這是我用Java編的增加學生信息的代碼，不和數據庫連接，怎樣實現查找和更新功能啊，求大神幫忙！??！小女子感激不盡import java.util.Scanner;public class xinguan{public static void main(String []args){?? Scanner input=new Scanner(System.in);?? /*增加學生信息*/???? for(int i=1;i<3;i++){?System.out.println("第"+i+"個學生");???? System.out.println("請輸入學號");???? int []num=new int[28];???? num[i]=input.nextInt();???? System.out.println("請輸入學生姓名");???? String[] name=new String[28];???? name[i]=input.next();???? System.out.println("請輸入數學成績");???? double[] math=new double[28];???? math[i]=input.nextDouble();???? System.out.println("請輸入語文成績");???? double[]chinese=new double[28];???? chinese[i]=input.nextDouble();???? System.out.println("請輸入英語成績");???? double[] english=new double[28];???? english[i]=input.nextDouble();???? double grades=math[i]+chinese[i]+english[i];???? double avg=grades/3;???? System.out.println("學號"+num[i]+"姓名"+name[i]+"數學成績"+math[i]+"語文成績"+chinese[i]+"英語成績"+english[i]+"總成績"+grades+"平均分"+avg);???? }????? ??????? ? System.out.println("請輸入要查找的學號");??????? ? int num=input.nextInt();??????? ???????? ? ???????? }??? ?? ??? ?? ????? }?/*查找學生信息*/?? ??