java compilation error

package punitha;
import java.util.Vector;
import javax.swing.*;
import javax.swing.JFrame.*;
import javax.swing.JTextField.*;
import javax.swing.JButton.*;
import javax.swing.JFileChooser.*;
import javax.swing.JOptionPane.*;
import javax.swing.JTextArea.*;
import java.awt.event.*;
//import java.awt.event.ActionListener;
import java.io.File;

//import javax.swing.filechooser.*;
public class Input extends javax.swing.JFrame {
JFileChooser fc = new JFileChooser();
File file;
int noOfClusters;
Vector dataPoints=null;
JTextField tenterNoOfEle=null;
// JTextArea ta=null;

/** Creates new form Input */
public Input() {
super("CLustering algorithms");
initComponents();

}



private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
ReadFile rf=new ReadFile(file.getAbsolutePath());
System.out.println("file is ::"+file.getAbsolutePath());
dataPoints=rf.getDataPoints();
String firstNumber=JOptionPane.showInputDialog("enter the number of clusters");
int noOfClusters=Integer.parseInt(firstNumber);
System.out.println("clusters"+noOfClusters);
// noOfClusters=Integer.parseInt(tenterNoOfEle.getText());
System.out.println("clusters"+dataPoints.size());
KMeans kmeans=new KMeans(noOfClusters,dataPoints);
kmeans.startAnalysis();
Output op1=new Output(kmeans);
}



public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Input().setVisible(true);
}
});
}

i have created the input.java file GUI design. i have given that as a package.
now in jButton4ActionPerformed method i am calling other java pgms like k-means and Readfile...
when i execute am getting error

C:\Punitha\src\punitha\Input.java:278: cannot find symbol
symbol : class ReadFile
location: class punitha.Input
ReadFile rf=new ReadFile(file.getAbsolutePath());
C:\Punitha\src\punitha\Input.java:278: cannot find symbol
symbol : class ReadFile
location: class punitha.Input
ReadFile rf=new ReadFile(file.getAbsolutePath());
C:\Punitha\src\punitha\Input.java:286: cannot find symbol
symbol : class KMeans
location: class punitha.Input
KMeans kmeans=new KMeans(noOfClusters,dataPoints);
C:\Punitha\src\punitha\Input.java:286: cannot find symbol
symbol : class KMeans
location: class punitha.Input
KMeans kmeans=new KMeans(noOfClusters,dataPoints);
C:\Punitha\src\punitha\Input.java:288: cannot find symbol
symbol : class Output
location: class punitha.Input
Output op1=new Output(kmeans);
C:\Punitha\src\punitha\Input.java:288: cannot find symbol
symbol : class Output
location: class punitha.Input
Output op1=new Output(kmeans);
6 errors
BUILD FAILED (total time: 3 seconds)