Java Free blocks (static and non-Static) (reprinted)

Free blocks in Java are divided into two types:

Static blocks and non-static blocks

Static blocks:

 Public class Test {2     Static int x = ten; 3     // static block: The execution time of a static block is when the class file is loaded , and the static block executes 4     / more static blocks at a time, in the order of occurrence 5     static{6         x+=5; 7     }8 }

Non-static blocks:

 Public class Test {2     // non-static blocks: Each time an object is initialized, a non-static block is executed, and a 3//inheritance relationship is performed before the constructor executes: the constructor of the parent class, the      non-static block of the parent class, and its own free block, Own constructor 4     {5         System.out.println ("before"); 6     }7}

Test Demo:

  Public classTest {2 3Static intx = 10; 4//static blocks: The execution time of a static block is when the class file is loaded, and the static block executes only once5//multiple static blocks, executed in order of occurrence6Static{ 7 x+=5; 8     } 9 Public Static voidMain (string[] args) {10NewTest ();11System.out.println (x);12     }13//static Block14Static {X/=3;16     }17 PublicTest () {System.out.println ("constructor");19     }20//non-static blocks: Each initialization of an object results in the execution of a non-static block, which executes before the constructor executes21st//Inheritance Relationship: The constructor of the parent class, the non-static block of the parent class, and its own constructor, the free block,22     {System.out.println ("Before");24     }25}

Console output:

before constructor 5

Java Free blocks (static and non-Static) (reprinted)