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How to convert byte array to string and vice versa?
...are a bunch of encodings you can use, look at the Charset class in the Sun javadocs.
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Why does Hibernate require no argument constructor?
...r proper dependency injection and for rich object behaviour). Furthermore, Java reflection allows you to create objects without using newInstance(). The method getDeclaredConstructors has been in the reflection API since JDK 1.1. It's terrifying that the JPA spec designers neglected this.
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How to create our own Listener interface in android?
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Create a new file:
MyListener.java:
public interface MyListener {
// you can define any parameter as per your requirement
public void callback(View view, String result);
}
In your activity, implement the interface:
MyActivity.java:
public cla...
Why I can't change directories using “cd”?
...round this is to use an alias instead:
alias proj="cd /home/tree/projects/java"
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Jackson Vs. Gson [closed]
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Jackson and Gson are the most complete Java JSON packages regarding actual data binding support; many other packages only provide primitive Map/List (or equivalent tree model) binding.
Both have complete support for generic types, as well, as enough configurabilit...
File name? Path name? Base name? Naming standard for pieces of a path
... A (filename without extension), you could use stem. References: doc.rust-lang.org/std/path/struct.Path.html#method.file_stem , llvm.org/docs/doxygen/html/… , boost.org/doc/libs/1_60_0/libs/filesystem/doc/…
– wisbucky
Mar 17 '16 at 20:53
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What does “atomic” mean in programming?
In the Effective Java book, it states:
6 Answers
6
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How can I use grep to find a word inside a folder?
...rent directory)
grep -nr 'MobileAppSer*' . (Would find MobileAppServlet.java or MobileAppServlet.class or MobileAppServlet.txt; 'MobileAppASer*.*' is another way to do the same thing.)
To check more parameters use man grep command.
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HashMap get/put complexity
...s to the same bucket, thus O(N) if each bucket is backed by a List.
since Java 8, HashMap dynamically replaces the Nodes (linked list) used in each bucket with TreeNodes (red-black tree when a list gets bigger than 8 elements) resulting to a worst performance of O(logN).
But, this in NOT the full...
How to convert comma-separated String to List?
Is there any built-in method in Java which allows us to convert comma separated String to some container (e.g array, List or Vector)? Or do I need to write custom code for that?
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