1. The method name of the constructor must be exactly the same as the class name in which it is defined, and there is no return type;
2. There must be a constructor method in the class, even if you If you don’t write it, the system will automatically add a parameterless constructor. The interface is not allowed to be instantiated, so there is no construction method in the interface;
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3. The construction method cannot be static , final, synchronized, abstract and native and other keyword modifications;
4. The constructor is automatically executed when initializing the object, and generally cannot be called explicitly and directly. When there are multiple constructors in the same class, the Java compilation system will automatically correspond one-to-one according to the number of parameters in the last parentheses during initialization and the parameter types to complete the constructor call.
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