/*學生信息管理系統(tǒng)，實現(xiàn)學生信息： 
 *增加 int[] a=new int[9] 
 *刪除 
 *查找 
 *更改 
 */ 
import java.util.Scanner;//導入java輸入流 
import java.lang.*; 
import java.io.*; 
class Student 
{ 
 private static Student[] s=new Student[2]; 
 int n=0; 
 private String name; 
 private int num; 
 private String classAge; 
 
 public void judge()throws IOException 
 { 
 int i; 
 char ch; 
 String str; 
 Scanner In=new Scanner(System.in); 
 if(n==0) 
 { 
  System.out.print("你還沒有錄入任何學生，是否錄入(Y/N):"); 
  str=In.next(); 
  ch=str.charAt(0); 
  while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n') 
  { 
  System.out.print("輸入有誤，請重新輸入:"); 
  str=In.next(); 
  ch=str.charAt(0); 
  } 
  if(ch=='Y'||ch=='y') 
  { 
  this.add(); 
  } 
  if(ch=='N'||ch=='n') 
  { 
  this.menu(); 
  } 
 } 
 } 
 
 public void menu()throws IOException//定義菜單函數(shù) 
 { 
 int a;//定義switch語句變量 
 Scanner in=new Scanner(System.in);//實例化輸入流對象 
 System.out.println("*********學生信息管理系統(tǒng)功能表*********"); 
 System.out.println("*****  1.增加  *****"); 
 System.out.println("*****  2.顯示  *****"); 
 System.out.println("*****  3.修改  *****"); 
 System.out.println("*****  4.刪除  *****"); 
 System.out.println("*****  5.查看  *****"); 
 System.out.println("*****  0.退出  *****"); 
 System.out.println("****************************************"); 
 System.out.print("請選擇(0~5):"); 
 a=in.nextInt(); 
 while(a<0||a>5) 
 { 
  System.out.print("輸入超出范圍，請重新輸入:"); 
  a=in.nextInt(); 
 } 
 switch(a) 
 { 
  case 1:this.add();break; 
  case 2:this.show();break; 
  case 3:this.modif();break; 
  case 4:this.delete();break; 
  case 5:this.look();break; 
  case 0:System.exit(0);break; 
 }  
 } 
 
 public void add()throws IOException//定義增加函數(shù) 
 { 
 String str,str1,str2; 
 int i,num1,t=1; 
 char ch,ch1; 
 FileWriter fw=new FileWriter("F://javaFile//student.txt",true); 
 fw.write("  錄入的學生信息列表\r\n\r\n學號 姓名 班級\r\n"); 
 Scanner In=new Scanner(System.in); 
 while(t==1) 
 { 
  System.out.print("請輸入學生學號:"); 
  num1=In.nextInt(); 
  for(i=0;i<n;i++) 
  { 
  while(s[i].num==num1) 
  { 
   System.out.println("已存在此學號，請重新輸入"); 
   System.out.print("請輸入學號:"); 
   num1=In.nextInt(); 
  } 
  } 
  s[n].num=num1; 
  str2=String.valueOf(num1); 
  fw.write(str2+" "); 
  System.out.println(); 
  System.out.print("請輸入學生姓名:"); 
  s[n].name=In.next(); 
  fw.write(s[n].name+" "); 
  System.out.println(); 
  System.out.print("請輸入學生班級:"); 
  s[n].classAge=In.next(); 
  fw.write(s[n].classAge+"\r\n"); 
  ++n; 
  fw.close(); 
  System.out.println(); 
  System.out.print("是否繼續(xù)添加(Y/N)"); 
  str=In.next(); 
  ch=str.charAt(0); 
  while(ch!='N'&&ch!='n'&&ch!='Y'&&ch!='y') 
  { 
  System.out.print("輸入有誤，請重新輸入:"); 
  str=In.next(); 
  ch=str.charAt(0); 
  } 
  if(ch=='N'||ch=='n') 
  { 
  break; 
  } 
 } 
 System.out.println(); 
 System.out.print("是否返回主菜單(Y/N)"); 
 str1=In.next(); 
 ch1=str1.charAt(0); 
 while(ch1!='Y'&&ch1!='y'&&ch1!='N'&&ch1!='n') 
 { 
  System.out.print("輸入有誤，請重新輸入:"); 
  str1=In.next(); 
  ch1=str1.charAt(0); 
 } 
 if(ch1=='Y'||ch1=='y') 
 { 
  this.menu(); 
 } 
 if(ch1=='N'||ch1=='n') 
 { 
  System.out.println("正在退出...謝謝使用!"); 
  System.exit(0); 
 } 
 } 
 
 public void show()throws IOException 
 { 
 int i; 
 this.judge(); 
 System.out.println("本次操作共錄入"+n+"位學生!"); 
 System.out.println("你錄入的學生信息如下:"); 
 System.out.println(); 
 System.out.println("學號\t\t姓名\t班級"); 
 for(i=0;i<n;i++)    
 { 
  System.out.println(s[i].num+" "+s[i].name+" "+s[i].classAge); 
 } 
 System.out.println("系統(tǒng)返回主菜單!"); 
 this.menu(); 
 } 
 
