unexpected type error in java

[SpeedRunner]

I've tried everything I could but I can't get line 128 to work for ANYTHING.

C:\Documents and Settings\Marshall\My Documents\My Downloads\RosterTest.java:128: unexpected type
required: variable
found   : value
				 prev.setNext(cur) = cur.getNext();
                                             ^
1 error

Tool completed with exit code 1

import javax.swing.*;
public class RosterTest
{

   public static void main(String[] args)
   {
      String input;
      Roster myRoster = new Roster();
      do
      {
         input = menu();
         if(input == null || input.equalsIgnoreCase("q"))
         {
            JOptionPane.showMessageDialog(null,"Goodbye!");
         }
         else if(input.equalsIgnoreCase("a"))
         {
            doAdd(myRoster);
         }
         else if(input.equalsIgnoreCase("f"))
         {
            doFind(myRoster);
         }
         else if(input.equalsIgnoreCase("r"))
         {
            doRemove(myRoster);
         }
         else if(input.equalsIgnoreCase("l"))
         {
            JOptionPane.showMessageDialog(null,myRoster);
         }
         else
         {
            JOptionPane.showMessageDialog(null,"Invalid - try again!");
         }
      }while(input != null && !input.equalsIgnoreCase("q"));
      System.exit(0);
   }

   public static String menu()
   {
      String s = "MENU\na - add\nf - find\nr - remove"
         + "\nl - list\nq - quit\nEnter a letter:";
      return JOptionPane.showInputDialog(s);
   }

   public static void doAdd(Roster myRoster)
   {
      String name = JOptionPane.showInputDialog(
            "Enter student name:");
      int number = Integer.parseInt(JOptionPane
         .showInputDialog("Enter student number:"));
      double gpa = Double.parseDouble(JOptionPane
         .showInputDialog("Enter student gpa:"));
      boolean added = myRoster.add(new Student(name,number,gpa));
      if(!added)
      {
         JOptionPane.showMessageDialog(null,"Student with number " +
            number + " already exists!");
      }
   }

   public static void doFind(Roster myRoster)
   {
      int number = Integer.parseInt(JOptionPane
         .showInputDialog("Enter student number:"));
      Student foundStu = myRoster.find(number);
      if(foundStu == null)
      {
         JOptionPane.showMessageDialog(null,"No student with number "
            + number + "!");
      }
      else
      {
         JOptionPane.showMessageDialog(null,foundStu);
      }
   }

   public static void doRemove(Roster myRoster)
   {
      int number = Integer.parseInt(JOptionPane
         .showInputDialog("Enter student number:"));
      Student removedStu = myRoster.remove(number);
      if(removedStu == null)
      {
         JOptionPane.showMessageDialog(null,"No student with number "
            + number);
      }
      else
      {
         JOptionPane.showMessageDialog(null,"Removed student: " + removedStu);
      }
   }
}

class Roster
{
	 private Student head;

	 public Roster()
	 {

	 }
	 public Student find(int toFind)
	 {


		 Student cur = head;
		 while(cur != null)
		 {
			 if(toFind == cur.getNumber())
			 {
				 return cur;
			 }
			 cur = cur.getNext();
		 }
		 return null;
	 }
	 public Student remove(int toKill)
	 {

		 Student prev = null;
		 Student cur = head;
		 while(cur != null)
		 {
			 if(cur.getNumber() == toKill)
			 {
				 prev.setNext(cur) = cur.getNext();
			 }
			 prev = cur;
			 cur.getNext();
		 }
		 return null;
	 }
    public boolean add(Student addStu)
    {

		 Student prev = null;
		 Student cur = head;
		 while(cur != null && addStu.getNumber() < cur.getNumber())
		 {
			 prev = cur;
			 cur.getNext();
		 }
		 addStu = cur;
		 prev = addStu;
		 return false;
	 }
	 public String toString()
	 {
		 return null;
	 }
}

class Student
{
    private String name;
    private int number;
    private double gpa;

    private Student next;

	 public Student(String nam, int num, double g)
	 {
		 name = nam;
		 number = num;
		 gpa = g;
	 }
    public Student getNext()
    {
        return next;
    }
    public int getNumber()
    {
		  return number;
	 }
    public void setNext(Student n)
    {
        next = n;
    }
    public String toString()
    {
        return(name + number + gpa);
    }
}

I'm well aware that the variable needs to be sent with the method call... I just cannot figure out a good variable to put in there. The only thing that makes sense is a value, not a variable! I cannot edit anything above the Roster class, by the way.

 

[SpeedRunner]

I'll post just the method to make it alittle bit easier to see.

	 public Student remove(int toKill)
	 {

		 Student prev = null;
		 Student cur = head;
		 while(cur != null)
		 {
			 if(cur.getNumber() == toKill)
			 {
				 prev.setNext(cur) = cur.getNext();
			 }
			 prev = cur;
			 cur.getNext();
		 }
		 return null;
	 }

 

[generelz]

Your LValue (the value on the left of the assignment) is a function call. You can't do that - it must be a variable. Perhaps you mean to do something like setNext(cur.getNext()), or perhaps overload setNext to take two variables: the object that the value should be inserted after and the value to be inserted, i.e. setNext(cur, cur.getNext())?

 

[SpeedRunner]

Thanks, I had just figured that out a few minutes before you posted it.