what are the legacy classes in Java?

I recently heard Vector is a Legacy class , then I read on a website that Legacy classes are used to save Objects before Collections came. So, why these are not called Deprecated classes, why Legacy ? Legacy classes and interfaces are the classes and interfaces that formed the collections framework in the earlier versions of Java and how now been restructured or re-engineered. They are ful

Java中的遗留类是什么?

我最近听说Vector is a Legacy class ,然后我在一个网站上阅读 传统类用于在集合出现之前保存对象。 那么,为什么这些不叫做Deprecated类,为什么Legacy ? 传统的类和接口是在早期版本的Java中形成集合框架的类和接口,以及现在如何进行重构或重新设计的。 它们与框架完全兼容。 形式上不会被弃用。 所有遗留类都重新设计为支持JDK5中的通用类。 Pratically不被弃用,但有其他类更合适。 遗产=传统的Java版本。

Are Project Coin's collection enhancements going to be in JDK8?

Initially Project Coin had enhanced support for collections eg list[3] instead of list.get(3) and map["hello"] = 27 instead of map.put("hello", 27) but they were not in jdk7. Are they going to be in jdk8? I could not find a definitive answer for either yes or no. Brian Goetz briefly mentions list, set, map (and other possible) literals in this post in the Project Lambda ma

Project Coin的收藏增强功能将在JDK8中发布吗?

最初Project Coin增强了对集合的支持,例如list[3]而不是list.get(3)和map["hello"] = 27而不是map.put("hello", 27)但它们不在jdk7中。 他们会在jdk8吗? 对于是或否,我找不到明确的答案。 Brian Goetz在5月30日的项目Lambda邮件列表中简要地提到了这篇文章中的列表,集合,映射(以及其他可能的)文字: http://mail.openjdk.java.net/pipermail/lambda-dev/2012-May/004979.html 为了说明我的意

What does 'synchronized' mean?

I have some questions regarding the usage and significance of the synchronized keyword. What is the significance of the synchronized keyword? When should methods be synchronized ? What does it mean programmatically and logically? The synchronized keyword is all about different threads reading and writing to the same variables, objects and resources. This is not a trivial topic in Java, b

“同步”是什么意思?

我有一些关于synchronized关键字的用法和重要性的问题。 synchronized关键字的意义是什么? 什么时候应该synchronized方法? 这是什么意思编程和逻辑? synchronized关键字全部是关于读取和写入相同变量,对象和资源的不同线程。 这在Java中并不是一个简单的话题,但是这里是Sun的一句话: synchronized方法可以实现一个简单的策略来防止线程干扰和内存一致性错误:如果一个对象对多个线程可见,则通过同步方法完成对

Comparing Java enum members: == or equals()?

I know that Java enums are compiled to classes with private constructors and a bunch of public static members. When comparing two members of a given enum, I've always used .equals() , eg public useEnums(SomeEnum a) { if(a.equals(SomeEnum.SOME_ENUM_VALUE)) { ... } ... } However, I just came across some code that uses the equals operator == instead of .equals(): publ

比较Java枚举成员:==或equals()?

我知道Java枚举被编译为具有私有构造函数和一些公共静态成员的类。 比较给定枚举的两个成员时,我总是使用.equals() ,例如 public useEnums(SomeEnum a) { if(a.equals(SomeEnum.SOME_ENUM_VALUE)) { ... } ... } 但是,我刚刚遇到了一些使用equals运算符==而不是.equals()的代码: public useEnums2(SomeEnum a) { if(a == SomeEnum.SOME_ENUM_VALUE) { ... } ... }

A 'for' loop to iterate over an enum in Java

I have an enum in Java for the cardinal & intermediate directions: public enum Direction { NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH, SOUTHWEST, WEST, NORTHWEST } How can I write a for loop that iterates through each of these enum values? .values() You can call the values() method on your enum. for (Direction dir : Direction.values()) { // do what you want } T

'for'循环遍历Java中的枚举

我在Java中有一个针对主要和中间方向的enum : public enum Direction { NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH, SOUTHWEST, WEST, NORTHWEST } 我怎样才能写一个迭代遍历每个enum值的for循环? .values() 你可以在你的枚举上调用values()方法。 for (Direction dir : Direction.values()) { // do what you want } 这个values()方法由编译器隐式声明。 所以它没有在Enum文档中列出。 枚

Proper use cases for Android ActivityManager.isUserAMonkey()?

