1、/ 這個程序，可以完成基本的學生成績管理，可以對學生增加，刪除和按平均分排序等基本操作 / 希望下載的朋友們可以看懂，學到一點知識 package Student;public class Student privateStringid; /學號privateStringname ;/ 姓名privateintengl; /英語成績privateintmath; /數學成績privateintcomp; /計算機成績privatedouble aver ;/ 平均分privateStudentstudents ; /學生publicstaticintsize= 0;/人數Student() ;

2、int engl, int math, int comp) size+;this. id = id;this. name =name;this. engl =engl;this. math =math;this. comp =comp;aver= average();Student(String id, String name,this. id = s.id ;this. name =new String(sthis. engl = s.engl ;this. math = s.math ;this. comp = p ;this. aver = s.average();public

3、Student(Student s) name );public void insertsort() / 按平均分排序Student temp =new Student();for ( int i = 0; i <size ; i+)for ( int j = 0; j <size - i - 1; j+) if ( students j. aver > students j + 1. temp = students j; students j = students j + 1; students j + 1 = temp;aver ) public Student getS

4、tudents() return students ;public boolean addStudent(Student addstudent) / this.students=new Studentsize;boolean flag= false ;/ 增加學生for ( int i=0;i< size -1;i+)if (addstudent. id .equals( students i. id ) flag= true ;break ;if (flag= false )students size - 1 = addstudent;return true ;else/ 按學號刪除學

5、生return false ;public boolean subStudent(String id) int i;for (i = 0; i <size ; i+) if (id.equals( students i. id ) break ;else return false ;int top = i;for ( int j = top + 1; j <size ; j+) students j - 1 = students j; size -;return true publicvoid setStudents(Student students) this. students

6、 =newStudent100;for( int i = 0; i <size ; i+)this . studentsi =new Student(studentsi);doubleaverage() return ( engl +math+ comp ) / 3;String getId() return id ;String getName() return name;int getEnglish() return engl ;int getMath() return math ;int getComputer() return comp;double getAverage() r

7、eturnaver ;int getSize() return size ;public void fan ilize() size -;for (int i = 0; ii <size ; i+)s = s + ""+ stude nts i.getId()+ "t"+ stude nts i.getName()+"t "+stude ntsi.getE nglish() +"t"+stude ntsi.getMath() +"t"+stude ntsi.getComputer()+&q

8、uot;t"+stude nts i.getAverage() +"n"public Stri ng toStri ng() Stri ng s;s = " "+ "學號"+ "t"+ "姓名"+ "t"+ "英語"+ "t"+ "數學"+ "t"+ "計算機” +"t"+"平均分n"return s;public class textS

9、tude nt * param args*/public static void main( Stri ng args) / TODO Auto-ge nerated method stub/ ArrayListvStude nt> stude nts = new ArrayListvStude nt>();/* Stude ntstude nts;students= new Student5;* 5; i+) studentsi= new Student(getAStudent(i* stu = new Stude nt(); stu.setStude nts(stude nts

10、);*int i; for (i = 0;+ 1); StudentStude nti+1;增加學生");Student student1=new* for(int j=0;j<5;j+)student1j=studentsj; student1i=new* Student(getAStudent(i+1); stu.setStudents(student1);* 添加成功 ");*/Student students;students =new Student3;int i;for (i = 0; i < 3; i+) studentsi = new Stude

11、nt( getAStudent (i + 1);Student stu =new Student();stu.setStudents(students);int n;Scanner Keyboard = new Scanner(System. in );/System.clear();do " 請選擇操作 " );"n" );menu ();System. out .println( n = Keyboard.nextInt(); System. out .println( switch (n) case 1:System. out .println(&

12、quot; 增加學生 " );if (stu.addStudent( getAStudent (+i)System. out .print( "n 添加成功 " ); else System. out .print( " 已經有此學號了，添加失敗 " ); i-;break ;case 2:System. out .print( " 輸入要刪除的學生學號： " );String str=Keyboard.next();if (stu.subStudent(str)System. out .println( " 刪除

13、成功 " );i-;else System. out .print( " 沒有找到 , 刪除失敗 a" );break ;case 3:" 人 " );System. out .println( " 所有學生的信息： " + " 共 " + Student. size +System. out .println(stu); break ;case 4:System. out .print( " 按平均分排序， " );stu.insertsort();System.System. br

14、eak ;out .println(" 排序后的結果： " );out.print(stu);case 0:System. break ;out.println(" 成功退出 " );default :System.out.println(" 輸入錯誤，請從新輸入 "break while (n != 0); staticStudent getAStudent(Scanner Keyboard = Student studenti; System. out .println(int i) new Scanner(System. in

15、);" 輸入第 " + i +" 個學生的信息 :" )System. out .print( " 學號 :" ); String id = Keyboard.next();System. out .print( " 姓名 :" ); String name = Keyboard.next();System. out .print( " 英語成績 :" ); int eng = Keyboard.nextInt();System. out .print( " 數學成績 :" ); int math = Keyboard.nextInt();System. out .print( " 計算機成績 :" ); int comp = Keyboard.nextInt();studenti = new Student(id, name, eng, math, comp);return studenti; static voidmenu() Sy