首先是HelloWorld.java

package my;public class HelloWorld {public static void main(String[] args){ Student s1=new Student();s1.id="20180103";s1.name="張三";s1.sex=true;s1.cellphone="18888888888";s1.weight=100;s1.height=170;s1.showHeightAndWeight();}}
Man.java

package my;public class Man {public int height;public int weight;public void showHeightAndWeight() {System.out.println("height is"+height+", weight is"+weight);} }
Student.java

package my;public class Student extends Man {public String id;public String name;public boolean sex;public String cellphone;public StudentCards cards=new StudentCards();@Overridepublic void showHeightAndWeight(){super.showHeightAndWeight();System.out.println(id+name+sex+cellphone);}}
StudentCards.java

package my;public class StudentCards {private String SchoolCardNum;private String BankCardNum;public String getSchoolCardNum(){return SchoolCardNum;}public void setSchoolCardNum(String schoolCardNum){SchoolCardNum = schoolCardNum;}public String getBankCardNum(){return BankCardNum;}public void setBankCardNum(String bankCardNum){BankCardNum = bankCardNum;}}

如何用eclipse重寫，如下圖所示：

運行結果如下：

@Override這行也是有用的，不要刪掉。

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