本文通过一个具体的Java程序示例，展示了类之间的继承关系及其在实际编程中的应用。从基础的人类类开始，逐步扩展到学生类，最后细化到研究生类，并在主方法中创建对象演示了如何访问继承下来的属性。
class Human1 {
public String name ="？？？" ;
public int age = 100;
}
class Student1 extends Human1{
public double score = 66.6;
}
class Graduate extends Student1 {
public String daoshi = "？？？";
}
public class JiCheng{
public static void main(String[]args){
Graduate gd = new Graduate();
System.out.print(gd.name+" "+gd.score+"\t"+gd.age);
}
}
public String name ="？？？" ;
public int age = 100;
}
class Student1 extends Human1{
public double score = 66.6;
}
class Graduate extends Student1 {
public String daoshi = "？？？";
}
public class JiCheng{
public static void main(String[]args){
Graduate gd = new Graduate();
System.out.print(gd.name+" "+gd.score+"\t"+gd.age);
}
}
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