studetiherit.java

java课程的资料以及实验的代码

class Student {
	public void toPrint()
     {
     System.out.println("Parent class "+"Student");	
     }
	}
class Graduate extends Student {
		public void toPrint()
     {
     System.out.println("Child class "+"Graduate");	
     }
	}
class UndergraduateStudent extends Student {
		public void toPrint()
     {
     System.out.println("Child class "+"UndergraduateStudent");	
     }
     }
public class StudetIherit {
 public static void main(String []args) {
  UndergraduateStudent s1 = new UndergraduateStudent();
  Graduate s2=new Graduate();
  Student x=new Student();
  x.toPrint();
  x=s1;
  x.toPrint();
  s2=(Graduate)x;
  s2.toPrint();
  
} 
}