/*學(xué)生信息管理系統(tǒng)，實(shí)現(xiàn)學(xué)生信息： 
 *增加 int[] a=new int[9] 
 *刪除 
 *查找 
 *更改 
 */ 
import java.util.Scanner;//導(dǎo)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(xué)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(qǐng)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(yǔ)句變量 
  Scanner in=new Scanner(System.in);//實(shí)例化輸入流對(duì)象 
  System.out.println("*********學(xué)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(qǐng)選擇(0~5):"); 
  a=in.nextInt(); 
  while(a<0||a>5) 
  { 
   System.out.print("輸入超出范圍，請(qǐng)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(xué)生信息列表\r\n\r\n學(xué)號(hào)  姓名  班級(jí)\r\n"); 
  Scanner In=new Scanner(System.in); 
  while(t==1) 
  { 
   System.out.print("請(qǐng)輸入學(xué)生學(xué)號(hào):"); 
   num1=In.nextInt(); 
   for(i=0;i<n;i++) 
   { 
    while(s[i].num==num1) 
    { 
     System.out.println("已存在此學(xué)號(hào)，請(qǐng)重新輸入"); 
     System.out.print("請(qǐng)輸入學(xué)號(hào):"); 
     num1=In.nextInt(); 
    } 
   } 
   s[n].num=num1; 
   str2=String.valueOf(num1); 
   fw.write(str2+" "); 
   System.out.println(); 
   System.out.print("請(qǐng)輸入學(xué)生姓名:"); 
   s[n].name=In.next(); 
   fw.write(s[n].name+"  "); 
   System.out.println(); 
   System.out.print("請(qǐng)輸入學(xué)生班級(jí):"); 
   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(qǐng)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(qǐng)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(xué)生!"); 
  System.out.println("你錄入的學(xué)生信息如下:"); 
  System.out.println(); 
  System.out.println("學(xué)號(hào)\t\t姓名\t班級(jí)"); 
  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(shí)現(xiàn) 注：本功能暫時(shí)不具備可擴(kuò)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(qǐng)輸入要?jiǎng)h除的學(xué)號(hào):"); 
  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(duì)不起！你要?jiǎng)h除的學(xué)號(hào)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?jiǎng)h除的學(xué)生信息如下:");//打印管理員要?jiǎng)h除的學(xué)生信息 
   System.out.println("學(xué)號(hào)\t姓名\t班級(jí)");//本功能暫時(shí)不備擴(kuò)展性 
   System.out.println(s[t].num+"  "+s[t].name+"  "+s[t].classAge); 
   System.out.println(); 
   System.out.print("你確定要?jiǎng)h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(qǐng)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(qǐng)輸入要修改的學(xué)號(hào):"); 
  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(duì)不起！你要修改的學(xué)號(hào)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(xué)生信息如下:");//打印管理員要?jiǎng)h除的學(xué)生信息 
   System.out.println("學(xué)號(hào)\t姓名\t班級(jí)");//本功能暫時(shí)不備擴(kuò)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(qǐng)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(xué)號(hào)   *****"); 
     System.out.println("*****   2.修改班級(jí)   *****"); 
     System.out.println("*****   3.修改姓名   *****"); 
     System.out.println("****************************************"); 
     System.out.print("請(qǐng)選擇:"); 
     moi=pin.nextInt(); 
     switch(moi) 
     { 
      case 1:System.out.print("請(qǐng)輸入新的學(xué)號(hào):");num3=pin.nextInt();s[t].num=num3;break; 
      case 2:System.out.print("請(qǐng)輸入新的班級(jí):");str1=pin.next();s[t].classAge=str1;break; 
      case 3:System.out.print("請(qǐng)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(qǐng)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(); 
 } 
}