BLOCK IN JAVA:-
A block in Java is a group of one or more statements enclosed in braces.A block start with ( { ) and ends with ( } ).
A block statement is generally used to group together several statements, so they can be used in a situation that requires you to use a single statement.
Java support two types of block in java
1)Static Block
2)Non-static Block
Static Block
- Static keyword can be used with class, variable, method and block.
- Static block is used for initializing the static variables.
- The static block will be called only once and it will be the first time you are accessing the class.
- If the block declared with the static keyword is known as the static block.
- Static block always executes before the main method called by JVM.
- The existence of the main method always checks before executing the static block(1.8.0 JDK).
- Static block always execute for a single time only
PROGRAM
class Test
{
static //Static Block
{
System.out.println("I am in static block");
String x[]={"1","2"};
main(x);
}
public static void main(String[] args)
{
System.out.println("main()...."+args[0]);
}
}
O/P
I am in static block
main()….1
Non-static Block
- The block declares without any static keyword is called nonstatic block.
- Nonstatic blocks are the class level block which does not have the prototype
- The block will execute before constructor called by the user.
PROGRAM
class Test
{
Test()
{
System.out.println("i am in constructor");
}
static
{
System.out.println(" i am in static block");
}
public static void main(String[] args)
{
System.out.println("i am in main method");
Test t1=new Test();
}
{
System.out.println(" i am in nonstatic block");
}
}
O/P I am in static block
I am in the main method
I am in nonstatic block
I am in constructor