java讀秒代碼 java 秒

求java小游戲源代碼

表1. CheckerDrag.java

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// CheckerDrag.javaimport java.awt.*;import java.awt.event.*;public class CheckerDrag extends java.applet.Applet{ // Dimension of checkerboard square. // 棋盤上每個(gè)小方格的尺寸 final static int SQUAREDIM = 40; // Dimension of checkerboard -- includes black outline. // 棋盤的尺寸 – 包括黑色的輪廓線 final static int BOARDDIM = 8 * SQUAREDIM + 2; // Dimension of checker -- 3/4 the dimension of a square. // 棋子的尺寸 – 方格尺寸的3/4 final static int CHECKERDIM = 3 * SQUAREDIM / 4; // Square colors are dark green or white. // 方格的顏色為深綠色或者白色 final static Color darkGreen = new Color (0, 128, 0); // Dragging flag -- set to true when user presses mouse button over checker // and cleared to false when user releases mouse button. // 拖動(dòng)標(biāo)記 --當(dāng)用戶在棋子上按下鼠標(biāo)按鍵時(shí)設(shè)為true， // 釋放鼠標(biāo)按鍵時(shí)設(shè)為false boolean inDrag = false; // Left coordinate of checkerboard's upper-left corner. // 棋盤左上角的左方向坐標(biāo) int boardx; // Top coordinate of checkerboard's upper-left corner. //棋盤左上角的上方向坐標(biāo) int boardy; // Left coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原點(diǎn)(左上角)的左方向坐標(biāo) int ox; // Top coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原點(diǎn)(左上角)的上方向坐標(biāo) int oy; // Left displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按鍵時(shí)的鼠標(biāo)坐標(biāo)與棋子矩形原點(diǎn)之間的左方向位移 int relx; // Top displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按鍵時(shí)的鼠標(biāo)坐標(biāo)與棋子矩形原點(diǎn)之間的上方向位移 int rely; // Width of applet drawing area. // applet繪圖區(qū)域的寬度 int width; // Height of applet drawing area. // applet繪圖區(qū)域的高度 int height; // Image buffer. // 圖像緩沖 Image imBuffer; // Graphics context associated with image buffer. // 圖像緩沖相關(guān)聯(lián)的圖形背景 Graphics imG; public void init () { // Obtain the size of the applet's drawing area. // 獲取applet繪圖區(qū)域的尺寸 width = getSize ().width; height = getSize ().height; // Create image buffer. // 創(chuàng)建圖像緩沖 imBuffer = createImage (width, height); // Retrieve graphics context associated with image buffer. // 取出圖像緩沖相關(guān)聯(lián)的圖形背景 imG = imBuffer.getGraphics (); // Initialize checkerboard's origin, so that board is centered. // 初始化棋盤的原點(diǎn)，使棋盤在屏幕上居中 boardx = (width - BOARDDIM) / 2 + 1; boardy = (height - BOARDDIM) / 2 + 1; // Initialize checker's rectangle's starting origin so that checker is // centered in the square located in the top row and second column from // the left. // 初始化棋子矩形的起始原點(diǎn)，使得棋子在第一行左數(shù)第二列的方格里居中 ox = boardx + SQUAREDIM + (SQUAREDIM - CHECKERDIM) / 2 + 1; oy = boardy + (SQUAREDIM - CHECKERDIM) / 2 + 1; // Attach a mouse listener to the applet. That listener listens for // mouse-button press and mouse-button release events. // 向applet添加一個(gè)用來監(jiān)聽鼠標(biāo)按鍵的按下和釋放事件的鼠標(biāo)監(jiān)聽器 addMouseListener (new MouseAdapter () { public void mousePressed (MouseEvent e) { // Obtain mouse coordinates at time of press. // 獲取按鍵時(shí)的鼠標(biāo)坐標(biāo) int x = e.getX (); int y = e.getY (); // If mouse is over draggable checker at time // of press (i.e., contains (x, y) returns // true), save distance between current mouse // coordinates and draggable checker origin // (which will always be positive) and set drag // flag to true (to indicate drag in progress). // 在按鍵時(shí)如果鼠標(biāo)位于可拖動(dòng)的棋子上方 // （也就是contains (x, y)返回true），則保存當(dāng)前 // 鼠標(biāo)坐標(biāo)與棋子的原點(diǎn)之間的距離（始終為正值）并且 // 將拖動(dòng)標(biāo)志設(shè)為true（用來表明正處在拖動(dòng)過程中） if (contains (x, y)) { relx = x - ox; rely = y - oy; inDrag = true; } } boolean contains (int x, int y) { // Calculate