java的课程表求解

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package reportcard;
import java.util.Scanner;
import java.text.*;
/**

 *

 * @author Administrator

 */
public class Reportcard {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
     String [][]s3=new String [100][3];
     int [][]s4=new int [100][6];
     int i=1;
     String a;
     System.out.println("现在要创建一个成绩单：");
      Scanner input =new Scanner(System .in);// TODO code application logic here
      System.out.print("请输入课程名称：");
      String s =input.next();
      System.out.print("请输入教师名称：");
      String s1 =input.next();
      System.out.print("请输入班级名称：");
      String s2 =input.next();
      System.out.print("请输入学生人数：");
      int n=input.nextInt();
      chengji(s3,s4,n);
      System.out.print("成绩单已创建成功！！\n请输入指令：\n查看成绩单：请输入“1”\n查询成绩：请输入“2”\n退出选择：请输入“0”\n");
      caidan(s3,s4,s,s1,s2,n);
    }
    public static void caidan(String s3[][],int s4[][],String s,String s1,String s2,int n){
        Scanner input =new Scanner(System .in);
        int i=1;
              while(i==1){
        String a =input.nextLine();
          switch(a){
      case"1":{chengjidan(s3,s4,s,s1, s2,n);break;}
       case"2":{chaxunchengji(s3,s4,n);break;}
           case"0":{i=0;break;}
          }
          System.out.print("请输入指令：\n查看成绩单请输入“1”\n查询成绩请输入“2”\n退出选择请输入“0”\n");
      }
    }
    public static void chengji(String s[][],int s2[][],int n){
    Scanner input =new Scanner(System .in);
    for(int i=1;i<=n;i++){
        System.out.print("请输入第"+i+"个学生的学号：");
        s[i][1]=input.nextLine();
        System.out.print("请输入学生姓名：");
        s[i][2]=input.nextLine();
        chengji2(s2,i);
    }
    }
    public static void chengji2(int s2[][],int i){
    Scanner input =new Scanner(System .in);
        System.out.print("请输入学生考勤成绩：");
        s2[i][1]=input.nextInt();
        System.out.print("请输入学生测验成绩：");
        s2[i][2]=input.nextInt();
        System.out.print("请输入学生作业成绩：");
        s2[i][3]=input.nextInt();
        System.out.print("请输入学生期末成绩：");
        s2[i][4]=input.nextInt();
        s2[i][5]=s2[i][4]+s2[i][3]+s2[i][2]+s2[i][1]+s2[i][0];
    }
    public static void chengjidan(String s[][],int s2[][],String a,String b,String c,int n){
        int []x=new int [5];
        DecimalFormat df=new DecimalFormat("#.##");
        double e;
        System.out.println("            期末考试成绩单      ");
        System.out.println("课程 ："+a);
        System.out.println("教师 ："+b);
        System.out.println("班级 ："+c);
        System.out.println("学号       姓名     考勤     小测     作业     期末     总评  ");
        for(int i=1;i<=n;i++){
        System.out.printf("%-11s%-9s%-9s%-9s%-9s%-9s%-9s\n",s[i][1],s[i][2],s2[i][1],s2[i][2],s2[i][3],s2[i][4],s2[i][5]);
    }
        for(int i=0;i<5;i++){
        x[i]=0;
        }
        for(int i=1;i<=n;i++){
            if(s2[i][5]>=90) x[0]++;
            else
                if(s2[i][5]<90&&s2[i][5]>=80) x[1]++;
            else
                    if(s2[i][5]<80&&s2[i][5]>=70) x[2]++;
            else
                        if(s2[i][5]<70&&s2[i][5]>=60) x[3]++;
            else
                            x[4]++;
        }
        System.out.println("成绩区段      人数            百分比");
        e=x[0]*1.0/n;
        String st=df.format(e);
        System.out.printf("90~100         %-15s",x[0]);
        System.out.println(st);
        e=x[1]*1.0/n;
        System.out.printf("80~89          %-15s",x[1]);
        st=df.format(e);
        System.out.println(st);
        e=x[2]*1.0/n;  
        System.out.printf("70~79          %-15s",x[2]);
        st=df.format(e);
        System.out.println(st);
        e=x[3]*1.0/n;
        System.out.printf("60~69          %-15s",x[3]);
        st=df.format(e);
        System.out.println(st);
        e=x[4]*1.0/n;
        System.out.printf("0~60           %-15s",x[4]);
        st=df.format(e);
        System.out.println(st);
    }
    public static void chaxunchengji(String s[][],int s2[][],int n){
        String a;
        int i;
        Scanner input =new Scanner(System .in);
        System.out.print("查询学生的学号：");
        a =input.nextLine();
        for( i=1;i<=n;i++){
            if(a.equals(s[i][1])) {System.out.println("学号       姓名     考勤     小测     作业     期末      总评  ");
            System.out.printf("%-11s%-9s%-9s%-9s%-9s%-9s%-9s\n",s[i][1],s[i][2],s2[i][1],s2[i][2],s2[i][3],s2[i][4],s2[i][5]);
            break;
            }
        }
        if(i>n) System.out.println("没有此人，请确认输入是否正确");
    }
}