Java编程规则.pptVIP

Java编程规则 好的习惯事半功倍 EmptyCatchBlock and EmptyTryBlock EmptyFinallyBlock 补充上必要的代码 或者删除 EmptyIfStmt EmpytWhileStmt EmptySwitchStatements JumbledIncrementer 避免这种混乱的写法，通常意味着错误 就算是达到想要的目的，也会让人觉得迷惑 ForLoopShouldBeWhileLoop 既没有初始化也没有自增加操作，更适合用while(true) UnnecessaryConversionTemporary ReturnFromFinallyBlock EmptySynchronizedBlock UnnecessaryReturn EmptyStaticInitializer UnconditionalIfStatement EmptyStatementNotInLoop BooleanInstantiation UnnecessaryFinalModifier CollapsibleIfStatements UselessOverridingMethod ClassCastExceptionWithToArray AvoidDecimalLiteralsInBigDecimalConstructor UselessOperationOnImmutable String, BigDecimal or BigInteger MisplacedNullCheck UnusedNullCheckInEquals BrokenNullCheck AvoidUsingOctalValues AvoidUsingHardCodedIP CheckResultSet 对于ResultSet的next、previous、first、last操作，都要判断下返回值 AvoidMultipleUnaryOperators 用多个一元操作符通常都是个bug，或者让人摸不到头脑 首先确定不是bug，然后想办法简化 EmptyInitializer Braces IfStmtsMustUseBraces WhileLoopsMustUseBraces IfElseStmtsMustUseBraces ForLoopsMustUseBraces SimplifyBooleanReturns SimplifyBooleanExpressions SwitchStmtsShouldHaveDefault AvoidDeeplyNestedIfStmts AvoidReassigningParameters SwitchDensity 如果statements的每个case语句过多，可以考虑把这些代码挪到新建的方法中 ConstructorCallsOverridableMethod FinalFieldCouldBeStatic CloseResource Connection Statement ResultSet NonStaticInitializer DefaultLabelNotLastInSwitchStmt NonCaseLabelInSwitchStatement EqualsNull ConfusingTernary 建议先判断== InstantiationToGetClass IdempotentOperations ImmutableField AvoidProtectedFieldInFinalClass AssignmentToNonFinalStatic MissingStaticMethodInNonInstantiatableClass AvoidSynchronizedAtMethodLevel 方法级的同步容易在日后的修改中让不需要同步的代码混进来。 确保只有需要同步的代码才同步 MissingBreakInSwitch AvoidInstanceofChecksInCatchClause SimplifyConditional instanceof不需要检查参数是否为null CompareObjectsWithEquals PositionLiteralsFirstInComparisons UnnecessaryLocalBeforeReturn Uncommented UncommentedEmptyMethod UncommentedEmptyConstructor UnsynchronizedStaticDateFormatter SimpleDataFormat不是同步的 PreserveStackTrace SingularField 一个变量仅仅在一个方法中