center of draggable checker. // 計(jì)算棋子的中心位置 int cox = ox + CHECKERDIM / 2; int coy = oy + CHECKERDIM / 2; // Return true if (x, y) locates with bounds // of draggable checker. CHECKERDIM / 2 is the // radius. // 如果(x, y)仍處于棋子范圍內(nèi)則返回true // CHECKERDIM / 2為半徑 return (cox - x) * (cox - x) + (coy - y) * (coy - y) CHECKERDIM / 2 * CHECKERDIM / 2; } public void mouseReleased (MouseEvent e) { // When mouse is released, clear inDrag (to // indicate no drag in progress) if inDrag is // already set. // 當(dāng)鼠標(biāo)按鍵被釋放時(shí)，如果inDrag已經(jīng)為true， // 則將其置為false（用來表明不在拖動(dòng)過程中） if (inDrag) inDrag = false; } }); // Attach a mouse motion listener to the applet. That listener listens // for mouse drag events. //向applet添加一個(gè)用來監(jiān)聽鼠標(biāo)拖動(dòng)事件的鼠標(biāo)運(yùn)動(dòng)監(jiān)聽器 addMouseMotionListener (new MouseMotionAdapter () { public void mouseDragged (MouseEvent e) { if (inDrag) { // Calculate draggable checker's new // origin (the upper-left corner of // the checker rectangle). // 計(jì)算棋子新的原點(diǎn)（棋子矩形的左上角） int tmpox = e.getX () - relx; int tmpoy = e.getY () - rely; // If the checker is not being moved // (at least partly) off board, // assign the previously calculated // origin (tmpox, tmpoy) as the // permanent origin (ox, oy), and // redraw the display area (with the // draggable checker at the new // coordinates). // 如果棋子（至少是棋子的一部分）沒有被 // 移出棋盤，則將之前計(jì)算的原點(diǎn) // (tmpox, tmpoy)賦值給永久性的原點(diǎn)(ox, oy)， // 并且刷新顯示區(qū)域（此時(shí)的棋子已經(jīng)位于新坐標(biāo)上） if (tmpox boardx tmpoy boardy tmpox + CHECKERDIM boardx + BOARDDIM tmpoy + CHECKERDIM boardy + BOARDDIM) { ox = tmpox; oy = tmpoy; repaint (); } } } }); } public void paint (Graphics g) { // Paint the checkerboard over which the checker will be dragged. // 在棋子將要被拖動(dòng)的位置上繪制棋盤 paintCheckerBoard (imG, boardx, boardy); // Paint the checker that will be dragged. // 繪制即將被拖動(dòng)的棋子 paintChecker (imG, ox, oy); // Draw contents of image buffer. // 繪制圖像緩沖的內(nèi)容 g.drawImage (imBuffer, 0, 0, this); } void paintChecker (Graphics g, int x, int y) { // Set checker shadow color. // 設(shè)置棋子陰影的顏色 g.setColor (Color.black); // Paint checker shadow. // 繪制棋子的陰影 g.fillOval (x, y, CHECKERDIM, CHECKERDIM); // Set checker color. // 設(shè)置棋子顏色 g.setColor (Color.red); // Paint checker. // 繪制棋子 g.fillOval (x, y, CHECKERDIM - CHECKERDIM / 13, CHECKERDIM - CHECKERDIM / 13); } void paintCheckerBoard (Graphics g, int x, int y) { // Paint checkerboard outline. // 繪制棋盤輪廓線 g.setColor (Color.black); g.drawRect (x, y, 8 * SQUAREDIM + 1, 8 * SQUAREDIM + 1); // Paint checkerboard. // 繪制棋盤 for (int row = 0; row 8; row++) { g.setColor (((row 1) != 0) ? darkGreen : Color.white); for (int col = 0; col 8; col++) { g.fillRect (x + 1 + col * SQUAREDIM, y + 1 + row * SQUAREDIM, SQUAREDIM, SQUAREDIM); g.setColor ((g.getColor () == darkGreen) ? Color.white : darkGreen); } } } // The AWT invokes the update() method in response to the repaint() method // calls that are made as a checker is dragged. The default implementation // of this method, which is inherited from the Container class, clears the // applet's drawing area to the background color prior to calling paint(). // This clearing followed by drawing causes flicker. CheckerDrag overrides // update() to prevent the background from being cleared, which eliminates // the flicker. // AWT調(diào)用了update()方法來響應(yīng)拖動(dòng)棋子時(shí)所調(diào)用的repaint()方法。該方法從 // Container類繼承的默認(rèn)實(shí)現(xiàn)會(huì)在調(diào)用paint()之前，將applet的繪圖區(qū)域清除 // 為背景色，這種繪制之后的清除就導(dǎo)致了閃爍。CheckerDrag重寫了update()來 // 防止背景被清除，從而消除了閃爍。 public void update (Graphics g) { paint (g); }}

