static field and method in java

Called

class members

:

class attributes

and

class methods

.

We can use

ClassName.StaticField

and

ClassName.StaticMethod

to access them.

They don’t belong to any instance, so we can’t use

this.StaticMember

,

super.StaticMember

.

Note:

main

method is static, so JVM doesn’t create a instance of the class where

main

is in. As a result,

main

can’t access non-static members of the class unless create instance of that class.

static block: when the class is loaded, the static block in that class is executed, and executed for only one time. Usually used to initialized the class.