java - I need of assistance with array assigning user inputs to an array, and do-while loop repeat -

i'm having few problems code, on goal of program.

one of professors hears of emerging programming expertise , asks write single program can used them grading. professor gives 3 50-point exams , single 100-point final exam. program prompt user student’s name, entered firstname lastname (i.e. bob smith), student’s 3-exam scores , 1-final exam score (all whole numbers). class size varies semester semester, 100 limit (declare constant).

read in information students before doing calculations or displaying output. verify 3 exam scores between 0-50 points , final between 0-100 entered. declared minimums , maximums constant can updated, needed. if invalid, display error message , allow user re-enter invalid score. once student info read in, display each student’s name in format lastname, firstname (all uppercase), student’s exam percentage (total of exams plus final / total possible) 1 decimal , student’s final grade.

this have:

import java.util.*; import java.text.*;   public class proj4 { public static void main(string[] args){ scanner s= new scanner(system.in); string input; string again = "y"; final int max_students = 100; final int min_exam = 0; final int max_exam = 50; final int min_final = 0; final int max_final = 100;  string[] names = new string[max_students]; int [] exams = new int[max_students * 4]; int student = 1;  {         system.out.print("please enter name of student " + student + ": " );         (int k = 0; k < 1; k++) {             names[k] = s.nextline().touppercase();         }         ( int = 0; < 4; i++){             if(i==3){                 system.out.print("please enter score final exam: ");                 exams[i] = s.nextint();             }             else{             system.out.print("please enter score exam " + (i+1) + ": ");             exams[i] = s.nextint();                   if((exams[0]<min_exam||exams[0]>max_exam)||(exams[1]<min_exam||exams[1]>max_exam)||(exams[2]<min_exam||exams[2]>max_exam)){                     system.out.println("invalid enter 0-50 only...");                     system.out.print("please re-enter score: ");                     exams[i] = s.nextint();                 }                 else if(exams[3]<min_final||exams[3]>max_final){                     system.out.println("invalid enter 0-100 only...");                     system.out.print("please re-enter score: ");                     exams[i] = s.nextint();                 }             }         }         system.out.print("do wish enter another? (y or n) ");         again = s.next();         if(again!="y")             student++; }while (again.equalsignorecase ("y"));  system.out.println("***class results***"); system.out.println(names[1] + "," + names[0] + "   " + "exam percentage: "+ ((exams[0]+exams[1]+exams[2]+exams[3])/(max_exam*3+max_final)));  } } 

the problems have have are:

• figuring out how assign user entered test scores beyond first student, believe have set correct one, runs problem when move on second student.

• for reason cannot figure out line

  system.out.print("do wish enter another? (y or n) "); again = s.next(); 

  doesn't allow me enter anything, not y not n not anything, program ends there, doesn't make sense me because i've done before , has worked.

• other that, if there other problems can see code pointing them out extremely helpful.

thank you

edit-

new problem having, after changing

if(!again.equalsignorecase("y"))             student++; }while (again.equalsignorecase ("y")); 

it lets me type things in now, after type in y prints next line as

please enter name of student 1: please enter score exam 1:

i don't know why or need change fix it, suggestions?

`if(again!="y")` culprit here  

you should use equals() method check string equality.

if(!again.equals("y"))