.class error in java program

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Java

programming

errors

Hi! This program is supposed to write to a file, then read it. It's reading randomized coordinates generated by the program.
Whenever I compile the program it gives me the error of:

File: F:\COMPSCI 12\J4.java  [line: 54]
Error: F:\COMPSCI 12\J4.java:54: '.class' expected

I'm not sure what the error means. How can I fix this? Thanks!

CODE:

import java.io.*;
import java.util.Arrays;

public class J4
{
  public static void main (String [] args) throws IOException
  {
    int numpoints = 100, dimension = 2, length = 100;//numpoints is set to 100, dimension is set to 2, length is set to 100
    
    //arrays are initializewd and declared
    double [] lengthscale = new double [dimension];
    double [][] locations = new double [numpoints][dimension];
    
    PrintWriter fileOut = new PrintWriter (new FileWriter ("arrayNumPoints.txt"));
    
    writefile(lengthscale, locations, dimension, numpoints, length);
    
    
    for(int m=0; m <length; m++){//for loop
      fileOut.println(Arrays.toString(locations[m]) + ", ");//writes to file
    }
    fileOut.close ();//close file
    
    readfile();
  }//end main
  
  public static Double writefile(double lengthscale[], double locations[][], int dimension, int numpoints, int length)throws IOException
  {
    
    for (int a = 0; a < dimension; a++) {// for loop runs while a is less than dimension
      lengthscale[a] = length;// stores array
    }// end for loop
    
    for (int x=0; x < numpoints; x++){//for loop runs while x is less than numpoints
      for (int y=0; y < dimension; y++){//nested for loop runs while y is less than dimension
        locations [x][y]= (2 * Math.random() - 1) * lengthscale[y];//creates the range and choses random point within 
        
      }//end nested for loop
    }//end for loop
    //return locations[x][y];
    //if program doesnt run through loop.. alternative return statement (but
    double b= 1;    
    return b;
  }//end writefile methos
  
  public static int readfile()
  {
    BufferedReader readFile = new BufferedReader (new FileReader ("arrayNumPoints.txt"));
    
    int readarray [] = new int [100];
    for (int counter=0; counter < 100; counter++){
      readarray[counter] = Integer.parseInt (readFile.readLine ());
    }
    return readarray [];
  
}//end readfile method
}//end class