Java protected 关键字

实例

Student 子类访问具有 protected 受保护属性的 Person 类:

class Person {
  protected String fname = "John";
  protected String lname = "Doe";
  protected String email = "john@doe.com";
  protected int age = 24;
}
class Student extends Person {
  private int graduationYear = 2018;
  public static void main(String[] args) {
    Student myObj = new Student();
    System.out.println("Name: " + myObj.fname + " " + myObj.lname);
    System.out.println("Email: " + myObj.email);
    System.out.println("Age: " + myObj.age);
    System.out.println("Graduation Year: " + myObj.graduationYear);
  }
}

定义与用法

protected 关键字是一个访问修饰符，用于属性、方法和构造函数，使它们可以在同一个包和子类中访问。

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