A deep understanding of Java's static (combined with C-language thinking)

1  Public classStatictest {2 3     4String X = "I am a non-static variable";5     6     7     Static intButterfly =0;8     StaticString staticx = "I am a static variable" ;9     StaticString staticz= "I am also a static variable";Ten      One      A statictest () { -System.out.println ("I Am a Builder"); -     } the      -      -      -      Public Static voidMain (string[] args) { +Statictest this1 =NewStatictest ();//new out of this object is just for the following FANGFA2 (), but it doesn't matter if you use a constructor in a static block. -         //System.out.println (FF3); Error, the variable in the static method is also a temporary variable, not a global +         //System.out.println (Staticy); Error, indicating that even if the amount defined in the static block is a temporary variable, it is not global, nor is it a class A         //THIS.FANGFA2 (); Error, stating that this is an object and cannot be used in the static method at this1.fangfa2 (); -FANGFA4 ();//simply want to explain the need not to use THIS1 reference -          -     } -  -      in     Static{ -Statictest This2 =NewStatictest ();//just to show that you can make a new object in the static block earlier, in order to run the constructor toString staticy = "Staticy"; +         //System.out.println (x); wrong - System.out.println (staticy); the         //this.fangfa1 (); This is wrong, because this is the object that represents itself, is an object value, and static is loaded before the object *FANGFA1 ();//describes static method methods that can be called by a passive block $ //if (true) {} pair, the static block can be used as a non-name, cannot be called a special method, its essence is a static method, but also equivalent to the main method can bePanax Notoginseng //run, and run first than main -     } the      +     Static voidfangfa0 () { ASystem.out.println ("I Am a Butterfly"); the}//This method just wants to show that I like butterflies, no specific use +      -      $      $      -     Static voidfangfa1 () { - System.out.println (staticx); the         //System.out.println (X); wrong, because static methods cannot call non-static quantities - System.out.println (Fangfa3 ());Wuyi         //System.out.println (FF3); error, FF3 even though it is defined in a static method, it is still a temporary variable, but if you precede it with static, it will not be wrong. the          -          Wu     } -      About     StaticString Fangfa3 () { $String FF3 = "I am fangfa3"; -         returnFF3; -          -     } A      +     Static voidfangfa4 () { the fangfa0 ();  -     } $      the      the     voidfangfa2 () { theSystem.out.println (Staticz);//static methods can call static quantities the          This. X = "2"; -     } in      the      the      About } the /*Printing results:*/ the //I'm the constructor . the //Staticy + //I am a static variable - //I'm fangfa3 . the //I'm the constructor .Bayi //I'm also a static variable the //I'm a butterfly . the  -  - /*Summary process: 1, static loading and initialization: The static amount (variables and methods) initialization, the initialization of the method means that the variable name is assigned to the pointer; the initialization of the variable is the * Assign a general data type directly to this variable the * 2, static execution: Then the contents of the static block execution, it is equivalent to the main method is executed first, is the static execution of the portal like "main", the * 3, non-static loading and initialization: the rotation of non-static variables and methods of loading and its assignment the * 4, the implementation of the constructor - * 5, non-static execution: Execution of the Main method the * Note: the assignment and invocation of the method is 2 concepts, the assignment of the method is the assignment of the address pointer to the indirect variable of the method name, and the method call is called this method the * Note: There are non-static blocks not mentioned the * Note: Execute and load and initialize these 3 concepts must distinguish between94 * Note: Static is common to all objects of this class, that is, only these 1, not the static amount is each object itself has one, like the first new variable X,THIS2. X and this1.x are not the * Same One the * Note: Because the static amount is common, it is better to call it directly before adding the object name, which helps to understand the concept. the  */

A deep understanding of Java's static (combined with C-language thinking)