java - 编译时JVM不提供构造函数

Question

当我们在类中创建任何构造函数(无论是默认构造函数还是带参数构造函数)时，JVM 为什么在编译时不提供构造函数？

Answer 1

以下是 Java 语言规范的摘录:

If a class contains no constructor declarations, then a default constructor that takes no parameters is automatically provided:

• If the class being declared is the primordial class Object, then the default constructor has an empty body.
• Otherwise, the default constructor takes no parameters and simply invokes the superclass constructor with no arguments.

事实上，只要类不包含构造函数声明，JVM 就会“提供”默认构造函数。与此相同

public MyClass() {}