java program problem

why is it that my gpa are shown as 0.0 and it's not a value??
below is the code that i include together...please help


import java.io.*;
public class Assignment
{
      public static void main(String[]args)throws IOException
      {
      
      
      try{

      int grade=0;
      float gpa;

      BufferedReader input = new BufferedReader(
            new InputStreamReader(System.in));

      System.out.print("Enter Student Id :");
      String s_id = input.readLine();

      System.out.print("Enter Student Name :");
      String s_name = input.readLine();

      System.out.print("\nEnter Grade for CS211 :");
      String cs211 = input.readLine();

      System.out.print("Enter Grade for CS212 :");
      String cs212 = input.readLine();

      System.out.print("Enter Grade for CS213 :");
      String cs213 = input.readLine();

      System.out.print("Enter Grade for CS214 :");
      String cs214 = input.readLine();

      System.out.print("Enter Grade for CS215 :");
      String cs215 = input.readLine();

      System.out.print("Enter admission test score :");
      String admission = input.readLine();



      if(cs211=="a" || cs211=="A")
      
            grade=4;
      else

            if(cs211=="b" || cs211=="B")
                  grade=3;
            else

                  if(cs211=="c" || cs211=="C")
                        grade=2;
                  else      
      
                        if(cs211=="d" || cs211=="D")
                              grade=1;



      if(cs212=="a" || cs212=="A")
      
            grade=grade+4;
      else

            if(cs212=="b" || cs212=="B")
                  grade=grade+3;
            else

                  if(cs212=="c" || cs212=="C")
                        grade=grade+2;
                  else      
      
                        if(cs212=="d" || cs212=="D")
                              grade=grade+1;



      if(cs213=="a" || cs213=="A")
      
            grade=grade+4;
      else

            if(cs213=="b" || cs213=="B")
                  grade=grade+3;
            else

                  if(cs213=="c" || cs213=="C")
                        grade=grade+2;
                  else      
      
                        if(cs213=="d" || cs213=="D")
                              grade=grade+1;



      if(cs214=="a" || cs214=="A")
      
            grade=grade+4;
      else

            if(cs214=="b" || cs214=="B")
                  grade=grade+3;
            else

                  if(cs214=="c" || cs214=="C")
                        grade=grade+2;
                  else      
      
                        if(cs214=="d" || cs214=="D")
                              grade=grade+1;


      if(cs215=="a" || cs215=="A")
      
            grade=grade+4;
      else

            if(cs215=="b" || cs215=="B")
                  grade=grade+3;
            else

                  if(cs215=="c" || cs215=="C")
                        grade=grade+2;
                  else      
      
                        if(cs215=="d" || cs215=="D")
                              grade=grade+1;
      


      gpa=(float)grade/5;

      
      System.out.println("\n\nStudent Id :" +s_id);
      System.out.println("Student Name :" +s_name);
      System.out.println("\n\nCS211 :"+cs211);
      System.out.println("CS212 :"+cs212);
      System.out.println("CS213 :"+cs213);
      System.out.println("CS214 :"+cs214);
      System.out.println("CS215 :"+cs215);
      System.out.println("GPA :" +gpa+ " and Admission test score: "+admission);

      
      }catch(Exception e){System.out.println("["+e+"]");}
      }
}

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