【新整理】JAVA編碼規(guī)范(開發(fā)培訓(xùn)講義)課件

1、Lishoulin,PTC普聯(lián)軟件(中國)有限公司2011年度入職培訓(xùn)，濟南燕山學(xué)院PANSOFTJULY,2011編碼規(guī)范(JAVA版)JAVA之路JAVA開發(fā)人員編碼規(guī)范Technology Team Progresscom.pansoft.financecom.pansoft.public class JRaster;class JImageSprite interface IRasterDelegate;interface IStoring; run();runFast();getBackground(); char c;int i;float myWidth; int mEmploy

2、eeId;String mName;Customer mCustomer; public void callMe(int pAge, String pName)static final int MIN_WIDTH = 4;static final int MAX_WIDTH = 999;static final int GET_THE_CPU = 1; /* * Classname * * Version information * * Date * * Copyright notice */ package java.awt; import java.awt.peer.CanvasPeer;

3、 /正常斷行 someMethod(int anArg, Object anotherArg, String yetAnotherArg, Object andStillAnother) . /若斷行后很靠右，則下面行可以縮進(jìn)8個空格，看上去更美 觀。 private static synchronized horkingLongMethodName(int anArg, Object anotherArg, String yetAnotherArg, Object andStillAnother) . /縮小過少，不易閱讀1 if (condition1 & condition2)2

4、 | (condition3 & condition4)3 |!(condition5 & condition6) 4 doSomethingAboutIt(); /這一行不易閱讀識別 /較多的縮進(jìn)，便于閱讀5 if (condition1 & condition2)6 | (condition3 & condition4)7 |!(condition5 & condition6) 8 doSomethingAboutIt(); 1 alpha = (aLongBooleanExpression) ? beta : gamma;2 alpha = (aL

5、ongBooleanExpression) ? beta : gamma;3 alpha = (aLongBooleanExpression) ? beta : gamma; /* * Here is a block comment. */1 if (condition) 2 /* Handle the condition. */3 /code.4 1 if (a = 2) 2 return TRUE; /* special case */3 else 4 return isPrime(a); /* works only for odd a */5 1 if (foo 1) 2. / Do a

6、 double-flip.3 4 else 5. return false; / Explain why here.6 7. /if (bar 1) 8 / / Do a triple-flip.9 /10 /else 11 / return false;12 / /* * The Example class provides . */ public class Example .1 int level; / indentation level2 int size; / size of table /這樣不好 3 int level, size; 4 int foo, fooarray; /錯

7、誤寫法錯誤寫法1 void myMethod() 2 int int1 = 0; / 好的聲明3 if (condition) 4 int int2 = 0; / 不好的聲時5 .6 7 1 class Sample extends Object 2 int ivar1;3 int ivar2;4 Sample(int i, int j) 5 ivar1 = i;6 ivar2 = j;7 8 int emptyMethod() 9 .10 1 argv+; / Correct 2 argc-; / Correct 3 argv+; argc-; / AVOID! 1 if ( this.is

8、Exist(“0001”) 2 argc-; / Correct 3 System.out.println(“HELLO”); 4 1. return; 2. return myDisk.size(); 3. return (size ? size : defaultSize); 1. if (condition) 2 statements; 3 4 if (condition) 5 statements; 6 else 7 statements; 8 9 If (condition) 10 statements;11 else if (condition) 12 statements; 13

9、 else 14 statements; 15 if (condition) /非法的，應(yīng)該以包括 statement; for (initialization; condition; update) statements; while (condition) statements; while (condition) ; do statements; while (condition);1 switch (condition) 2 case ABC:3 statements;4 /* falls through */5 case DEF:6 statements;7 break;8 case

10、 XYZ:9 statements;10 break;11 default:12 statements;13 break;14 try statements; catch (ExceptionClass e) statements; finally statements; 1 a += c + d;2 a = (a + b) / (c * d);3 while (d+ = s+) 4 n+;5 6 printSize(size is + foo + n); 7 for (expr1; expr2; expr3)8 myMethod(byte) aNum, (Object) x);9 myMet

11、hod(int) (cp + 5), (int) (i + 3) + 1); 1 ooBar.fChar = barFoo.lchar = c; / 禁止此種方法 2 if (c+ = d+) / AVOID! (Java disallows) . 3 /應(yīng)該寫成 4 if (c+ = d+) != 0) . 5 1 d = (a = b + c) + r; / AVOID /應(yīng)該寫成 2 a = b + c; 3 d = a + r;1 if (booleanExpression) 2 return true;3 else 4 return false;5 應(yīng)該代之以如下方法：6 retur

12、n booleanExpression;1 if (condition) 2 return x;3 4 return y; 應(yīng)該寫做：5 return (condition ? x : y);1 JResponseObject RO = new JResponseObject();/獲得一個可用連接，這個連接可能獲取不到。2 JConnection conn = 3 (JConnection) JActiveDComDM.AbstractDataActiveFramework.InvokeObjectMethod(4 DBManagerObject, GetDBConnection, Para

13、m);/因此，這里要判斷一下。5 if ( conn = null ) /如果是無效連接，要返回錯誤信息。6 RO.ErrorCode = -1;7 RO.ErrorString = 無法獲得數(shù)據(jù)庫連接;8 return RO;9 1 try 2 DBOFormService.3 SQLQuery(conn,msgInput.asStringValue(SqlText,),IE.getResultMessage(); /根據(jù)需要，返回對象類型的結(jié)果。4 RO.ResponseObject = IE;5 catch (Exception E) /發(fā)生異常時，要把異常信息返回。6 RO.Error

14、Code = -1;7 RO.ErrorString = E.getMessage();8 9 finally /finally里執(zhí)行連接的關(guān)閉操作。10 conn.close();11 12 return RO;1 Statement pSession = null;2 ResultSet pRS = null;3 pSession = conn. createStatement();4 String pSql = “SELECT * FROM LSCONF WHERE 1 = 1 ”;5 try6 pRS = pSession. executeQuery (pSql);7 if ( pRS

15、.next()8 /這里是邏輯代碼。用來取數(shù)。9 10 11 catch(Exception E)12 /這里是一個異常，需要把異常信息想法通知調(diào)用者?？梢允褂胻hrow 拋出。13 1 finally 2 try 3 /清理操作。 4 if ( pRS != null ) 5 pRS.close(); 6 7 if ( pSession != null ) 8 pSession.close(); 9 10 11 catch(Exception EE) 12 /這里可能也有異常，不需要拋出。 13 14 1 IAction mActStop = TAction.Create(STOP, 停止,

16、S,this,onStop,SYS_STOP); 2 JButton btStop = new JButton(“”); 3 btStop.setAction(mActStop); 4 public boolean onStop(IAction pAct,ActionEvent pEvt) 5 return true; /這里即是處理代碼。 6 7 JMenuItem pMM = new JMenuItem(); 8 pMM.setAction(mActStop)；1 public static String F(String pStringFormat,String P1)2 public static String F(String pStringFormat,String P1,String P2)3 public static String F(String pStringFormat,String P1,String P2,String P3)4 public static String F(String pStringFormat,String