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Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
Java doesn't allow multiple inheritance, but it allows implementing multiple interfaces. Why?
18 Answers
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Why is the String class declared final in Java?
From when I learned that the class java.lang.String is declared as final in Java, I was wondering why that is. I didn't find any answer back then, but this post: How to create a replica of String class in Java? reminded me of my query.
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Java RegEx meta character (.) and ordinary dot?
In Java RegEx, how to find out the difference between . (dot) the meta character and the normal dot as we using in any sentence. How to handle this kind of situation for other meta characters too like ( * , + , \d ,...)
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What does “The APR based Apache Tomcat Native library was not found” mean?
...allows optimal performance in production environments was not found on the java.library.path"
The library referred to is bundled into an OS specific dll (tcnative-1.dll) loaded via JNI. It allows tomcat to use OS functionalities not provided in the Java Runtime (such as sendfile, epoll, OpenSSL, sy...
Java Look and Feel (L&F) [closed]
I am developing a desktop application with Java Swing for my personal use.I am in need of some beautiful Look and Feel for my application. How can I do it using Java or a 3rd party API?
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What are Runtime.getRuntime().totalMemory() and freeMemory()?
...ding to the API
totalMemory()
Returns the total amount of memory in the Java virtual machine. The value returned by this method may vary over time, depending on the host environment.
Note that the amount of memory required to hold an object of any given type may be implementation-dependent.
maxM...
How can a string be initialized using “ ”?
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Java String is Special
The designers of Java decided to retain primitive types in an object-oriented language, instead of making everything an object, so as to improve the performance of the language. Primitives are store...
Creating an array of objects in Java
I am new to Java and for the time created an array of objects in Java.
8 Answers
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Different results with Java's digest versus external utilities
I have written a simple Java class to generate the hash values of the Windows Calculator file. I am using Windows 7 Professional with SP1 . I have tried Java 6.0.29 and Java 7.0.03 . Can someone tell me why I am getting different hash values from Java versus (many!) external utilities and/or ...
How can I interrupt a ServerSocket accept() method?
... Strange, that there is no this info in docs: download.oracle.com/javase/6/docs/api/java/net/… method is not marked as throwing SocketException. It is only mentioned here download.oracle.com/javase/1.4.2/docs/api/java/net/…
– Vladislav Rastrusny
Ap...