Java Course three Classroom example validation

1.ClassAndObjectTest. Java

Verify:

2.objectequals.java

Run:

3.initializeblockdemo.java

Java is initialized in two places: initialization blocks and constructors, where initialization blocks are divided into static initialization blocks and instance initialization blocks. Static initialization blocks are initialization blocks in a class that are decorated with static, and instance initialization blocks are initialization statements that do not have any keyword adornments in the class .

If there is no formal parameter when creating an object in the main function, If a physical parameter is created in the main function, the corresponding constructor in the class is called.

4. Teststaticinitializeblock. Java

If the static modifier is used when defining the initialization block, it becomes a static initialization block. When static initialization blocks are class-dependent, the system executes static initialization blocks during the class initialization phase, rather than when the object is created.

So static initialization blocks are always executed first than normal initialization blocks.

5.strangeintegerbehavior.java

Java Course three Classroom example validation