Java protected 关键字

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  定义和用法

  protected关键字是用于属性，方法和构造函数的访问修饰符，使他们在同一个包和子类访问。
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  示例

  Student子类访问Person与类protected属性：

  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);
    }
  }
  

  尝试一下
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  相关页面

  Java 教程：Java 修饰符