本文實(shí)例為大家分享了java學(xué)生信息管理系統(tǒng)的具體代碼,實(shí)現(xiàn)學(xué)生信息: 增加 int[] a=new int[9] 、刪除 、查找、更改,供大家參考,具體內(nèi)容如下
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/*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(méi)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(); } } |
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持服務(wù)器之家。
原文鏈接:http://blog.csdn.net/u010885095/article/details/38848235