Help me come up with a for each statement to print their letter grade. this is the code i have so far and then this is the given code from student.java

public class GradeBook $\{$

public static void main$($String$[]$ args$)\{$

final String GRADEDELIMITERS $=","$;

$/*$ TODO: Create a new ArrayList of Student objects called gradebook. $*/$

ArrayList gradebook $=$ new ArrayList$()$;

$/*********$ START PHASE $1$ TODO ITEMS $*********/$

$/*$

$*$ TODO: Create student objects to populate your ArrayList using the following

$*$

$*$ Student $1$

$*$ First Name: Samwise

$*$ Last Name: Gamgee

$*$ Student ID: $1234$

$*$ Grade: $93$

$*$

$*$ Student $2$

$*$ First Name: Frodo

$*$ Last Name: Baggins

$*$ Student ID: $2345$

$*$ Grade: $88$

$*$

$*$ Student $3$

$*$ First Name: Pippin

$*$ Last Name: Took

$*$ Student ID: $3456$

$*$ Grade: $70$

$*$

$*$ Student $4$

$*$ First Name: Meriadoc

$*$ Last Name: Brandybuck

$*$ Student ID: $4567$

$*$ Grade: $70$

$*/$

Student s$1=$ new Student$("$Samwise$",$ "Gamgee", $1234)$;

Student s$2=$ new Student$("$Frodo$",$ "Baggins", $2345)$;

Student s$3=$ new Student$("$Pippin$",$ "Took", $3456)$;

Student s$4=$ new Student$("$Meriadoc$",$ "Brandybuck", $4567)$;

gradebook.add$($s$1)$;

gradebook.add$($s$2)$;

gradebook.add$($s$3)$;

gradebook.add$($s$4)$;

$/*********$ END PHASE $1$ TODO ITEMS $*********/$

Student.java

public class Student $\{$

private String firstName;

private String lastName;

private int id;

private int grade;

$/**$

$*$ Create a new student object

$*$ @param firstName First name of student

$*$ @param lastName Last name of student

$*$ @param id Student's id number

$*/$

public Student$($String firstName, String lastName, int id$)\{$

this.firstName $=$ firstName;

this.lastName $=$ lastName;

this.id $=$ id;

this.grade $=-1$;

$\}$

$/**$

$*$ @return the firstName

$*/$

public String getFirstName$()\{$

return firstName;

$\}$

$/**$

$*$ @param firstName the firstName to set

$*/$

public void setFirstName$($String firstName$)\{$

this.firstName $=$ firstName;

$\}$

$/**$

$*$ @return the lastName

$*/$

public String getLastName$()\{$

return lastName;

$\}$

$/**$

$*$ @param lastName the lastName to set

$*/$

public void setLastName$($String lastName$)\{$

this.lastName $=$ lastName;

$\}$

$/**$

$*$ @return the id

$*/$

public int getId$()\{$

return id;

$\}$

$/**$

$*$ @param id the id to set

$*/$

public void setId$($int id$)\{$

this.id $=$ id;

$\}$

$/**$

$*$ @return the grade

$*/$

public int getGrade$()\{$

return grade;

$\}$

$/**$

$*$ @param grade the grade to set

$*/$

public void setGrade$($int grade$)\{$

this.grade $=$ grade;

$\}$

$/**$

$*$ Get a letter grade that represents the student's current score

$*$ @return String containing the letter grade representing the student's course grade

$*/$

public String getLetterGrade$()\{$

String letterGrade;

if $($this$.$grade $>=90)\{$

letterGrade $="$A$"$;

$\}$ else if $($this$.$grade $>=80)\{$

letterGrade $="$B$"$;

$\}$ else if $($this$.$grade $>=70)\{$

letterGrade $="$C$"$;

$\}$ else if $($this$.$grade $>=60)\{$

letterGrade $="$D$"$;

$\}$ else if $($this$.$grade $>=0)\{$

letterGrade $="$F$"$;

$\}$ else $\{$

letterGrade $="$No grades have been entered for student";

$\}$

return letterGrade;

$\}$

@Override

public String toString$()\{$

String output $=""$;

String letter $=$ this.getLetterGrade$()$;

output $+=$ this.firstName $+""+$ this.lastName $+"$ has $"+(($letter$.$equals$("$A$")||$letter$.$equals$("$F$"))?"$an $"$:$"$a $")+$ letter $+"."$;

return output;

$\}$