• Java += 操作符实质

  • 将InputStream转换为String

  • 将数组转换为List

  • 如何遍历map对象

  • public，protected，private，不加修饰符。有什么区别呢？

  • 如何测试一个数组是否包含指定的值？

  • 重写（Override）equlas和hashCode方法时应考虑的问题

  • 从一个多层嵌套循环中直接跳出

  • 如何将String转换为Int

  • 如何分割（split）string字符串

  • 在java中如何对比（compare）string

  • Map基于Value值排序

  • `HashMap和Hashtable的区别

  • 如何便捷地将两个数组合到一起

  • Java 是否支持默认的参数值

  • Java 产生指定范围的随机数

  • JavaBean 到底是什么

  • wait()和sleep()的区别

  • 能否在一个构造器( constructor )中调用另一个构造器

  • finally 代码块总会被执行么

  • 如何将String转换为enum

  • 在Java中声明数组

  • 反射是什么及其用途

  • 为什么不能用string类型进行switch判断

  • 比较java枚举成员使用equal还是==

  • 用java怎么创建一个文件并向该文件写文本内容

  • serialVersionUID 有什么作用？该如何使用？

编程技巧

  • 去掉烦人的“!=null”(判空语句

  • 获取完整的堆栈信息

  • 如何用一行代码初始化一个ArrayList

  • 初始化静态map

  • 给3个布尔变量，当其中有2个或者2个以上为true才返回true

  • 输出 Java 数组最简单的方式

  • 为什么以下用随机生成的文字会得出 “hello world”?

  • 什么在java中存放密码更倾向于char[]而不是String

  • 如何避免在JSP文件中使用Java代码

  • Java 源码里的设计模式

  • 如何产生一个随机的字母数字串作为 session 的唯一标识符

  • 如何创建单例

  • 实现Runnable接口 VS. 继承Thread类

  • 我应该用哪一个@NotNull注解

  • 怎样将堆栈追踪信息转换为字符串

  • 如何处理 java.lang.outOfMemoryError PermGen space error

网络

  • 如何使用java.net.URLConnection接收及发送HTTP请求

性能

  • LinkedList、ArrayList各自的使用场景，如何确认应该用哪一个呢？

  • StringBuilder和StringBuffer有哪些区别呢

  • 为什么处理排序的数组要比非排序的快

测试

  • 如何测试 private 方法，变量或者内部类

Android

  • 在Android里面下载文件，并在ProgressDialog显示进度

  • 如何获取Android设备唯一ID

待翻译问题链接(还剩x问题)

  • Why is subtracting these two times (in 1927) giving a strange result?

  • Proper use cases for Android UserManager.isUserAGoat()?

  • Creating a memory leak with Java [closed] 用户AutumnLight正在翻译该问题

  • Why is printing “B” dramatically slower than printing “#”?

  • How can I create an executable jar with dependencies using Maven?

  • Why is executing Java code in comments with certain Unicode characters allowed?

  • Convert a String to an enum in Java

  • Android SDK installation doesn’t find JDK

  • Java inner class and static nested class

  • ‘Must Override a Superclass Method’ Errors after importing a project into Eclipse

  • Fastest way to determine if an integer’s square root is an integer

  • How to fix: Unsupported major.minor version 51.0 error?

  • How to generate a random alpha-numeric string?

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

  • Failed to load the JNI shared Library (JDK)

  • How to create a Java String from the contents of a file?

  • How do you assert that a certain exception is thrown in JUnit 4 tests?

  • What exactly is Apache Camel?

  • How can I permanently have line numbers in IntelliJ?

  • How do servlets work? Instantiation, shared variables and multithreading

  • Access restriction on class due to restriction on required library rt.jar?

  • How do I discover memory usage of my application in Android?

  • How can I generate an MD5 hash?

  • Uncatchable ChuckNorrisException

  • Can I add jars to maven 2 build classpath without installing them?

  • Update Eclipse with Android development tools v. 23

  • Setting multiple jars in java classpath

  • Iterating through a list, avoiding ConcurrentModificationException when removing in loop

  • Is null check needed before calling instanceof

  • How does the Java for each loop work?

  • What is the Java equivalent for LINQ?

  • Hibernate hbm2ddl.auto possible values and what they do?

  • How to round a number to n decimal places in Java

  • How can I pad an integers with zeros on the left?

  • Sort ArrayList of custom Objects by property

  • What’s the difference between @Component, @Repository & @Service annotations in Spring?

  • Why is Java Vector class considered obsolete or deprecated?

  • Efficiency of Java “Double Brace Initialization”?

  • Why does this go into an infinite loop?

  • When and how should I use a ThreadLocal variable?

  • decompiling DEX into Java sourcecode

  • How to create a generic array in Java?

  • Why does Math.round(0.49999999999999994) return 1

  • Eclipse: Set maximum line length for auto formatting?

  • What is the difference between a soft reference and a weak reference in Java?

  • What is the equivalent of the C++ Pair in Java?

  • What is the difference between JSF, Servlet and JSP?

  • How do I “decompile” Java class files?

  • Useful Eclipse Java Code Templates [closed]

  • How to call SOAP web service in Android


原文：http://www.cricode.com/4182.html