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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...
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 ...
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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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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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:/...
Scala: write string to file in one statement
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A concise one line:
import java.io.PrintWriter
new PrintWriter("filename") { write("file contents"); close }
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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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Where is array's length property defined?
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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...
Eclipse comment/uncomment shortcut?
...t so far I haven't found solutions for comment/uncomment shortcut on both Java class editor and jsf faceted webapp XHTML file editor :
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Trusting all certificates with okHttp
...stManager() {
@Override
public void checkClientTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
}
@Override
public void checkServerTrusted(java.security.cert.X509Certificate[] chain, String authType)...