有会java的哥吗？现在急需要代码解答

Question

Java程序设计 4道题求解 题目在图片上，qiu代码🙏🙏↓谢谢 已挂悬赏

Answer 1

class Student {  
    String name;  
    int ID;   
    
    Student(String name, int ID){
        this.name = name;
        this.ID = ID;
    }
    
    void print0() {
        System.out.println(name + "," + ID);
    }
}  

class CollegeStudent extends Student{  
    String major;
    
    CollegeStudent(String name, int ID, String major){
        super(name, ID);
        this.major = major; 
    }  
    
    void print0() {
        super.print0();
        System.out.println(major);
    }
}

class Test{
    public static void main(String[] args) {       
        CollegeStudent cs = new CollegeStudent("John", 101, "Computer Science");
        cs.print0();    
    }  
}