利用單向鏈表-實現(xiàn)學生管理系統(tǒng)java練習

1、精選優(yōu)質文檔-傾情為你奉上Java作業(yè)：4-13.參照例4-23，利用單向鏈表，實現(xiàn)學生管理系統(tǒng)。解：運行圖：A. 主菜單B. 增加學生并且打印學生信息C. 刪除學生信息D. 修改學生信息E. 查找學生信息代碼實現(xiàn)：(1).單向鏈結點LinkListElement類public class LinkListElement protected Object data;protected LinkListElement nextElement;public LinkListElement(Object v ,LinkListElement next)data=v;nextElement=next;

2、public LinkListElement(Object v)data=v;nextElement=null;public LinkListElement next()return nextElement;public void setNext (LinkListElement next)nextElement=next;public Object value()return data;public void setValue (Object value)data=value;（2）.單向鏈表LinkList類描述public class LinkList protected int cou

3、nt;protected LinkListElement head;public LinkList()head=null;count=0;public boolean isEmpty()return count=0;public void addToTail(Object value)LinkListElement temp=new LinkListElement(value,null);if(head!=null)LinkListElement finger=head;while(finger.next()!=null)finger=finger.next();finger.setNext(

4、temp);else head=temp;count+;public Object remove(Object value)LinkListElement finger=head;LinkListElement previous=null;while(finger!=null&&!finger.value().equals(value)previous=finger;finger=finger.next();if(finger!=null)if(previous=null)head=finger.next();elseprevious.setNext(finger.next()

5、;count-;return finger.value();return null;（3）.封裝好的學生類import java.io.*;public class Student public String id;public String name;public String grade;public String sclass;public String qq;public static InputStreamReader isr=new InputStreamReader(System.in);public static BufferedReader br= new BufferedR

6、eader(isr);public String getId() return id;public void setId(String id) this.id = id;public String getName() return name;public void setName(String name) = name;public String getGrade() return grade;public void setGrade(String grade) this.grade = grade;public String getSclass() return scla

7、ss;public void setSclass(String sclass) this.sclass = sclass;public String getQq() return qq;public void setQq(String qq) this.qq = qq;public Student(String id, String name, String grade,String sclass,String qq )this.id=id; =name;this.grade=grade;this.sclass=sclass;this.qq=qq;public Student

8、()throws ExceptionSystem.out.println("輸入學生學號");id=br.readLine();System.out.println("輸入學生姓名");name=br.readLine();System.out.println("輸入學生年級");grade=br.readLine();System.out.println("輸入學生班級");sclass=br.readLine();System.out.println("輸入學生qq");qq=br.read

9、Line();（4）.學生信息管理的接口類public interface StudentDataBaseInterface void addStudent(Student s)throws Exception;void removeStudent(String name);void updateStudent(String name)throws Exception;void findStudent(String name);void listAll();(5).學生信息管理manage類import java.io.BufferedReader;import java.io.InputSt

10、reamReader;public class Manage extends LinkList implements StudentDataBaseInterfacepublic static InputStreamReader isr=new InputStreamReader(System.in);public static BufferedReader br= new BufferedReader(isr);public static void main(String args) throws Exception int i=1;Manage m=new Manage();System.

11、out.println("歡迎進入學生管理系統(tǒng)");System.out.println("請選擇：1.增加學生，2.刪除學生，3.修改學生，" +"4.查找學生，5.打印學生,其他鍵.退出");i=Integer.parseInt(br.readLine();while(i>0&&i<6)switch(i)case 1:Student s=new Student();m.addStudent(s);break;case 2:System.out.println("請輸入要刪除學生的名字"

12、;);String name;name=br.readLine();m.removeStudent(name);break;case 3:System.out.println("請輸入要修改學生的名字");String name1;name1=br.readLine();m.updateStudent(name1);break;case 4:System.out.println("請輸入要查找學生的名字");String name2;name2=br.readLine();m.findStudent(name2);break;case 5:m.listA

13、ll();break;System.out.println("請選擇：1.增加學生，2.刪除學生，3.修改學生，" +"4.查找學生，5.打印學生,其他鍵.退出");i=Integer.parseInt(br.readLine();m.listAll();public Manage()super();Overridepublic void addStudent(Student s) throws Exception / TODO Auto-generated method stubaddToTail(s);Overridepublic void remo

14、veStudent(String name) / TODO Auto-generated method stubLinkListElement finger=head;while(finger!=null)Student s=(Student)finger.value();if(s.getName().equals(name)remove(s);System.out.println("成功刪除: 學號："+s.getId()+" 姓名："+s.getName()+" 年級："+s.getGrade()+" 班別："

15、+s.getSclass()+" qq:"+s.getQq();break;elsefinger=finger.next();Overridepublic void updateStudent(String name) throws Exception / TODO Auto-generated method stubLinkListElement finger=head;while(finger!=null)Student s=(Student)finger.value();if(s.getName().equals(name)System.out.println(&qu

16、ot;成功找到: 學號："+s.getId()+" 姓名："+s.getName()+" 年級："+s.getGrade()+" 班別："+s.getSclass()+" qq:"+s.getQq();System.out.println("輸入學生新學號");s.setId(br.readLine();System.out.println("輸入學生新姓名");s.setName(br.readLine();System.out.println("輸入學

