具体如下:
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连连看的小源码
package Lianliankan;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class lianliankan implements ActionListener
{
JFrame mainFrame; //主面板
Container thisContainer;
JPanel centerPanel,southPanel,northPanel; //子面板
JButton diamondsButton[][] = new JButton[6][5];//游戏按钮数组
JButton exitButton,resetButton,newlyButton; //退出,重列,重新开始按钮
JLabel fractionLable=new JLabel("0"); //分数标签
JButton firstButton,secondButton; //
分别记录两次62616964757a686964616fe59b9ee7ad9431333335326239被选中的按钮
int grid[][] = new int[8][7];//储存游戏按钮位置
static boolean pressInformation=false; //判断是否有按钮被选中
int x0=0,y0=0,x=0,y=0,fristMsg=0,secondMsg=0,validateLV; //游戏按钮的位置坐标
int i,j,k,n;//消除方法控制
代码(code)是程序员用开发工具所支持的语言写出来的源文件,是一组由字符、符号或信号码元以离散形式表示信息的明确的规则体系。
对于字符和Unicode数据的位模式的定义,此模式代表特定字母、数字或符号(例如 0x20 代表一个空格,而 0x74 代表字符“t”)。一些数据类型每个字符使用一个字节;每个字节可以具有 256 个不同的位模式中的一个模式。
在计算机中,字符由不同的位模式(ON 或 OFF)表示。每个字节有 8 位,这 8 位可以有 256 种不同的 ON 和 OFF 组合模式。对于使用 1 个字节存储每个字符的程序,通过给每个位模式指派字符可表示最多 256 个不同的字符。2 个字节有 16 位,这 16 位可以有 65,536 种唯一的 ON 和 OFF 组合模式。使用 2 个字节表示每个字符的程序可表示最多 65,536 个字符。
单字节代码页是字符定义,这些字符映射到每个字节可能有的 256 种位模式中的每一种。代码页定义大小写字符、数字、符号以及 !、@、#、% 等特殊字符的位模式。每种欧洲语言(如德语和西班牙语)都有各自的单字节代码页。
虽然用于表示 A 到 Z 拉丁字母表字符的位模式在所有的代码页中都相同,但用于表示重音字符(如"é"和"á")的位模式在不同的代码页中却不同。如果在运行不同代码页的计算机间交换数据,必须将所有字符数据由发送计算机的代码页转换为接收计算机的代码页。如果源数据中的扩展字符在接收计算机的代码页中未定义,那么数据将丢失。
如果某个数据库为来自许多不同国家的客户端提供服务,则很难为该数据库选择这样一种代码页,使其包括所有客户端计算机所需的全部扩展字符。而且,在代码页间不停地转换需要花费大量的处理时间。
题目:一球从100米高度自由落下,每次落地后反跳回原高度的一半;再落下,求它在 第10次落地时,共经过多少米?第10次反弹多高?
这个题目,下面我会贴出来两种代码。其实这个题目,我烦了简单计算,想搞得有趣味性一点,结果耽误了好几天时间,最后发现搞的也不好。
先第一种,为了解题而解题。
==== Main.java ====
public class Main {
private double TotalHeight = 100;
private double CurHeight = 50;
public void drop(int times) {
if ((times - 1) == 0) {
return;
}
setTotalHeight(getTotalHeight() + 2 * getCurHeight());
setCurHeight(getCurHeight() / 2);
drop(times - 1);
}
public double getTotalHeight() {
return TotalHeight;
}
public void setTotalHeight(double totalHeight) {
TotalHeight = totalHeight;
}
public double getCurHeight() {
return CurHeight;
}
public void setCurHeight(double curHeight) {
CurHeight = curHeight;
}
public static void main(String[] args) {
Main main = new Main();
main.drop(2);
System.out.println("Total height is " +
main.getTotalHeight());
System.out.println("Current height is " +
main.getCurHeight());
}
}
==== 然后是第二种 =====
==== Main.java ====
package main;
import javax.swing.JFrame;
import panel.BallPanel;
import time.Delay;
public class MainFrame extends JFrame {
public MainFrame(String title) {
super(title);
}
public static void main(String[] args) {
Delay delay = new Delay();
MainFrame frame = new MainFrame("Hello JFrame");
BallPanel ballPanel = new BallPanel();
frame.add(ballPanel);
frame.setSize(500, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
delay.initDelay();
ballPanel.setDelay(delay.getDelay());
ballPanel.loopDrop(0);
}
}
==== Delay.java ====
package time;
public class Delay {
public void initDelay() {
int g = 10;
int i = 0;
double s, t, t0 = 0.0;
delay = new int[100];
for (s = 100; s 10100; s += 100) {
t = Math.sqrt(2 * s / g);
delay[i++] = (int) ((t - t0) * 100);
t0 = t;
}
}
public int[] getDelay() {
return delay;
}
private int delay[];
}
==== BallPanel.java ====
package panel;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
public class BallPanel extends JPanel {
public BallPanel() {
super();
}
public void paint(Graphics g) {
g.clearRect(0, 0, this.getWidth(), this.getHeight());
g.setColor(Color.BLUE);
g.fillOval(250, ballCenter, 30, 30);
}
public void loopDrop(int height) {
int i;
if (this.height == height) { // At bottom
for (i = 0; i targetHeight; i += MUL) {
ballCenter = this.height - i;
this.repaint();
try {
Thread.sleep(delay[(targetHeight - i - 1) / MUL]);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
loopDrop(this.height - i);
} else { // At top
for (i = height; i this.height; i += MUL) {
ballCenter = i;
this.repaint();
try {
Thread.sleep(delay[(i - height) / MUL]);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
targetHeightV = targetHeightV / 2;
targetHeight = targetHeightV;
if (targetHeight != 0) {
loopDrop(i);
}
}
}
public void setDelay(int delay[]) {
this.delay = delay;
}
private int extracted() {
return 100 * MUL;
}
private int targetHeight = extracted();
private int targetHeightV = extracted();
private int ballCenter = 0;
private int height = extracted();
private int delay[];
private final int MUL = 4;
}
其实所谓的第二种,是用的JFrame在JPanel上画图,直观的展示出来每次弹起来的效果。因为100像素实在太小了,所以我做了一个变量MUL,相
当于是等比例扩大的效果。问题就是弹不到10次距离就用光了,所以。。。。。权当娱乐了。。当然可以等比例在放大,例如100M看成是10000像素,这
样能多弹几次。这个程序,最后球就在那里不动了,程序不会自己退出。
