Friday, March 25, 2022
Static Blocks in Java
Static blocks executed only once when the class is loaded into the memory for the first time.
public class Main { { System.out.println("inside instance block"); } static { System.out.println("inside static block"); } public static void main(String[] args) { new Main(); new Main(); System.out.println("Main Program "); } } //output inside static block inside instance block inside instance block Main Program
- A static block will be executed even if there is no main method, for example we print something on the console without creating main() method.
class Main { static { System.out.print("Static block without main method"); } } //output (works only if JDK version is 1.6 or previous) Static block without main method
- Static blocks gets executed before the constructor
- Static blocks are used for the initialization of static variables
- A class can have any number of static blocks, and they can appear anywhere in the class body.
- If there are multiple static blocks then those will be executed from top to bottom.
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