throws

Throw keyword in Java [closed]

由 泪湿孤枕 提交于 2019-12-25 19:07:42
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . In Java, is the keyword (throw) only used for throwing exception that you've created. If not, can someone give an example of how it is used outside of your own made exceptions. 回答1: You can throw anything that extends Throwable void greet(String name) { if (name == null) { throw new

Throw exception in Java

由 放肆的年华 提交于 2019-12-24 00:52:12
问题 Suppose I have a class, the requirement is that "change the following code to throw checked exception if "den" is 0, and change the function to catch that exception". public class divide { void divide(int num, int den){ System.out.println(""+(num/den)); } void fun(){ divide(4,2); } } Which of the following one is the correct way to throw exception? Option 1: void divide(int num, int den) throws Exception{ if(den==0){ throw new Exception("Dividebyzero"); } System.out.println(""+(num/den)); }

Testing if JS method throws RangeError with QUnit

由 风流意气都作罢 提交于 2019-12-23 23:12:06
问题 I made some Javascript unit tests with QUnit library, then I want to test if method throws RangeError. It has be done in this way: QUnit.test("Resolve slide animation from left", function( assert ) { var myOwnCreator = new MyOwnCreator(); assert.equal(myOwnCreator.resolveAnimationType("slideSide", "show", "left"), "slide-left-in"); assert.equal(myOwnCreator.resolveAnimationType("slideSide", "hide", "left"), "slide-left-out"); assert.throws(myOwnCreator.resolveAnimationType("slideSide", "hide"

Java学习路线-27：IO操作深入与IO操作类继承体系

由 孤者浪人 提交于 2019-12-23 11:24:29
第17 章 ： IO操作深入 80 字符编码 常用的编码 1、GBK/GB2312 国标编码， GB2312简体中文，GBK包含简体和繁体 2、ISO8859-1 国际通用编码，描述所有字母 3、UNICODE 16进制存储，描述所有问题 4、UTF 象形文字部分使用16进制，普通字母采用ISO8859-1，主要使用UTF-8 列出本机属性 System . getProperties ( ) . list ( System . out ) ; 项目中出现乱码问题就是编码和解码标准不统一 81 内存操作流 文件操作流 以文件为操作终端，InputStream、OutputStream 内存操作流 1、字节内存操作流 ByteArrayOutputStream ByteArrayInputStream 2、字符内存操作流 CharArrayWriter CharArrayReader 继承关系 OutputStream - FileOutputStream - ByteArrayOutputStream InputStream - FileInputStream - ByteArrayInputStream Writer - OutputStreamWriter - FileWriter - CharArrayWriter Reader - InputStreamReader -

Can I use multiple @throws tags for the same exception in Javadoc?

由 好久不见. 提交于 2019-12-23 09:26:28
问题 Can I use multiple @throws javadoc tags if my application throws the same exception for multiple reasons? For example: @throws UserException if issue 1 happened @throws UserException if issue 2 happened @throws UserException if issue 3 happened Is it prohibited by JavaDoc standard? 回答1: It is valid in java 6,7 and 8. See the docs: Javadoc 6 Javadoc 7 Javadoc 8 Multiple @throws tags can be used in a given doc comment for the same or different exceptions. (emph. mine) 回答2: Just tested this the

修改Servlet模板

由 情到浓时终转凉″ 提交于 2019-12-23 04:19:01
1. plugins/com.genuitec.eclipse.wizards.xxx.jar ---- 都是zip格式的 2. 打开Jar包中的Templates文件夹既可以看到Servlet.java源代码，直接修改就可以了 3. 修改好之后保存 4. 重新启动Myeclipse即可以使用新的模板代码了 Servlet.java #---------------------------------------------# # <aw:description>Template for Servlet</aw:description> # <aw:version>1.1</aw:version> # <aw:date>04/05/2003</aw:date> # <aw:author>Ferret Renaud</aw:author> #---------------------------------------------# <aw:import>java.io.IOException</aw:import> <aw:import>java.io.PrintWriter</aw:import> <aw:import>javax.servlet.ServletException</aw:import> <aw:import>javax.servlet.http

Java 多线程异步处理demo

由 好久不见. 提交于 2019-12-21 16:49:32
java中实现多线程 1）继承Thread,重写里面的run方法 2）实现runnable接口 通过源码发现： 第一种方法说是继承Tread然后重写run方法，通过查看run方法的源码，发现run方法里面调用是runnable接口中抽象的run()方法。 既然这样不如直接使用第二种方法，使用第二种方法，第一 java没有单继承的限制，第二 还可以隔离代码 言归正传下面是第二种方法的demo 1.处理业务代码 1 //根据传参打印对应的名字 2 private void printName(String name) throws Exception{ 3 System.out.println(name); 4 } 2.创建内部类实现Runnable接口 1 private class PrintName implements Runnable{ 2 private String name; 3 4 public PrintName(String name){ 5 this.name = name; 6 } 7 8 //Runnable接口中的抽象方法 9 @Override 10 public void run(){ 11 try { 12 printName(name); 13 }catch (Exception e){ 14 System.out.println(e); 15 }

Should I put throws IllegalArgumentException at the function?

由 瘦欲@ 提交于 2019-12-21 07:08:20
问题 I'm building a scientific software with lots of calculations and of course arguments can have wrong lengths etc... So I used IllegalArgumentException class as it seemed right name for the issue, but should I put the throws IllegalArgumentException at the function definition ? I am asking this because after I wrote it, the Eclipse Editor didn't ask me to surround the function with try and catch. I thought this is how try and catch were enforced. I've read the Exception handling tutorial at

Inheritance , method signature , method overriding and throws clause

由 試著忘記壹切 提交于 2019-12-20 09:56:05
问题 My Parent class is : import java.io.IOException; public class Parent { int x = 0; public int getX() throws IOException{ if(x<=0){ throw new IOException(); } return x; } } I extend this class to write a subclass Child : public class Child1 extends Parent{ public int getX(){ return x+10; } } Notice while overriding the getX method in the Child class , I have removed the throws clause from the method definition .Now it results in an anomalous behavior by the compiler which is expected : new

Should I declare unchecked exceptions in the throws specification?

由 怎甘沉沦 提交于 2019-12-20 09:16:15
问题 I'm aware checked exceptions have to be handled or specified, but unchecked exceptions are optional. If for some reason I can reasonably expect an unchecked exception to occur in a method, should I add it to the throws specification? Or should I keep the specification as short as possible? 回答1: If for some reason I can reasonably expect an unchecked exception to occur in a method, should I add it to the throws specification? Since unchecked exceptions indicate programming errors , declaring
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