A simple student management system written in Java [improved]

A simple student management system written in Java

import java.util.*;p Ublic class student_cj { public static void main ( String[] args) {    scanner in=new scanner (system.in);   System.out.print ("Please enter the number of students:");   int num=in.nextint ();//number of students   string[] str=new  string[num];//combined with one row of data   system.out.print ("Please enter the number of accounts:");   int kms=in.nextint ();//Number of accounts   string[] name=new string[num];//Student Name     int arr[][]=new  int[num][kms];//Store student Results   string[] kmmc= new string[kms];//subject name   int[]  sum=new int[num];//for Total   system.out.println ("Please set account name")   for (int i=0;i< kmmc.length;i++) {   system.out.print ("+ (i+1) +" subjects: ");    kmmc[i]=in.next ();   }    for (int i=0;i<num;i++) {   string cj= "";    system.out.print ("Please enter section" + (i+1) + "Student Name:");    name[i]=in.next ();       for (int j=0;j<kms ; j + +) {    system.out.print ("Please enter" +name[i]+ "" +kmmc[j]+ "Score:");     arr[i] [J]=in.nextint ();     cj+= "\ t" +arr[i][j];    sum[i]+=arr[i][j];    }   str[i]=name[i]+cj+ "\ t" +sum[i]+ "\ T" + (SUM[I]/KMS);  }    System.out.print ("name");   for (int i=0;i<kms;i++) {   system.out.print ("\ t" +kmmc [i]);   }  system.out.print ("\ T" + "total score" + "\ T" + "average");   for (int i=0;i<num;i++) {    system.out.println ();    system.out.print (Str[i]);  }   System.out.println ("\ n");   //the following to rank the score   system.out.print ("\t\t★★★ ranked the results ★");   System.out.println ();   system.out.print ("name");   for (int i=0;i<kms;i++) {    systeM.out.print ("\ T" +kmmc[i]),   }  system.out.print ("\ T" + "total score" + "\ T" + "average" + "\ T" + "leaderboard");   for (int i=0;i<num-1;i++) {   string tmp= "";    for (int j=0 ; j<num-1;j++) {    if (sum[i]<sum[i+1]) {     tmp=str[i];      str[i]=str[i+1];     str[i+1]=tmp;     }   }  }  system.out.println ();   for (int i=0;i<num; i++) {   system.out.print (str[i]+ "\ T" + "first" + (i+1) + "name");    system.out.println ();   } }}

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