 public void delete()throws IOException//刪除信息功能實現(xiàn) 注：本功能暫時不具備可擴展性 
 { 
 this.judge(); 
 int j=0,t=0,k=0,num1; 
 char ch; 
 String str; 
 Scanner pin=new Scanner(System.in); 
 System.out.print("請輸入要刪除的學號:"); 
 num1=pin.nextInt(); 
 for(j=0;j<n;j++) 
 { 
  if(s[j].num==num1) 
  { 
  k=1; 
  t=j; 
  } 
 } 
 if(k==0) 
 { 
  System.out.println("對不起！你要刪除的學號不存在！"); 
  System.out.println("系統(tǒng)將返回主菜單！"); 
  this.menu(); 
 } 
 if(k==1) 
 { 
  System.out.println("你要刪除的學生信息如下:");//打印管理員要刪除的學生信息 
  System.out.println("學號\t姓名\t班級");//本功能暫時不備擴展性 
  System.out.println(s[t].num+" "+s[t].name+" "+s[t].classAge); 
  System.out.println(); 
  System.out.print("你確定要刪除(Y/N):"); 
  str=pin.next(); 
  ch=str.charAt(0); 
  while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n') 
  { 
  System.out.print("輸入有誤，請重新輸入:"); 
  str=pin.next(); 
  ch=str.charAt(0); 
  } 
  if(ch=='N'||ch=='n') 
  { 
  System.out.println(); 
  System.out.println("系統(tǒng)返回主菜單！"); 
  this.menu(); 
  } 
  if(ch=='Y'||ch=='y') 
  { 
  for(j=t;j<n-1;j++) 
  { 
   s[j]=s[j+1]; 
  } 
  n--; 
  System.out.println("數(shù)據(jù)成功刪除!"); 
  System.out.println("系統(tǒng)返回主菜單!"); 
  this.menu(); 
  } 
 } 
 } 
 
 public void look()throws IOException 
 { 
 FileReader fr=new FileReader("F://javaFile//student.txt"); 
 int a; 
 while((a=fr.read())!=-1) 
 { 
  System.out.print((char)a); 
 } 
 fr.close(); 
 System.out.println("系統(tǒng)返回主菜單！"); 
 System.out.println(); 
 this.menu(); 
 } 
 
 public void modif()throws IOException 
 { 
 this.judge(); 
 int j=0,t=0,k=0,num2,num3,moi,c=1; 
 char ch; 
 String str,str1,str2; 
 Scanner pin=new Scanner(System.in); 
 System.out.print("請輸入要修改的學號:"); 
 num2=pin.nextInt(); 
 for(j=0;j<n;j++) 
 { 
  if(s[j].num==num2) 
  { 
  k=1; 
  t=j; 
  } 
 } 
 if(k==0) 
 { 
  System.out.println("對不起！你要修改的學號不存在！"); 
  System.out.println("系統(tǒng)將返回主菜單！"); 
  this.menu(); 
 } 
 if(k==1) 
 { 
  System.out.println("你要修改的學生信息如下:");//打印管理員要刪除的學生信息 
  System.out.println("學號\t姓名\t班級");//本功能暫時不備擴展性 
  System.out.println(s[t].num+" "+s[t].name+" "+s[t].classAge); 
  System.out.println(); 
  System.out.print("你確定要修改(Y/N):"); 
  str=pin.next(); 
  ch=str.charAt(0); 
  while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n') 
  { 
  System.out.print("輸入有誤，請重新輸入:"); 
  str=pin.next(); 
  ch=str.charAt(0); 
  } 
  if(ch=='N'||ch=='n') 
  { 
  System.out.println(); 
  System.out.println("系統(tǒng)返回主菜單！"); 
  this.menu(); 
  } 
  while(c==1) 
  { 
  if(ch=='Y'||ch=='y') 
  { 
   System.out.println("****************************************"); 
   System.out.println("*****  1.修改學號  *****"); 
   System.out.println("*****  2.修改班級  *****"); 
   System.out.println("*****  3.修改姓名  *****"); 
   System.out.println("****************************************"); 
   System.out.print("請選擇:"); 
   moi=pin.nextInt(); 
   switch(moi) 
   { 
   case 1:System.out.print("請輸入新的學號:");num3=pin.nextInt();s[t].num=num3;break; 
   case 2:System.out.print("請輸入新的班級:");str1=pin.next();s[t].classAge=str1;break; 
   case 3:System.out.print("請輸入新的姓名:");str2=pin.next();s[t].name=str2;break; 
   } 
   System.out.println("數(shù)據(jù)已成功修改！"); 
  } 
  System.out.print("是否繼續(xù)修改(Y/N)"); 
  str=pin.next(); 
  ch=str.charAt(0); 
  System.out.println(); 
  while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n') 
  { 
   System.out.print("輸入有誤，請重新輸入:"); 
   str=pin.next(); 
   ch=str.charAt(0); 
  } 
  if(ch=='N'||ch=='n') 
  { 
   break; 
  } 
  } 
 } 
 System.out.println(); 
 System.out.println("系統(tǒng)返回主菜單！"); 
 this.menu(); 
 } 
 
 public static void main(String[] args)throws IOException 
 { 
 Student stu=new Student(); 
 for(int i=0;i<2;i++) 
 { 
  s[i]=new Student(); 
 } 
 stu.menu(); 
 } 
}