Can't make static reference to method while it is static

Hello, can somebody please help me with my problem. I created a jsp page wich includes a .java file I wrote. In this JSP I called a method in the class I created. It worked but when I made the method static and adjusted the calling of the method it started to complain while i didnt make an instance of the class. the error is:Can't make static reference to method
here is the code for the class and jsp:
public class PhoneCheckHelper {
public static String checkPhoneNumber(String phoneNumber) {
String newPhoneNumber ="";
for(int i=0; i<phoneNumber.length(); i++) {
char ch = phoneNumber.charAt(i);
if(Character.isDigit(ch)) {
newPhoneNumber += String.valueOf(ch);
return newPhoneNumber;
<html>
<head>
<title>phonecheck_handler jsp pagina</title>
<%@page import="java.util.*,com.twofoldmedia.text.*, java.lang.*" %>
</head>
<body>
<input type="text" value="<%= PhoneCheckHelper.checkPhoneNumber(request.getParameter("phonenumberfield")) %>">
</body>
</html>

Go over to the "New to Java" forum where that message is frequently explained. Do a search if you don't see it in the first page of posts.

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Can't make static reference to method

hi all,
pls help me in the code i'm getting
" can't make static reference to method....."
kindly help me
the following code gives the error:
import java.rmi.*;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.io.*;
import java.io.IOException;
import java.io.LineNumberReader;
public class client
static String vcno;
static String vpin;
static String vamt;
static String vordid;
static String vptype;
//static String vreq;
static String vreq = "1";
static String vorgid;
static String vm1;
static String vs1;
static String vqty1;
static String vm2;
static String vs2;
static String vqty2;
static String vm3;
static String vs3;
static String vqty3;
static String vm4;
static String vs4;
static String vqty4;
public static void main(String args[])
try
ServerIntf serverintf=(ServerIntf)Naming.lookup("rmi://shafeeq/server");
int c;
StringBuffer sb;
FileReader f1=new FileReader("c:/testin.txt");
sb=new StringBuffer();
int line=0;
while ((c=f1.read())!=-1) {
sb.append((char)c);
LineNumberReader inLines = new LineNumberReader(f1);
String inputline;
String test;
while((inputline=inLines.readLine())!=null)
line=inLines.getLineNumber();
switch(line)
case 1: {
vcno = inLines.readLine();
System.out.println(vcno);
case 2: {
vpin = inLines.readLine();
System.out.println(vpin);
case 3: {
vptype = inLines.readLine();
System.out.println(vptype);
case 4: {
vamt = inLines.readLine();
System.out.println(vamt);
case 5: {
vordid = inLines.readLine();
System.out.println(vordid);
case 6: {
vorgid = inLines.readLine();
System.out.println(vorgid);
     case 7: {
vm1 = inLines.readLine();
System.out.println(vm1);
     case 8: {
vs1 = inLines.readLine();
System.out.println(vs1);
     case 9: {
vqty1 = inLines.readLine();
System.out.println(vqty1);
     case 10: {
vm2 = inLines.readLine();
System.out.println(vm2);
     case 11: {
vs2 = inLines.readLine();
System.out.println(vs2);
case 12: {
vqty2 = inLines.readLine();
System.out.println(vqty2);
case 13: {
vm3 = inLines.readLine();
System.out.println(vm3);
     case 14: {
vs3 = inLines.readLine();
System.out.println(vs3);
case 15: {
vqty3 = inLines.readLine();
System.out.println(vqty3);
case 16: {
vm4 = inLines.readLine();
System.out.println(vm4);
case 17: {
vs4 = inLines.readLine();
System.out.println(vs4);
case 18: {
vqty4 = inLines.readLine();
System.out.println(vqty4);
f1.close();
FileWriter f2=new FileWriter("c:/testout.txt");
String t;
t=ServerIntf.add(vcno,vpin,vamt,vordid,vptype,vreq,vorgid,vm1,vs1,vqty1,vm2,vs2, vqty2,vm3,vs3,vqty3,vm4,vs4,vqty4);
String str1 = " >>";
str1 = t + str1;
f2.write(str1);
System.out.println('\n'+"c:/testout.txt File updated");
f2.close();
catch(Exception e)
System.out.println("Error " +e);

Yes, ServerIntf is the interface type. The instance serverIntf. You declared it somewhere at the top of the routine.
So what you must do is call t=serverIntf.add(...)This is probably just a mistype.