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Painter extends JFrame{
/**
*
*/
private static final long serialVersionUID = 8160427604782702376L;
CanvasPanel canvas = new CanvasPanel();;
public Painter() {
super("Star");
this.add(canvas);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setResizable(false);
this.setLocationRelativeTo(null);
this.setVisible(true);
}
public static void main(String[] args) {
new Painter();
}
}
class CanvasPanel extends JPanel implements ActionListener{
/**
*
*/
private static final long serialVersionUID = -4642528854538741028L;
private JButton[] btn = new JButton[4];
private String[] btn_name = {"+", "-", "R", "L"};
private int center_x = 200, center_y = 200, radius = 100, degree = 0;
public CanvasPanel() {
this.setPreferredSize(new Dimension(400, 500));
this.setLayout(null);
for(int i = 0; i 4; i++) {
btn[i] = new JButton(btn_name[i]);
btn[i].setBounds(160 + i * 60, 425, 50, 50);
btn[i].addActionListener(this);
this.add(btn[i]);
}
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
for(int i = 0; i 5; i++) {
g.drawLine( (int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i))),
(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i))),
(int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i + 144))),
(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i + 144))));
}
}
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getActionCommand() == "+") {
if(radius 200)
radius += 2;
repaint();
} else if(e.getActionCommand() == "-") {
if(radius 0)
radius -= 2;
repaint();
} else if(e.getActionCommand() == "R") {
degree = (degree + 2) % 360;
repaint();
} else if(e.getActionCommand() == "L") {
degree = (degree - 2) % 360;
repaint();
}
}
}
package com.zpp;public class Charge {
public static void main(String [] args) {
if(args.length ==0) {
System.out.println("parameter error!");
System.out.println("java com.zpp.Charge [int]");
return;
}
int min = Integer.parseInt(args[0]);
double money = 0.0;
if (min = 0) {
money =0.0;
System.out.println("not money");
} else if (min = 60) {
money = 2.0;
} else {
money = 2.0 + (min - 60) * 0.01;
}
System.out.println("please pay: " + money);
}
} 编译:javac -d . Charge.java运行:java com.zpp.Charge 111
不知道是否理解对了你的意思,大概写了一下:
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.io.StringWriter;
public class FileReadAndWrite {
private static final int DEFAULT_BUFFER_SIZE = 1024;
public static void main(String[] args) {
File file = new File("E:/workspace/FileIOTest/src/a.txt");
String str = file2String(file, "UTF-8");
str = str.replace('d', 'f');
string2File(str,"E:/workspace/FileIOTest/src/b.txt");
System.out.println("处理完毕");
}
/**
* 文本文件转换为指定编码的字符串
*
* @param file
* 文本文件
* @param encoding
* 编码类型
* @return 转换后的字符串
* @throws IOException
*/
public static String file2String(File file, String encoding) {
InputStreamReader reader = null;
StringWriter writer = new StringWriter();
try {
if (encoding == null || "".equals(encoding.trim())) {
reader = new InputStreamReader(new FileInputStream(file),
encoding);
} else {
reader = new InputStreamReader(new FileInputStream(file));
}
// 将输入流写入输出流
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
int n = 0;
while (-1 != (n = reader.read(buffer))) {
writer.write(buffer, 0, n);
}
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (reader != null)
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// 返回转换结果
if (writer != null)
return writer.toString();
else
return null;
}
/**
* 将字符串写入指定文件(当指定的父路径中文件夹不存在时,会最大限度去创建,以保证保存成功!)
*
* @param res
* 原字符串
* @param filePath
* 文件路径
* @return 成功标记
*/
public static boolean string2File(String res, String filePath) {
boolean flag = true;
BufferedReader bufferedReader = null;
BufferedWriter bufferedWriter = null;
try {
File distFile = new File(filePath);
if (!distFile.getParentFile().exists())
distFile.getParentFile().mkdirs();
bufferedReader = new BufferedReader(new StringReader(res));
bufferedWriter = new BufferedWriter(new FileWriter(distFile));
char buf[] = new char[1024]; // 字符缓冲区
int len;
while ((len = bufferedReader.read(buf)) != -1) {
bufferedWriter.write(buf, 0, len);
}
bufferedWriter.flush();
bufferedReader.close();
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
flag = false;
return flag;
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}
}
最简单的java代码肯定就是这个了,如下:
public class MyFirstApp
{
public static void main(String[] args)
{
System.out.print("Hello world");
}
}
“hello world”就是应该是所有学java的新手看的第一个代码了。如果是零基础的新手朋友们可以来我们的java实验班试听,有免费的试听课程帮助学习java必备基础知识,有助教老师为零基础的人提供个人学习方案,学习完成后有考评团进行专业测试,帮助测评学员是否适合继续学习java,15天内免费帮助来报名体验实验班的新手快速入门java,更好的学习java!