finally

redis通用工具类

旧街凉风 提交于 2019-11-30 09:12:09
public class RedisUtil { private static final Logger LOGGER = Logger.getLogger(RedisUtil.class); private static JedisPool pool = null; private static RedisUtil ru = new RedisUtil(); private RedisUtil() { if (pool == null) { String ip = InitListener.getValue("redis.ip", "192.168.116.207"); int port = Integer.parseInt(InitListener.getValue("redis.port", "5379")); JedisPoolConfig config = new JedisPoolConfig(); // 控制一个pool可分配多少个jedis实例,通过pool.getResource()来获取; // 如果赋值为-1,则表示不限制;如果pool已经分配了maxActive个jedis实例,则此时pool的状态为exhausted(耗尽)。 config.setMaxTotal(10000); // 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例。

Java中的多态应用

非 Y 不嫁゛ 提交于 2019-11-30 04:24:12
1 class Test { 2 public static void main(String[] args) { 3 System.out.println(new B().getValue());      //1、执行B的构造方法       //14、执行父类A的getValue得到17       //18、输出返回值17 4 } 5 static class A { 6 protected int value; 7 public A (int v) { 8 setValue(v);         //3、调用子类B重写的setValue 9 } 10 public void setValue(int value) { 11 this.value= value;         //5、value=10          //13、valve=16 12 } 13 public int getValue() { 14 try { 15 value ++;           //6、value=11            //15、value=17 16 return value;           //10、执行finally前暂存value的值11,返回11           //18、执行finally前暂存的值17,返回17 17 } finally { 18

What is the purpose of “finally” in try/catch/finally

删除回忆录丶 提交于 2019-11-30 03:15:28
The syntax will change from language to language, but this is a general question. What is the difference between this.... try { Console.WriteLine("Executing the try statement."); throw new NullReferenceException(); } catch (NullReferenceException e) { Console.WriteLine("{0} Caught exception #1.", e); } finally { Console.WriteLine("Executing finally block."); } and this.... try { Console.WriteLine("Executing the try statement."); throw new NullReferenceException(); } catch (NullReferenceException e) { Console.WriteLine("{0} Caught exception #1.", e); } Console.WriteLine("Executing finally block

Finally in C++

假如想象 提交于 2019-11-30 02:23:34
Is this a good way to implement a Finally-like behavior in standard C++? (Without special pointers) class Exception : public Exception { public: virtual bool isException() { return true; } }; class NoException : public Exception { public: bool isException() { return false; } }; Object *myObject = 0; try { // OBJECT CREATION AND PROCESSING try { myObject = new Object(); // Do something with myObject. } // EXCEPTION HANDLING catch (Exception &e) { // When there is an excepion, handle or throw, // else NoException will be thrown. } throw NoException(); } // CLEAN UP catch (Exception &e) { delete

try-catch语句以及finally

自古美人都是妖i 提交于 2019-11-30 00:58:41
Java使用try-catch语句来处理异常,将可能出现异常操作放在try-catch语句的try部分,一旦try部分抛出异常对象,或者调用某个可能抛出异常对象的方法,并且该方法抛出异常对象,那么try部分将立刻结束执行,转向执行相应的catch部分。所以程序可以将发生异常后的处理放在catch部分。try-catch语句可以由几个catch组成,分别处理发生的相应异常。finally语句,无论是否抛出异常都会执行。 package com.example; /** * Main * * @author : lao * @date : 2019/9/18 14:30 */ public class Main { public static void main(String args[]) { int i; try { // i = Integer.parseInt("ada12"); i = Integer.parseInt("123"); System.out.println("输出" + i); } catch (Exception e) { System.out.println("抛出异常catch执行" + e.getMessage()); e.printStackTrace(); } finally { System.out.println(

Should Marshal.FreeHGlobal be placed in a finally block to ensure resources are disposed?

自闭症网瘾萝莉.ら 提交于 2019-11-29 21:13:49
问题 I have the following block of code: IntPtr unmanagedPointer = Marshal.AllocHGlobal(buffer.Length); Marshal.Copy(buffer, 0, unmanagedPointer, buffer.Length); SomeCommandThatCanThrowAnException(); Marshal.FreeHGlobal(unmanagedPointer); Should the block be wrapped in a try, and the FreeHGlobal command be placed in a finally block. (In case the middle command throws an exception). It seems to make sense that finally would prevent memory leaks in this case, however from examples that I have found

final,finally.finalize的区别

孤街醉人 提交于 2019-11-29 20:49:10
final :     修饰属性 -> 表示属性不可变(表示为常量)   修饰方法 -> 表示方法不可被覆盖(表示为最终方法)   修饰类 -> 表示类不可被继承(表示为最终类) finally :  是异常处理语句结构的一部分,表示不管有异常发生,总是会执行,除非虚拟机停止 finalize :  是Object类的一个方法,在垃圾回收器执行回收操作时,会调用被回收对象的finalize方法,释放资源。 来源: https://www.cnblogs.com/zbzb1/p/11531595.html

Javascript error handling with try .. catch .. finally

旧时模样 提交于 2019-11-29 19:57:08
I have a suspicion that I'm using the finally block incorrectly, and that I don't understand the fundamentals of its purpose... function myFunc() { try { if (true) { throw "An error"; } } catch (e) { alert (e); return false; } finally { return true; } } This function will run the catch block, alert "An error", but then return true. Why doesn't it return false? Gilean The finally block contains statements to execute after the try and catch blocks execute but before the statements following the try...catch statement. The finally block executes whether or not an exception is thrown. If an

try、catch

早过忘川 提交于 2019-11-29 18:57:26
结论:1、不管有没有异常finally中的代码块总会执行 2、当try和catch中有return时,finally也会执行 3、因为会遇到很多种情况,当他们都有return时,只有finally的return才是结束方法的,其他两个一律忽略 4、 finally最好不包含return,否则程序会提前退出,返回值不是try、catch之前保存的值 例子: 情况1 :try{} catch(){}finally{} return; 显然程序按顺序执行。 情况2 :try{ return; }catch(){} finally{} return; 程序执行try块中return之前(包括return语句中的表达式运算)代码; 再执行finally块,最后执行try中return; finally块之后的语句return,因为程序在try中已经return所以不再执行。 情况3 :try{ } catch(){return;} finally{} return; 程序先执行try,如果遇到异常执行catch块, 有异常:则执行catch中return之前(包括return语句中的表达式运算)代码,再执行finally语句中全部代码, 最后执行catch块中return. finally之后也就是4处的代码不再执行。 无异常:执行完try再finally再return. 情况4 :try{

finally语句块的有限范围(skycto JEEditor)

大城市里の小女人 提交于 2019-11-29 17:31:13
finally语句块一定执行吗? 答案是不一定。 直接返回未执行到finally语句块 抛出异常未执行到finally语句块 系统退出未执行到finally语句块 ... 存在很多特殊情况导致finally语句块不执行。 代码如下 public static String test() { String str = null; int i = 0; if (i == 0) { return str;//直接返回未执行到finally语句块 } try { System.out.println("try..."); return str; } finally { System.out.println("finally..."); } } public static String test2() { String str = null; int i = 0; i = i / 0;//抛出异常未执行到finally语句块 try { System.out.println("try..."); return str; } finally { System.out.println("finally..."); } } public static String test3() { String str = null; try { System.out.println("try...");