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Static code block: declared static, executed when jvm loads the class, executed only once.

Construction code block: Defined by {}, executed each time an object is created.

Constructors: The constructor is invoked as soon as the object is created.

static code block

1. It is executed as the class is loaded, only once, and better than the main function, static code blocks are called by the class. Class, execute the static code block first, and then execute the main function. 2. Static code blocks are for class initialization, construction code blocks are for object initialization. 3. Variables in static code blocks are local variables, just like local variables in ordinary functions. 4. There can be multiple static code blocks in a class.

static{} construct code block

1. The constructor code block initializes the object, runs the constructor code block as soon as the object is created, and executes before the constructor. Constructor blocks are run only when objects are created, classes cannot invoke constructor blocks. 2. Constructor code blocks are initialized uniformly for objects, while constructors are initialized for specific objects. There may be multiple constructors, and different initializations will be performed without calling constructors, while constructor code blocks will be executed.

{} constructor

1. Once the object is created, it calls the constructor, which means that it doesn't call the constructor until it's created. 2. Constructors initialize objects. 3. When an object is created, the constructor is called only once, whereas normal functions are called multiple times.

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