java代碼功能

Java 是一種編程語言,它本身的作用是通過編寫應(yīng)用程序，幫助人們解決日常工作、生活和學(xué)習(xí)遇到的問題。

一些常見的java功能代碼。如復(fù)制文件夾及文件到指定目錄，遍歷指定盤符所有文件，檢索字符串是否符合指定要求。

用JAVA怎么寫一個(gè)秒殺器。求具體代碼

最好不要用java寫秒殺器，因?yàn)槟憔退阌?httpclient 拿到的也是未經(jīng)過渲染的html頁面，很多頁面js都沒有加載，你根本不知道渲染之后的頁面長什么樣子，你最好學(xué)學(xué)木魚的火車票搶票助手，他用的是 firefox 的插件 scriptish 來寫搶票腳本，其實(shí)搶票跟秒殺是一個(gè)原理的，我第一個(gè)秒的程序就是照著他的程序改的，用這個(gè)上手也比較容易，但是要求你對(duì)javascript比較熟悉，不過比用java實(shí)現(xiàn)靠譜多了

Java編程，填寫下面的代碼

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++) {

// 【代碼5】

// //將i轉(zhuǎn)換為char類型，執(zhí)行people.printLetter()方法，如果出現(xiàn)異常則捕獲，并輸出異常的錯(cuò)誤信息！

people.printLetter((char) i);

}

for (int i = 0; i 128; i++) {

// 【代碼6】 //將i轉(zhuǎn)換為char類型，執(zhí)行people. printDigit

// ()方法，如果出現(xiàn)異常則捕獲，并輸出異常的錯(cuò)誤信息！

people.printDigit((char) i);

}

}

}

幫忙寫下Java代碼

你好，按照你的要求補(bǔ)充的代碼如下

// 【代碼1】 // 實(shí)現(xiàn)totalSalesByYear( )方法

public double totalSalesByYear() {

return 5000;

}

// 【代碼2】 // 實(shí)現(xiàn)totalSalesByYear( )方法

public double totalSalesByYear() {

return 3000;

}

// 【代碼3】 // 實(shí)現(xiàn)totalSalesByYear( )方法

public double totalSalesByYear() {

return 1000;

}

// 【代碼4】 // 計(jì)算商店年銷售額totalSales

for (ComputeTotalSales good : goods) {

totalSales += good.totalSalesByYear();

}

java中讀秒的類

System.currentTimeMillis()

用這個(gè)函數(shù)，這個(gè)函數(shù)返回long。用于表示從1970年1月1日0點(diǎn)整到調(diào)用該函數(shù)的這一時(shí)刻的毫秒數(shù)。

只需調(diào)用兩次，求差后即可得到兩次調(diào)用的該函數(shù)中間所經(jīng)歷的時(shí)間。當(dāng)然，單位是毫秒。

當(dāng)前題目：java讀秒代碼 java 秒
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