java源代碼閱讀

『壹』 java閱讀源碼，大量英文注釋閱讀不方便，求集成idea裡面的翻譯java注釋由英文翻譯為中文的工具。

學會在idea（eclipse）中閱讀、調試源碼，是java程序員必不可少的一項技能。

在idea中配完環境後，默認其實也是能夠對jdk的源碼進行debug調試的。但是無法在源碼中添加自己的注釋，無法添加自己的理解。如果乾瞪眼看的話，可能過段時間，就忘記了。下面就介紹下，如何在jdk源碼中為所欲為，像在我們自己的代碼中一樣寫注釋、調代碼：

打開idea，選擇Project->File->Project Structure->SDKs->Sourcepath，初始狀態如下圖 ：

這時，再重新打開jdk的源碼類，我們就可以在源java文件中，添加自己的注釋了。

一定注意：添加註釋時，一定不要新加一行寫注釋。最好在一行代碼的後面，使用//進行注釋。否則行號和真正的jre中編譯後的代碼行號對應不上，如果對源碼debug時，會出現代碼運行和行號不匹配的情況

『貳』 鎻愰珮浠ｇ爜闃呰昏兘鍔涚殑鎶宸ф湁鍝浜涳紵

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『叄』 求用JAVA編寫俄羅斯方塊游戲的源代碼

俄羅斯方塊——java源代碼提供 import java.awt.*; import java.awt.event.*; //俄羅斯方塊類 public class ERS_Block extends Frame{ public static boolean isPlay=false; public static int level=1,score=0; public static TextField scoreField,levelField; public static MyTimer timer; GameCanvas gameScr; public static void main(String[] argus){ ERS_Block ers = new ERS_Block("俄羅斯方塊游戲 V1.0 Author:Vincent"); WindowListener win_listener = new WinListener(); ers.addWindowListener(win_listener); } //俄羅斯方塊類的構造方法 ERS_Block(String title){ super(title); setSize(600,480); setLayout(new GridLayout(1,2)); gameScr = new GameCanvas(); gameScr.addKeyListener(gameScr); timer = new MyTimer(gameScr); timer.setDaemon(true); timer.start(); timer.suspend(); add(gameScr); Panel rightScr = new Panel(); rightScr.setLayout(new GridLayout(2,1,0,30)); rightScr.setSize(120,500); add(rightScr); //右邊信息窗體的布局 MyPanel infoScr = new MyPanel(); infoScr.setLayout(new GridLayout(4,1,0,5)); infoScr.setSize(120,300); rightScr.add(infoScr); //定義標簽和初始值 Label scorep = new Label("分數:",Label.LEFT); Label levelp = new Label("級數:",Label.LEFT); scoreField = new TextField(8); levelField = new TextField(8); scoreField.setEditable(false); levelField.setEditable(false); infoScr.add(scorep); infoScr.add(scoreField); infoScr.add(levelp); infoScr.add(levelField); scorep.setSize(new Dimension(20,60)); scoreField.setSize(new Dimension(20,60)); levelp.setSize(new Dimension(20,60)); levelField.setSize(new Dimension(20,60)); scoreField.setText("0"); levelField.setText("1"); //右邊控制按鈕窗體的布局 MyPanel controlScr = new MyPanel(); controlScr.setLayout(new GridLayout(5,1,0,5)); rightScr.add(controlScr); //定義按鈕play Button play_b = new Button("開始游戲"); play_b.setSize(new Dimension(50,200)); play_b.addActionListener(new Command(Command.button_play,gameScr)); //定義按鈕Level UP Button level_up_b = new Button("提高級數"); level_up_b.setSize(new Dimension(50,200)); level_up_b.addActionListener(new Command(Command.button_levelup,gameScr)); //定義按鈕Level Down Button level_down_b =new Button("降低級數"); level_down_b.setSize(new Dimension(50,200)); level_down_b.addActionListener(new Command(Command.button_leveldown,gameScr)); //定義按鈕Level Pause Button pause_b =new Button("游戲暫停"); pause_b.setSize(new Dimension(50,200)); pause_b.addActionListener(new Command(Command.button_pause,gameScr)); //定義按鈕Quit Button quit_b = new Button("退出遊戲"); quit_b.setSize(new Dimension(50,200)); quit_b.addActionListener(new Command(Command.button_quit,gameScr)); controlScr.add(play_b); controlScr.add(level_up_b); controlScr.add(level_down_b); controlScr.add(pause_b); controlScr.add(quit_b); setVisible(true); gameScr.requestFocus(); } } //重寫MyPanel類，使Panel的四周留空間 