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Converting JSON data to Java object
I want to be able to access properties from a JSON string within my Java action method. The string is available by simply saying myJsonString = object.getJson() . Below is an example of what the string can look like:
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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...ed in the presence of mutable data. This is why generics are invariant in Java. Brief example of unsoundness using Java arrays (which are erroneously covariant):
Object[] arr = new Integer[1];
arr[0] = "Hello, there!";
We just assigned a value of type String to an array of type Integer[]. For ...
Android Archive Library (aar) vs standard jar
... as the standard build system for Android apps. Well, coming from standard Java development I usually depend on jar files in order to build my project. However it seems that Android has also aar packages, which are the equivalent to the dll files in a Windows OS, as mentioned here :
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Is the != check thread safe?
... This is the bytecode for test()
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
IF_ACMPEQ L1
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as we can see it loads field a to local vars twice, it's a non-atomic operation, if a was changed in between by another thre...
How do I find out which settings.xml file maven is using
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Apache Maven 3.0.3 (r1075438; 2011-02-28 18:31:09+0100)
Maven home: /usr/java/apache-maven-3.0.3
Java version: 1.6.0_12, vendor: Sun Microsystems Inc.
Java home: /usr/java/jdk1.6.0_12/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.32-32-generic", arch: "i386", ...
throwing an exception in objective-c/cocoa
...o avoid using exceptions for common error situations". The same applies in Java; it's bad practice to handle user input errors (for example) with exceptions. Not just because of resource usage, but also for code clarity.
– beetstra
Dec 7 '10 at 12:58
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Memory address of variables in Java
Please take a look at the picture below.
When we create an object in java with the new keyword, we are getting a memory address from the OS.
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OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...hread_count_个io线程(easy_io_thread_t)，初始化针对每个eio(一般系统就只有一个)的统计信息结构(easy_summary_t)
2. 设置一些tcp参数，比如tcp_defer_accept，tcp_nodelay，设置一些负载保护参数，比如EASY_CONN_DOING_REQ_CNT，表示每个连接同时正在处...
Preferred way of loading resources in Java
I would like to know the best way of loading a resource in Java:
5 Answers
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