java的初始化

public class Base {
    private String baseName = "base";
    public Base() {
        callName();
    }
    public void callName() {
        // TODO Auto-generated method stub
        System.out.println(baseName);
    }
    static class Sub extends Base {
        private String baseName = "sub";
        public void callName() {
            System.out.println(baseName);
        }
    }
    public static void main(String[] args) {
        Base sub = new Sub();
    }
}