Java ??????? ?? ??? ?? ??? ?? ?? ?? ??? ????. ? ????? ?? ??? ?? Java? ??? ?? ??(?? ??, ???? ??? ??, ???, ??? ?)? ??? ????? ???????.

?? ?? ?? ?? Java ??? ??? ?? ???? ? ???? ?? ??? ??? ?? ???.

public class Execute {
    public Execute() {
        System.out.println("Hello from constructor");
    }

    public void method() {
        System.out.println("Hello from method");
    }

    static {
        System.out.println("Hello from static block");
    }

    {
        System.out.println("Hello from instance initializer block");
    }

    public static void main(String[] args) {
        System.out.println("Hello from main");
        Execute obj = new Execute();
        obj.method();
    }
}

??

?? ?? ??? ???? ?? ??? ? ?? ????? ?????.

? Java ??? ??? ??? ????.

Hello from static block
Hello from main
Hello from instance initializer block
Hello from constructor
Hello from method

???? ???????

?? ? Java? ?? ?? ??? ??? ??? ?????.

??

? ?? ??? ???? ? ?? ??? ??? ????

1. ?? ??
2. ?? ??
3. ???? ??? ??
4. ???
5. ??? ??

?? ? ??? ??? ???????

1. ?? ??

static {
    System.out.println("Hello from static block");
}

Java? ?? ??? JVM(Java Virtual Machine)? ???? ???? ??? ? ? ? ???? ?? ?????. ?? ?? ???? ?? ???? ?? ??? ???? ?? ?????.

?? ??? ????? ???? ?? ??? ? ??? ??? ???? ? ?? ???? ?? ?????.

? ???? ? ?? ?? ?? ?? ??? ?? ????.

Hello from static block

2. ?? ??

public static void main(String[] args) {
    System.out.println("Hello from main");
    Execute obj = new Execute();
    obj.method();
}

?? ???? ?? Java ??????? ??????. ????? ??? ? ??? ???? ????.

?? ??? ??? ? JVM? ?? ??? ??? ?? ??? ?????.

? ???? ? ?? ?? ?? main ???? ?? ????.

Hello from main

3. ???? ??? ??

{
    System.out.println("Hello from instance initializer block");
}

Java? ???? ??? ??? ??? ??? ????? ???, ??? ?? ?? ?? ??? ???? ?? ?????. ??? ????? ??? ??? ??? ???? ???? ??? ?????

Execute obj = new Execute();? ??? ???? ???? ??? ????? ?? ?????. ? ??? ??? ?? ??? ????? ? ?????.

? ???? ??? ? ?? ?? Instance Initializer ??? ?? ????.

public class Execute {
    public Execute() {
        System.out.println("Hello from constructor");
    }

    public void method() {
        System.out.println("Hello from method");
    }

    static {
        System.out.println("Hello from static block");
    }

    {
        System.out.println("Hello from instance initializer block");
    }

    public static void main(String[] args) {
        System.out.println("Hello from main");
        Execute obj = new Execute();
        obj.method();
    }
}

4. ???

Hello from static block
Hello from main
Hello from instance initializer block
Hello from constructor
Hello from method

???? ??? ????? ? ???? ?? ????, ? ??? ??? ? ???? ?????. ???? ??? ???? ?? ?? ??? ??? ?? void? ????.

?? ?? ? ???? ??? ?? ??? ?????. ????? ???? ??? ?????? ?? ??? ??? ?? ??? ???? ? ?????.

? ???? ? ?? ?? ?? ???? ?? ????.

static {
    System.out.println("Hello from static block");
}

5. ??? ??

Hello from static block

???? ??? ???? ?? ??? ???? ?? ???? ????? ???? ??? ?????. ???? ??? ???? ?? ???? ???? ??? ???? ???? ??? ?????.

??? ???? ???? ? ????? method() ??? ?????. ??? ??? ?? ??? ??? ?????.

? ???? ??? ??? ?? ??? ??? ?? ????.

public static void main(String[] args) {
    System.out.println("Hello from main");
    Execute obj = new Execute();
    obj.method();
}

?? ??? ? ??????

???? Java ????? ????? ????? ?? ?? ??? ???? ?? ??? ???? ?? ?????. ?? ??:

?? ??? ??? ?? ??? ????? ? ??????.
???? ??? ?? ?? ??? ??? ??????.
???? ??? ??? ???? ? ??????.

? ??? ?? ? ???? ????? ?? ??? ?? Java ??? ??? ? ????.

? ??? ? Java ??? ??? ?? ? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!