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// 抽象类 abstract class Second { public String fname = "John"; public int age = 24; public abstract void study(); // 抽象方法 } // 子类 class Student extends Second { public int graduationYear = 2018; public void study() { // 这里实现抽象方法 System.out.println("Studying all day long"); } } class Main { public static void main(String[] args) { // 创建一个 Student 类的对象 Student myObj = new Student(); System.out.println("Name: " + myObj.fname); System.out.println("Age: " + myObj.age); System.out.println("Graduation Year: " + myObj.graduationYear); myObj.study(); // 调用抽象方法 } }
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