有什么不同？ From Understanding Weak References, by Ethan Nicholas: Weak references A weak reference, simply put, is a reference that isn't strong enough to force an object to remain in memory. Weak references allow you to leverage the garbage collector's ability to determine reachability for you, so you don't have to do it yourself. You create a weak reference like this: WeakR
有什么不同？ 从理解弱引用，Ethan Nicholas： 弱引用 简而言之，一个弱的参考是一个不够强大的对象，不足以强迫对象留在记忆中。 弱引用使您可以利用垃圾收集器为您确定可达性的能力，因此您无需自己动手。 你创建一个像这样的弱引用： WeakReference weakWidget = new WeakReference(widget); 然后在代码中的其他地方，您可以使用weakWidget.get()来获取实际的Widget对象。 当然，弱引用不足以防止垃圾收集，因此您可
I'm reviewing some new code. The program has a try and a finally block only. Since the catch block is excluded, how does the try block work if it encounters an exception or anything throwable? Does it just go directly to the finally block? If any of the code in the try block can throw a checked exception, it has to appear in the throws clause of the method signature. If an unchecked exc
我正在审阅一些新的代码。 该程序只有一个try和一个finally块。 由于catch块被排除在外，如果try块在遇到异常或任何可抛出的情况时如何工作？ 它是否直接进入finally块？ 如果try块中的任何代码可以抛出一个检查的异常，它必须出现在方法签名的throws子句中。 如果引发一个未经检查的异常，它将冒出方法。 无论是否抛出异常，finally块都会执行。 关于try / finally一个小记录：finally将永远执行，除非 System.exit
This question already has an answer here: Does finally always execute in Java? 50 answers Basically, what Java does is the following: StringBuilder valueToReturn = builder.append("Passed!!!"); executeFinallyBlock(); return valueToReturn; Whatever you're doing inside the finally block, Java has kept a reference to the value to return, and returns that reference. So it becomes: StringB
这个问题在这里已经有了答案： 最终总是在Java中执行？ 50个答案 基本上，Java所做的是以下内容： StringBuilder valueToReturn = builder.append("Passed!!!"); executeFinallyBlock(); return valueToReturn; 无论你在finally块中做什么，Java都会保留对返回值的引用，并返回该引用。 所以它变成： StringBuilder valueToReturn = builder.append("Passed!!!"); builder = null; return valueToReturn; 答案很简单。
Possible Duplicate: In Java, does return trump finally? I came across a java code snippet in a dao implementation .It returns a List as shown below. After the 'return' statement is executed,the finally block tries to close the session.Will this work? or will the session remain open? thanks mark import org.hibernate.SessionFactory; import org.hibernate.Criteria; ... public List
可能重复： 在Java中，最终还是回归王牌？ 我在dao实现中遇到了一个java代码片段。它返回一个List，如下所示。 执行'return'语句后，finally块会尝试关闭会话。这项工作会完成吗？ 或者会议是否仍然开放？ 谢谢 标记 import org.hibernate.SessionFactory; import org.hibernate.Criteria; ... public List<Item> findItems(String name) { SessionFactory factory = HibernateUtil.getSessionFact
This question already has an answer here: Does finally always execute in Java? 50 answers finally is executed before return statement. As java rule finally will always be executed except in case when JVM crashes or System.exit() is called. Java Language Specification clearly mentions the execution of finally in different conditions: http://docs.oracle.com/javase/specs/jls/se7/html/jls-1
这个问题在这里已经有了答案： 最终总是在Java中执行？ 50个答案 finally在return语句之前执行。 由于Java规则finally总是会除了在案件执行时JVM崩溃或System.exit()调用。 Java语言规范清楚地提到最终在不同情况下的执行： http://docs.oracle.com/javase/specs/jls/se7/html/jls-14.html#jls-14.20.2 return语句对finally块的执行没有影响。 finally块不执行的唯一方法是如果JVM在执行finally块之前崩溃/退出。
Possible Duplicate: In Java, does return trump finally? What does this function return? public int wasExceptionThrown() { try { if(1==1) throw new RuntimeException(); return 1; } catch(Exception e) { return 2; } finally { return 3; } return 0; } If you call System.exit(0); then finally blocks are not called as the thread is shutdown immediately.
可能重复： 在Java中，最终还是回归王牌？ 这个函数返回什么？ public int wasExceptionThrown() { try { if(1==1) throw new RuntimeException(); return 1; } catch(Exception e) { return 2; } finally { return 3; } return 0; } 如果你调用System.exit(0); 然后finally块不被调用，因为线程立即关闭。 在所有其他情况下，块finally被调用（假设它会） 最后before返回
This question already has an answer here: Does finally always execute in Java? 50 answers What comes first - finally or catch block? 8 answers http://docs.oracle.com/javase/tutorial/essential/exceptions/finally.html http://docs.oracle.com/javase/specs/jls/se7/html/jls-14.html#jls-14.20.2 finally always executes. If there is a return in try , the rest of try and catch don't execut
这个问题在这里已经有了答案： 最终总是在Java中执行？ 50个答案 什么是第一个 - 最终还是赶上封锁？ 8个答案 http://docs.oracle.com/javase/tutorial/essential/exceptions/finally.html http://docs.oracle.com/javase/specs/jls/se7/html/jls-14.html#jls-14.20.2 finally总是执行。 如果try return ， try和catch的其余部分不会执行，然后finally执行（从最内层到最外层），然后该函数退出。 首先你需要去阅
This question already has an answer here: Does finally always execute in Java? 50 answers Java's return value in try-catch-finally mechanism 4 answers Because finally block will be executed every time whether you enter in try or in catch , I think that's why its called finally :) FROM JAVA DOCS The finally block always executes when the try block exits. This ensures that the f
这个问题在这里已经有了答案： 最终总是在Java中执行？ 50个答案 Java在try-catch-finally机制中的返回值4的答案 因为每次无论你输入try还是catch ， finally块都会被执行，我想这就是为什么它最终被调用:) 来自JAVA DOCS 当try块退出时，finally块总是执行。 这可确保即使发生意外异常也能执行finally块。 注意：它不会仅在以下情况下执行 如果JVM在try或catch代码执行时退出，那么finally块可能不会执行。 同
This question already has an answer here: Java try-finally return design question 7 answers Does finally always execute in Java? 50 answers Everything works exactly as expected, no bugs here. When you have doubts, the JLS is your savior: JLS - 14.20.2. Execution of try-finally and try-catch-finally : If execution of the try block completes abruptly for any other reason R, then the fi
这个问题在这里已经有了答案： Java尝试 - 最终返回设计问题7的答案 最终总是在Java中执行？ 50个答案 一切都按预期工作，这里没有错误。 当你有疑问时，JLS是你的救星： JLS - 14.20.2。 try-finally和try-catch-finally的执行 ： 如果try块的执行由于任何其他原因R而突然完成，则执行finally块，然后有一个选择： 如果finally块正常完成，那么try语句 由于原因R突然完成 如果由于S原因，finally块突然完
This question already has an answer here: Does finally always execute in Java? 50 answers The finally block always executes when the try block exits （单击） The finally block always executes when the try block exits 。 The finally block, if used, is placed after a try block and the catch blocks that follow it. The finally block contains code that will be run whether or not an exception is
这个问题在这里已经有了答案： 最终总是在Java中执行？ 50个答案 The finally block always executes when the try block exits （单击） The finally block always executes when the try block exits 。 如果使用finally块，则放在try块和它后面的catch块之后。 finally块包含将运行的代码，无论是否在try块中引发异常。 一般的语法如下所示： public void someMethod{ Try { // some code } Catch(Excep