Incompatible types error....plzz help

the code is
import java.util.*;
class a{
public static void main(String args[]){
LinkedList list = new LinkedList ( ) ;
list.add ( "shiva" ) ;
list.add ( "java" ) ;
list.add ( "world" ) ;
String [ ] str = list.toArray ( new String [ list.size ( ) ] ) ;
}}the error is
C:\Documents and Settings\Sumit\Desktop>javac a.java
a.java:11: incompatible types
found : java.lang.Object[]
required: java.lang.String[]
String [ ] str = list.toArray ( new String [ list.size ( ) ] ) ;
^
Note: a.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
i am not getting what's wrong with it

i am not getting what's wrong with itYou're not going to like this advice, but still you must learn to help yourself. If you've not done so, please look at the API on the LinkedList toArray method. If it doesn't make sense to you, then ask specific questions about what in the API you don't understand.

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import java.io.*; // needed for stream readers
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thank you. here's the code.
import java.io.*;       // needed for stream readers
import java.lang.*;
public class testScores extends Object
     public static void main(String args[] ) throws Exception
     // declare variables for input
        String      records;
        String      room_nbr_input;
        String      test_score_input;
        String      student_id;
        int             room_nbr_nbr;
        int             test_score_nbr;
        int          index;
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        int[]      room_nbr = new int[30];
        int[]       test_score = new int[30];
        int[]      kount = new int[30];
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          BufferedReader brM;
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          brM = new BufferedReader(frM);
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          while(records !=null)
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          record = records.split(", ");
          student_id = record[0];
          room_nbr_input = record[1];
          test_score_input = record[2];
          //change the data into integers
          room_nbr_nbr = Integer.parseInt(room_nbr_input);
          test_score_nbr = Integer.parseInt(test_score_input);
          //put the variables into arrays
          room_nbr[room_nbr_nbr -1] = room_nbr_nbr;
          test_score[room_nbr_nbr -1] = test_score[room_nbr_nbr -1] + test_score_nbr;
          //get new record
          records = brM.readLine();
           for (index = 0; index = room_nbr.length; index++)
                System.out.print(room_nbr[index] + "\t\t" + test_score[index]);
     public static void startUp()
     System.out.print("Einstein Elementary Test Scores\n\n");
     System.out.print("Room Number\t\tTest Score Average\n\n");
}          // end of class declaration

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found : double
required: javax.swing.JTextField
TotalIncomeField = (num1 + num2 + num3);
try {
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double num2 = Double.parseDouble(WagesField.getText());
double num3 = Double.parseDouble(OtherField.getText());
double num4 = Double.parseDouble(RentField.getText());
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if
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SIGH SIGH SIGH
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http://forum.java.sun.com/thread.jspa?threadID=780703

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The line JDev is complaining about contains the following code :
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Help on Incompatible types

Sample 1:
public interface I<T extends I<?>>
I<? extends I<T>> m1 ();
public class Z<T extends I<?>> implements I<T>
public I<? extends I<T>> m1 ()
    return m2();
protected I<? extends I<T>> m2 ()
    return null;
javac Z.javacompiled with no problems
Sample 2:
public interface I<Tx, T extends I<Tx, ?>>
I<Tx, ? extends I<Tx, T>> m1 ();
public class Z<Tx, T extends I<Tx, ?>> implements I<Tx, T>
public I<Tx, ? extends I<Tx, T>> m1 ()
    return m2();
protected I<Tx, ? extends I<Tx, T>> m2 ()
    return null;
javac Z.javaZ.java:5: incompatible types
found : I<Tx,capture of ? extends I<Tx,T>>
required: I<Tx,? extends I<Tx,T>>
return m2();
^
1 error
Well... can anyone help with this? Or at least some explanations why adding second generic generates this problem?

The problem is in the recursion, not in the second type argument. If you changed your first interface from
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    public class Z<E>
      public I<? extends I<E>> m1 ()
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        /* error: incompatible types
           found   : I<capture of ? extends I<E>>
           required: I<? extends I<E>>
           return m2();
                    ^
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Method m2 returns a reference of type I<capture of ? extends I<E>>, where E extends I<capture of ? extends I<E>>, that is, it returns a concrete instantiation of the interface, namely I<SomeType> with a type that extends I<SomeType> with a type that extends ... continued recursively.
On the other hand, method m1 is supposed to return a reference of type I<? extends I<E>>, where E extends I<? extends I<E>>, that is, it returns a wildcard instantiation of the interface, namely I<? extends I<SomeType>> with a type that extends I<? extends I<SomeType>> with a type that extends ... continued recursively.
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In your example, changing
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I'm trying to run a Text input program out of the Eclipse program and I keep getting this Editor does not contain a main type error - can someone help me
here's the code
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import java.io.FileNotFoundException;
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import uwcse.io.Input;
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Your program runs fine, so the error is an Eclipse error unrelated to Java.
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In parser file "Parser.fx",
public-read def PROPERTIES_PARSER = StreamParser {
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Parser.fx
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import javafx.data.pull.PullParser;
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            fields: topLevel as java.util.Map
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           records: [mr]

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