Static Block and main() method in Java
Last Updated :
20 Dec, 2018
In Java static block is used to initialize the static data members. Important point to note is that static block is executed before the main method at the time of class loading.
This is illustrated well in the following example:
class staticExample {
static
{
System.out.println("Inside Static Block.");
}
public static void main(String args[])
{
System.out.println("Inside main method.");
}
}
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One question arises from the above example:
Question: Can we execute a Java class without declaring main() method?
Answer: No since JDK 1.7 it is not possible to execute any java class without main() method. But it was one of the ways till JDK 1.6.
Example:
class staticExample {
static
{
System.out.println("Inside Static Block.");
System.exit(0);
}
}
|
Output:(In JDK 1.6)
Inside Static Block.
But from JDK 1.7 onwards the above code gives an error in output.
Output:
Error: Main method not found in class staticExample, please define the main method as:
public static void main(String args[])
or a JavaFX application class must extend javafx.application.Application
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