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Difference between java.util.Random and java.security.SecureRandom
My team got handed over some server side code (in Java) that generates random tokens and I have a question regarding the same -
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Extracting .jar file with command line
...From the docs:
To extract the files from a jar file, use x, as in:
C:\Java> jar xf myFile.jar
To extract only certain files from a jar file, supply their filenames:
C:\Java> jar xf myFile.jar foo bar
The folder where jar is probably isn't C:\Java for you, on my Windows partition...
How to deal with “java.lang.OutOfMemoryError: Java heap space” error?
...am writing a client-side Swing application (graphical font designer) on Java 5 . Recently, I am running into java.lang.OutOfMemoryError: Java heap space error because I am not being conservative on memory usage. The user can open unlimited number of files, and the program keeps the opened objec...
What is the garbage collector in Java?
I am new to Java and confused about the garbage collector in Java. What does it actually do and when does it comes into action. Please describe some of the properties of the garbage collector in Java.
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How can I get the count of milliseconds since midnight for the current?
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Java doesn't support time travel.
– R. Martinho Fernandes
Aug 2 '12 at 20:46
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Change Name of Import in Java, or import two classes with the same name
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There is no import aliasing mechanism in Java. You cannot import two classes with the same name and use both of them unqualified.
Import one class and use the fully qualified name for the other one, i.e.
import com.text.Formatter;
private Formatter textFormatter;...
Why does Java allow us to compile a class with a name different than the file name?
I have a file Test.java and the following code inside it.
8 Answers
8
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Running Command Line in Java [duplicate]
Is there a way to run this command line within a Java application?
8 Answers
8
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What exactly does a jar file contain?
...ly just a ZIP file. It can contain anything - usually it contains compiled Java code (*.class), but sometimes also Java sourcecode (*.java).
However, Java can be decompiled - in case the developer obfuscated his code you won't get any useful class/function/variable names though.
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Why does Java have transient fields?
Why does Java have transient fields?
15 Answers
15
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