offer(E o, long timeout, TimeUnit unit),可以设定等待的时间,如果在指定的时间内,还不能往队列中 加入BlockingQueue,则返回失败。 put(anObject):把anObject加到BlockingQueue里,如果BlockQueue没有空间,则调用此方法的线程被阻断直到BlockingQueue里面有空间再继续. 获取数据: poll(time):取走BlockingQueue里排...
异常处理程序紧跟在 try 块之后,以关键字 catch 表示: try{// Code that might generate exceptions}catch(Type1 id1){// Handle exceptions of Type1}catch(Type2 id2){// Handle exceptions of Type2}catch(Type3 id3){// Handle exceptions of Type3} 复制 每个catch (异常处理程序)看起来就像是接收...
continue or break inside finally block Enabled Warning Empty finally block Enabled Warning Empty try block Enabled Warning Exception constructor called without arguments Disabled Warning finally block which cannot complete normally Enabled Warning instanceof on catch parameter Disabled Warning java.lang.Error...
Node.SHARED for shared * @return the new node */ private Node addWaiter(Node mode) { //创建节点,设置关联线程和模式(独占或共享) Node node = new Node(Thread.currentThread(), mode); // Try the fast path of enq; backup to full enq on failure Node pred ...
// Empty catch block ignores exception - Highly suspect!try{ ... }catch(SomeException e) { } 空的catch块违背了异常的初衷,而异常的目的是强迫处理异常情况。忽略异常类似于忽略火灾警报——关掉它,这样其他人就没有机会看到是否真的发生了火灾。你可能侥幸逃脱,或者结果可能是灾难性的。每当你看到一个空...
if (unresolvedCritExts != null && !unresolvedCritExts.isEmpty()) { // note that a CertPathBuilder may have an enclosing // try block to catch the exception below and continue on error throw new CertPathValidatorException ("Unrecognized Critical Extension"); } 前のセクションで説明したよ...
publicclassWhoCalled{staticvoidf(){// Generate an exception to fill in the stack tracetry{thrownewException();}catch(Exceptione){for(StackTraceElementste:e.getStackTrace())System.out.println(ste.getMethodName());}}staticvoidg(){f();}staticvoidh(){g();}publicstaticvoidmain(String[]args)...
System.out.println("readFile method finally block.");if(null!= reader) {try{ reader.close(); }catch(IOException e) { e.printStackTrace(); } } } } 调用该方法时,读取文件时若发生异常,代码会进入 catch 代码块,之后进入 finally 代码块;若读取文件时未发生异常,则会跳过 catch 代码块直接进入 ...
If there is not enough data to make a complete input block, the data must be padded: that is, before encryption, dummy bytes must be added to make a multiple of the cipher's block size. These bytes are then stripped off during the decryption phase. The padding can either be done by ...
不要将获取锁的过程写在 try 块中,因为如果在获取锁(自定义锁的实现)时发生了异常,异常抛出的同时,也会导致锁无故释放。 Lock 接口提供的 synchronized 关键字所不具备的主要特性如表所示。 Lock 是一个接口,它定义了锁获取和释放的基本操作,Lock 的 API 如表所示。 Lock 接口的实现基本都是通过聚合了一个同...