以下程序运行结果是（  ）

class Preson {
    public Preson() {
        System.out.println("is Preson");
    }
}

public class Teacher extends Preson {
    private String name = "tom";
    public Teacher() {
        System.out.println("is Teacher");
        super();
    }

    public static void main(String[] args) {
        Teacher t = new Teacher();
        System.out.print(this.name);
    }
}