Java中的匿名代码块

Anonymous code blocks in Java

https://stackoverflow.com/questions/1563030/anonymous-code-blocks-in-java

Question:

Are there any practical uses of anonymous code blocks in Java?

public static void main(String[] args) {
    // in
    {
        // out
    }
}

Please note that this is not about named blocks, i.e

name: { 
     if ( /* something */ ) 
         break name;
}

Answer:

They restrict variable scope.

public void foo()
{
    {
        int i = 10;
    }
    System.out.println(i); // Won't compile.
}

In practice, though, if you find yourself using such a code block that's probably a sign that you want to refactor that block out to a method.