Several cases that do not initialize classes

public class P {
    public static int abc = 123;
    static{
        System.out.println("P is init");
    }
}
public class S extends P {
    static{
        System.out.println("S is init");
    }
}
public class Test {
    public static void main(String[] args) {
        System.out.println(S.abc);
    }
}

P is init<br />123

Several classes that do not initialize subclasses

1. Called by the parent class static Methods or fields

2. Called by the parent class final Methods or fields

3. Reference by array