag cf=new ChinaFlag();
cf.setVisible(true);
}
public ChinaFlag() {
setBounds(100,100,400,300);
setBackground(Color.RED);
}
public void paint(Graphics g) {
drawStar(g,70,100,40);
drawStar(g,140,60,12);
drawStar(g,155,86,12);
drawStar(g,155,113,12);
drawStar(g,140,140,12);
}
private void drawStar(Graphics g,int x,int y,int width) {
double[] xb={0,
0.2245139882897926f, // sin18 * tan36
1.0514622242382672f, // 1 / cos18
0.3632712640026804f, // (sin18 * cos36) * sin72
0.5877852522924731f,0, // sin36 , 0
-0.5877852522924731f, // -sin36
-0.3632712640026804f, // -(sin18 * cos36) * sin72
-1.0514622242382672f, // -1 / cos18
-0.2245139882897926f}; // -sin18 * tan36
double[] yb={-1,
-0.3090169943749474f,
-0.3090169943749474f,
0.1180339887498948f, //
0.8090169943749474f,
0.3819660112501051f,
0.8090169943749474f,
0.1180339887498948f, //
-0.3090169943749474f,
-0.3090169943749474f};
g.setColor(Color.YELLOW);
int[] x1=new int[10];
int[] y1=new int[10];
for (int i=0; i10; i++) {
x1[i]=(int)(xb[i]*width+x);
y1[i]=(int)(yb[i]*width+y);
}
g.fillPolygon(x1,y1,10);
}
}
用java写程序，求教
求采纳，代码：
import java.util.Scanner;
public class main {
public static void main(String[] arg) {
//
int NumF=0;
//负数个数
int NumZ=0;
//正数个数
double sum=0;
//数字总和
System.out.println("输入数字：");
Scanner in=new Scanner(System.in);
String st=in.nextLine();//获得输入的内容
//循环遍历数组
for(String a:st.split(" ")/*使用split分割字符串*/) {
int b = 0;
try {
b=Integer.valueOf(a);//使用Integer.valueOf();将字符串转化为数值
}catch (Exception e) {
System.out.println("发生错误，可能输入了错误的数");
e.printStackTrace();
}
//判断数字正负
if(b0) {
//如果是负数
NumF++;
//
sum=sum+b;
}else if (b0){
//如果是正数
NumZ++;
sum=sum+b;
}else if(b==0) {
//如果为0就结束程序
System.out.println(NumZ);
System.out.println(NumF);
System.out.println((double)sum/(NumF+NumZ));
}
}
}
}
当前名称：java代码写五星红旗,五星红旗编程
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