class MyPanel extends Panel{ public Insets getInsets(){ return new Insets(30,50,30,50); } } //游戲畫布類 class GameCanvas extends Canvas implements KeyListener{ final int unitSize = 30; //小方塊邊長 int rowNum; //正方格的行數 int columnNum; //正方格的列數 int maxAllowRowNum; //允許有多少行未削 int blockInitRow; //新出現塊的起始行坐標 int blockInitCol; //新出現塊的起始列坐標 int [][] scrArr; //屏幕數組 Block b; //對方快的引用 //畫布類的構造方法 GameCanvas(){ rowNum = 15; columnNum = 10; maxAllowRowNum = rowNum - 2; b = new Block(this); blockInitRow = rowNum - 1; blockInitCol = columnNum/2 - 2; scrArr = new int [32][32]; } //初始化屏幕，並將屏幕數組清零的方法 void initScr(){ for(int i=0;i<rowNum;i++) for (int j=0; j<columnNum;j++) scrArr[j]=0; b.reset(); repaint(); } //重新刷新畫布方法 public void paint(Graphics g){ for(int i = 0; i < rowNum; i++) for(int j = 0; j < columnNum; j++) drawUnit(i,j,scrArr[j]); } //畫方塊的方法 public void drawUnit(int row,int col,int type){ scrArr[row][col] = type; Graphics g = getGraphics(); tch(type){ //表示畫方快的方法 case 0: g.setColor(Color.black);break; //以背景為顏色畫 case 1: g.setColor(Color.blue);break; //畫正在下落的方塊 case 2: g.setColor(Color.magenta);break; //畫已經落下的方法 } g.fill3DRect(col*unitSize,getSize().height-(row+1)*unitSize,unitSize,unitSize,true); g.dispose(); } public Block getBlock(){ return b; //返回block實例的引用 } //返回屏幕數組中(row,col)位置的屬性值 public int getScrArrXY(int row,int col){ if (row < 0 || row >= rowNum || col < 0 || col >= columnNum) return(-1); else return(scrArr[row][col]); } //返回新塊的初始行坐標方法 public int getInitRow(){ return(blockInitRow); //返回新塊的初始行坐標 } //返回新塊的初始列坐標方法 public int getInitCol(){ return(blockInitCol); //返回新塊的初始列坐標 } //滿行刪除方法 void deleteFullLine(){ int full_line_num = 0; int k = 0; for (int i=0;i<rowNum;i++){ boolean isfull = true; L1:for(int j=0;j<columnNum;j++) if(scrArr[j] == 0){ k++; isfull = false; break L1; } if(isfull) full_line_num++; if(k!=0 && k-1!=i && !isfull) for(int j = 0; j < columnNum; j++){ if (scrArr[j] == 0) drawUnit(k-1,j,0); else drawUnit(k-1,j,2); scrArr[k-1][j] = scrArr[j]; } } for(int i = k-1 ;i < rowNum; i++){ for(int j = 0; j < columnNum; j++){ drawUnit(i,j,0); scrArr[j]=0; } } ERS_Block.score += full_line_num; ERS_Block.scoreField.setText(""+ERS_Block.score); } //判斷游戲是否結束方法 boolean isGameEnd(){ for (int col = 0 ; col <columnNum; col ++){ if(scrArr[maxAllowRowNum][col] !=0) return true; } return false; } public void keyTyped(KeyEvent e){ } public void keyReleased(KeyEvent e){ } //處理鍵盤輸入的方法 public void keyPressed(KeyEvent e){ if(!ERS_Block.isPlay) return; tch(e.getKeyCode()){ case KeyEvent.VK_DOWN:b.fallDown();break; case KeyEvent.VK_LEFT:b.leftMove();break; case KeyEvent.VK_RIGHT:b.rightMove();break; case KeyEvent.VK_SPACE:b.leftTurn();break; } } } //處理控制類 class Command implements ActionListener{ static final int button_play = 1; //給按鈕分配編號 static final int button_levelup = 2; static final int button_leveldown = 3; static final int button_quit = 4; static final int button_pause = 5; static boolean pause_resume = true; int curButton; //當前按鈕 GameCanvas scr; //控制按鈕類的構造方法 Command(int button,GameCanvas scr){ curButton = button; this.scr=scr; } //按鈕執行方法 public void actionPerformed (ActionEvent e){ tch(curButton){ case button_play:if(!ERS_Block.isPlay){ scr.initScr(); ERS_Block.isPlay = true; ERS_Block.score = 0; ERS_Block.scoreField.setText("0"); ERS_Block.timer.resume(); } scr.requestFocus(); break; case button_levelup:if(ERS_Block.level < 10){ ERS_Block.level++; ERS_Block.levelField.setText(""+ERS_Block.level); ERS_Block.score = 0; ERS_Block.scoreField.setText(""+ERS_Block.score); } scr.requestFocus(); break; case button_leveldown:if(ERS_Block.level > 1){ ERS_Block.level--; ERS_Block.levelField.setText(""+ERS_Block.level); ERS_Block.score = 0; ERS_Block.scoreField.setText(""+ERS_Block.score); } scr.requestFocus(); break; case button_pause:if(pause_resume){ ERS_Block.timer.suspend(); pause_resume = false; }else{ ERS_Block.timer.resume(); pause_resume = true; } scr.requestFocus(); break; case button_quit:System.exit(0); } } } //方塊類 class Block { static int[][] pattern = { {0x0f00,0x4444,0x0f00,0x4444},//用十六進至表示，本行表示長條四種狀態 {0x04e0,0x0464,0x00e4,0x04c4}, {0x4620,0x6c00,0x4620,0x6c00}, {0x2640,0xc600,0x2640,0xc600}, {0x6220,0x1700,0x2230,0x0740}, {0x6440,0x0e20,0x44c0,0x8e00}, {0x0660,0x0660,0x0660,0x0660} }; int blockType; //塊的模式號（0-6） int turnState; //塊的翻轉狀態（0-3） int blockState; //快的下落狀態 int row,col; //塊在畫布上的坐標 GameCanvas scr; //塊類的構造方法 Block(GameCanvas scr){ this.scr = scr; blockType = (int)(Math.random() * 1000)%7; turnState = (int)(Math.random() * 1000)%4; blockState = 1; row = scr.getInitRow(); col = scr.getInitCol(); } //重新初始化塊，並顯示新塊 public void reset(){ blockType = (int)(Math.random() * 1000)%7; turnState = (int)(Math.random() * 1000)%4; blockState = 1; row = scr.getInitRow(); col = scr.getInitCol(); dispBlock(1); } //實現「塊」翻轉的方法 public void leftTurn(){ if(assertValid(blockType,(turnState + 1)%4,row,col)){ dispBlock(0); turnState = (turnState + 1)%4; dispBlock(1); } } //實現「塊」的左移的方法 public void leftMove(){ if(assertValid(blockType,turnState,row,col-1)){ dispBlock(0); col--; dispBlock(1); } } //實現塊的右移 public void rightMove(){ if(assertValid(blockType,turnState,row,col+1)){ dispBlock(0); col++; dispBlock(1); } } //實現塊落下的操作的方法 public boolean fallDown(){ if(blockState == 2) return(false); if(assertValid(blockType,turnState,row-1,col)){ dispBlock(0); row--; dispBlock(1); return(true); }else{ blockState = 2; dispBlock(2); return(false); } } //判斷是否正確的方法 boolean assertValid(int t,int s,int row,int col){ int k = 0x8000; for(int i = 0; i < 4; i++){ for(int j = 0; j < 4; j++){ if((int)(pattern[t][s]&k) != 0){ int temp = scr.getScrArrXY(row-i,col+j); if (temp<0||temp==2) return false; } k = k >> 1; } } return true; } //同步顯示的方法 public synchronized void dispBlock(int s){ int k = 0x8000; for (int i = 0; i < 4; i++){ for(int j = 0; j < 4; j++){ if(((int)pattern[blockType][turnState]&k) != 0){ scr.drawUnit(row-i,col+j,s); } k=k>>1; } } } } //定時線程 class MyTimer extends Thread{ GameCanvas scr; public MyTimer(GameCanvas scr){ this.scr = scr; } public void run(){ while(true){ try{ sleep((10-ERS_Block.level + 1)*100); } catch(InterruptedException e){} if(!scr.getBlock().fallDown()){ scr.deleteFullLine(); if(scr.isGameEnd()){ ERS_Block.isPlay = false; suspend(); }else scr.getBlock().reset(); } } } } class WinListener extends WindowAdapter{ public void windowClosing (WindowEvent l){ System.exit(0); } } 22