从另一个java文件中的一个文件扩展java类 [英] Extend a java class from one file in another java file

问题描述

如何将一个java文件包含到另一个java文件中？

How can I include one java file into another java file?

例如：
如果我有2个java文件，则一个名为 Person.java ，其中一个是叫 Student.java 。如何将 Person.java 包含到 Student.java 中，以便我可以从 Person.java in Student.java

For example: If I have 2 java file one is called Person.java and one is called Student.java. How can I include Person.java into Student.java so that I can extend the class from Person.java in Student.java

推荐答案

只需将两个文件放在同一目录中即可。这是一个例子：

Just put the two files in the same directory. Here's an example:

Person.java

Person.java

public class Person {
  public String name;

  public Person(String name) {
    this.name = name;
  }

  public String toString() {
    return name;
  }
}

Student.java

Student.java

public class Student extends Person {
  public String somethingnew;

  public Student(String name) {
    super(name);
    somethingnew = "surprise!";
  }

  public String toString() {
    return super.toString() + "\t" + somethingnew;
  }

  public static void main(String[] args) {
    Person you = new Person("foo");
    Student me = new Student("boo");

    System.out.println("Your name is " + you);
    System.out.println("My name is " + me);
  }
}

运行学生（因为它有主要功能）我们期望的结果：

Running Student (since it has the main function) yields us the desired outcome:

Your name is foo
My name is boo  surprise!

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