I was looking at the new APIs introduced in Android 2.2. While looking at the ActivityManager class I came across the following method: public static boolean isUserAMonkey() Used to determine whether the user making this call is subject to teleportations. Returns whether the user making this call is a monkey. How and when should this be used? as per android docs Returns "true" if the

适用于Android ActivityManager.isUserAMonkey()的正确用例?

我正在研究Android 2.2中引入的新API。 在查看ActivityManager类时,我遇到了以下方法: public static boolean isUserAMonkey() 用于确定发起此呼叫的用户是否需要远程传送。 返回进行此调用的用户是否是猴子。 如何和何时应该使用? 根据Android文档 Returns "true" if the user interface is currently being messed with by a monkey. 知道应用程序是否使用猴子进行测试 以及如果你做一些自动测试,将会有测

My Android application is working very slowly

I have a 2.67 GHz processor, 4 GB of RAM on a x64 Windows 8 core i7 machine . My understanding is that the Android emulator should start fairly quickly on such a machine, but for me it does not. I have followed all the instructions in setting up the IDE, SDKs, JDKs and such and have had some success in starting the emulator quickly but that is very rare. How can I, if possible, fix this proble

我的Android应用程序工作非常缓慢

我有一个2.67 GHz处理器,一个x64 Windows 8核心i7机器上有4 GB的RAM。 我的理解是,Android模拟器应该在这样的机器上相当快地启动,但对我来说却不行。 我已经遵循了设置IDE,SDK,JDK等的所有说明,并且在启动模拟器方面取得了一些成功,但这种情况非常罕见。 我可以如何解决这个问题? 大多数计算机上的仿真器运行速度非常慢。 我拥有8 GB RAM,4770k @ 4.2GHz,而且还需要很长时间。 当我坐下来开展一个项目时,我开

Why are string identifiers used to access resource data?

I'm working a project to replace a Resource Management system (QuickTime Resource Manager on Mac and Windows) that has been deprecated and I have been using the current model that Qt uses where data is retrieved from the resource file using a string key. For example, I may have an image in my resource file, "HungryBear.png" stored in my resource file. Qt, and my proposed system,

为什么使用字符串标识符来访问资源数据?

我正在开发一个项目来替换已弃用的资源管理系统(Mac和Windows上的QuickTime资源管理器),并且我一直在使用Qt使用的当前模型,其中使用字符串键从资源文件中检索数据。 例如,我的资源文件“HungryBear.png”存储在我的资源文件中。 Qt和我提出的系统可以通过psuedocode描述的方式获得它: image = GetImageResource("BearPlugin/Images/HungryBear.png"); 这一点很清楚,那个形象是什么,以及它在哪里可以找到。 在我们目

Android get text from html

I get a special html code: &lt ;p &gt ;This is &lt ;a href=&quot ;http://www.test.hu&quot ;&gt ;a test link&lt ;/a&gt ; and this is &amp ;nbsp;a sample text with special char: &amp ;#233;va &lt ;/p&gt ; (There isn't space before ; char, but if I don't insert space the stackoverflow format it) It's not a normally html code, but if

Android从html获取文本

我得到一个特殊的html代码: &lt; p&gt;这是&lt; a href =“http://www.test.hu”&gt;测试链接&lt; / a&gt; 这是&amp; nbsp;带有特殊字符的示例文本:&amp;#233; va&lt; / p&gt; (之前没有空格; char,但是如果我不插入空格,它的stackoverflow格式) 这不是一个正常的HTML代码,但如果我粘贴在一个空的HTML页面,浏览器显示它与普通标签: <p>这是<a href="http://www.test.hu">测试

How does HTML parse <font color="testing">?

This question already has an answer here: Why does HTML think “chucknorris” is a color? 8 answers What it's actually doing is splitting it into the RGB values, not the hex color value. So you're not creating #0e0000 , you're creating RGB(0e0, 000, 000) . Since we know that 000 is simply 0 , we only have to look at the 0e0 part of it. From here, you need to remove the leading 0

HTML如何解析<font color =“testing”>?

这个问题在这里已经有了答案: 为什么HTML认为“chucknorris”是一种颜色? 8个答案 它实际做的是将其分成RGB值,而不是十六进制颜色值。 所以你没有创建#0e0000 ,你正在创建RGB(0e0, 000, 000) 。 既然我们知道000只是0 ,我们只需要看看它的0e0部分。 从这里开始,如果超过2位数字,则需要将前导0删除为两位数字,然后截断数字中的两位左数字,从而得到e0 。 当你把它从十六进制转换成十进制时,你最终会得到e0 = 224