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When to catch java.lang.Error?

In what situations should one catch java.lang.Error on an application? 16 Answers 16...
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Convert a JSON String to a HashMap

I'm using Java, and I have a String which is JSON: 18 Answers 18 ...
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Why does this Java code compile?

... reasons for the errors are also different. Fields Field initializers in Java are governed by JLS §8.3.2, Initialization of Fields. The scope of a field is defined in JLS §6.3, Scope of a Declaration. Relevant rules are: The scope of a declaration of a member m declared in or inherited by a ...
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How do I check CPU and Memory Usage in Java?

I need to check CPU and memory usage for the server in java, anyone know how it could be done? 15 Answers ...
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Java null check why use == instead of .equals()

In Java I am told that when doing a null check one should use == instead of .equals(). What are the reasons for this? 16 An...
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Calling JMX MBean method from a shell script

...ng JManage server to proxy commands through) Groovy JMX Example: import java.lang.management.* import javax.management.ObjectName import javax.management.remote.JMXConnectorFactory as JmxFactory import javax.management.remote.JMXServiceURL as JmxUrl def serverUrl = 'service:jmx:rmi:///jndi/rmi:/...
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How do I programmatically change file permissions?

In Java, I'm dynamically creating a set of files and I'd like to change the file permissions on these files on a linux/unix file system. I'd like to be able to execute the Java equivalent of chmod . Is that possible Java 5? If so, how? ...
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How can I determine whether a Java class is abstract by reflection

...vy startup. I can't find anything obviously like isAbstract() in the Class.java docs. 3 Answers ...
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Scala: write string to file in one statement

... A concise one line: import java.io.PrintWriter new PrintWriter("filename") { write("file contents"); close } share | improve this answer | ...
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Where is array's length property defined?

... Arrays are special objects in java, they have a simple attribute named length which is final. There is no "class definition" of an array (you can't find it in any .class file), they're a part of the language itself. 10.7. Array Members The membe...