17、生新年級");s.setGrade(br.readLine();System.out.println("輸入學生新班級");s.setSclass(br.readLine();System.out.println("輸入學生新qq");s.setQq(br.readLine();System.out.println("成功修改: 學號："+s.getId()+" 姓名："+s.getName()+" 年級："+s.getGrade()+" 班別："+s.getScl

18、ass()+" qq:"+s.getQq();break;elsefinger=finger.next();Overridepublic void findStudent(String name) / TODO Auto-generated method stubLinkListElement finger=head;while(finger!=null)Student s=(Student)finger.value();if(s.getName().equals(name)System.out.println("成功找到: 學號："+s.getId()

19、+" 姓名："+s.getName()+" 年級："+s.getGrade()+" 班別："+s.getSclass()+" qq:"+s.getQq();break;elsefinger=finger.next();Overridepublic void listAll() / TODO Auto-generated method stubLinkListElement finger=head;int i=1;while(finger!=null)Student s=(Student)finger.value()

20、;System.out.println("序號"+i+": 學號："+s.getId()+" 姓名："+s.getName()+" 年級："+s.getGrade()+" 班別："+s.getSclass()+" qq:"+s.getQq();i+;finger=finger.next();補充題：1. 設計一個Java源程序,用來創(chuàng)建一個圖形類Shape,由它派生出矩形Rectangle和圓形Circle并計算及顯示出相應圖形的面積和周長.(1)使用繼承方法:ShapeTe

21、st.java;A. Shape類 public class Shape protected int x;protected int y;protected int r;protected Shape(int x, int y,int r)this.x=x;this.y=y;this.r=r;public void length(int x, int y,int r)System.out.println("周長");public void square(int x, int y,int r)System.out.println("面積");B. 繼承方法

22、:ShapeTestpublic class ShapeTest extends Shapefloat Pi = 3.14f;protected ShapeTest(int x, int y,int r) super(x, y, r);public void length(int x, int y,int r)System.out.println("矩形周長"+(2*x+2*y);System.out.println("圓形周長"+(2*Pi*r);public void square(int x, int y,int r)System.out.prin

23、tln("矩形面積"+x*y);System.out.println("圓形面積"+(Pi*(float)Math.pow(r, 2.0);public static void main(String args) int x=4;int y=4;int r=3;System.out.println("當x=4,y=3,r=3時有：");ShapeTest st=new ShapeTest(x, y,r);st.length(x,y,r);st.square(x, y, r);程序運行圖：(2)使用抽象方法:ShapeTest1.jav

24、a;A.abstract class Shape abstract double area(); abstract double perimeter();public class Rectangle extends Shapeprivate double length;private double hight;public Rectangle(double length, double hight)this.length = length ;this.hight = hight;Overridepublic double area() return length*hight;Overridep

25、ublic double perimeter() return 2*(length+hight);B.public class Circle extends Shapedouble radius;public Circle(double radius)this.radius = radius;Overridepublic double area() return Math.PI*radius*radius;Overridepublic double perimeter() return 2*Math.PI *radius;C.public class ShapeTest1 public sta

26、tic void main(Stringargs)Rectangle rec = new Rectangle(4,5);System.out.println("矩形的面積為："+rec.area();System.out.println("矩形的周長為："+rec.perimeter();Circle cir = new Circle(5);System.out.println("愿的面積為："+cir.area();System.out.println("圓的周長為："+cir.perimeter();(3)使用

27、接口方法:ShapeTest2.java;A.接口類 public interface ShapeInterface void length(int x, int y,int r);void square(int x, int y,int r);B. 接口方法ShapeTest2public class ShapeTest2 implements ShapeInterface float Pi = 3.14f;public static void main(String args) int x=4;int y=4;int r=3;System.out.println("當x=4,y=

28、3,r=3時有：");ShapeTest st=new ShapeTest(x, y,r);st.length(x,y,r);st.square(x, y, r);Overridepublic void length(int x, int y, int r) System.out.println("矩形周長"+(2*x+2*y);System.out.println("圓形周長"+(2*Pi*r);Overridepublic void square(int x, int y, int r) System.out.println("矩

29、形面積"+x*y);System.out.println("圓形面積"+(Pi*(float)Math.pow(r, 2.0);運行圖如1；5-6.編寫一個從鍵盤讀入10個字符放入一個字符數(shù)組，并在屏幕顯示讀入的字符程序，同時處理數(shù)組越界異常。解：import java.io.BufferedReader;import java.io.InputStreamReader;public class ReadChar public static InputStreamReader isr=new InputStreamReader(System.in);public

30、static BufferedReader br= new BufferedReader(isr);public static void main(String args) throws Exception / TODO Auto-generated method stubString str;char x=new char10;System.out.println("請輸入一串字符串");str=br.readLine();for(int i=0;i<str.length();i+)try xi=str.charAt(i);System.out.println("第一個字母是"+xi); catch (Exception e) / TODO Auto-generated catch blockif(i>10)System.out.println("字母"+str.charAt(i)+"數(shù)組越界了");運行圖補充題:2.編寫Java程序，要求：（1）自定義一個三角形類Triangle,該類包