本文共 1202 字，大约阅读时间需要 4 分钟。

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="张三";		s1.sex=true;		s1.cellphone="18888888888";		s1.weight=100;		s1.height=170;		s1.showHeightAndWeight();	}}

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

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

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重写，如下图所示：

运行结果如下：

@Override这行也是有用的，不要删掉。

转载地址：https://it1995.blog.csdn.net/article/details/78982069 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！