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What is the main Use Static block ?

 
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We can write static blocks in java like

static {

.....
......

}

Here we can initailise the varaibles before its construcor runs.

Do we have any another use of the Static block ?
 
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Actually that code is run when the class is loaded. Even when there will never be any object created, the code will still run. What you are thinking about are initializer blocks, which are the same but without the static keyword.

Now these static initializers should be used to run code that are required for a class to function properly. That could be any code required.

One example is loading libraries:
 
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