Which classes in Java are descendants of the Object class?

In Java, all classes except primitive types implicitly inherit from the java.lang.Object class. This means that any user-defined class, as well as all built-in Java classes, are descendants of Object. For example, if you create a class class MyClass {}, it automatically inherits methods from Object, such as toString(), equals(), hashCode(), getClass(), and others.

Therefore, all classes in Java, except primitive types (int, boolean, etc.), are descendants of Object.

Example:

class MyClass {
    // this class inherits from Object automatically
}

MyClass obj = new MyClass();
System.out.println(obj.toString()); // method from Object