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How do you make a static reference to a method? I've included code.

I'm sorry but this is a cross post. This should be here but it is also in the 100% pure Java forum. It won't happen again.
Now...
Why doesn't this work? How do I use the method add(int a, int b)?
ERROR - "Can't make static reference to method int add(int, int) in testClass"
interface testInterface{
    static String sString = "TESTING";
    public int add(int a, int b);
class testClass implements testInterface{
    public int add(int a, int b){
        return a+b;
    public static void main(String argv[]){
        int sum = add(3,4);    // here's the error
        System.out.println("test");
        System.out.println( sum );
}Again, I apologize for the cross post.

hi,
this seems to be pretty easy, isn't it?
Oh c'mon! You try to invoke a non-static method from within a static method. Solution: Create a specific instance of class testClass:
testClass test=new testClass();
test.add(3,4);best regards, Michael

How do I make a static reference to a method? Sample Code Included

Why doesn't this work? How do I use the method add(int a, int b)?
ERROR - "Can't make static reference to method int add(int, int) in testClass"
interface testInterface{
    static String sString = "TESTING";
    int add(int a, int b);
class testClass implements testInterface{
    public int add(int a, int b){
        return a+b;
    public static void main(String argv[]){
        int sum = add(3,4);    // here's the error
        System.out.println("test");
        System.out.println( sum );
}

Why doesn't this work?Because you can't call a non-static method like add (which operates on the object called this) from a static method like main (for which there is no this).
There are two ways to fix this:
(1) In main, create a TestClass object, and call add() for that object:
class TestClass implements TestInterface {
   public int add(int a, int b) {
      return a+b;
   public static void main(String[] args) {
      TestClass testObject = new TestClass();
      int sum = testObject.add(3, 4);
      System.out.println("test");
      System.out.println(sum);
}(2) Make add() static. This is the preferred approach, because add() doesn't really need a TestClass object.
class TestClass implements TestInterface {
   public static int add(int a, int b) {
      return a+b;
   // main is same as the original
}

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Hi folks,
I have the following lines of code at the beginning of a non-static method ;
public void streamOutput(Object objectToStream, boolean autoFlush)
Class objectClass = objectToStream.getClass();
Field[] fieldArray = Class.getDeclaredFields();
When using javac to compile this code I get the following error ;
Can't make static reference to method java.la
ng.reflect.Field getDeclaredFields()[] in class java.lang.Class.
Field[] fieldArray = Class.getDeclaredFields();
^
The thing is that I can't see how javac thinks that the method is being called within a static context. The method is non-static, the containing class in non-static, and I even have a reference to 'this' later on inside the method which the compiler accepts ( which it surely wouldn't if I was working within a static context ).
Any ideas what is wrong ?

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STATIC REFERENCE

THE CODE IS ATTACHED. I NEED TO SOLVE THE ERROS.
THIS IS THE ERRORS AFTER COMPILE
C:\My Documents\Java\Assignment\Assign3\PwdClient.java:47: Can't make static reference to method void setLayout(java.awt.LayoutManager) in class java.awt.Container.
                    setLayout(new FlowLayout());
                    ^
C:\My Documents\Java\Assignment\Assign3\PwdClient.java:48: Can't make static reference to method void setBackground(java.awt.Color) in class java.awt.Component.
                    setBackground(Color.green);
                    ^
C:\My Documents\Java\Assignment\Assign3\PwdClient.java:53: Can't make static reference to method java.awt.Component add(java.awt.Component) in class java.awt.Container.
                    add(l);
                    ^
C:\My Documents\Java\Assignment\Assign3\PwdClient.java:58: Can't make static reference to method java.awt.Component add(java.awt.Component) in class java.awt.Container.
                    add(name);
                    ^
C:\My Documents\Java\Assignment\Assign3\PwdClient.java:61: Can't make a static reference to nonstatic variable tf_name in class PwdClient.
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5 errors
//HERE IS THE CODE
import java.io.*;
import java.net.*;
import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
class PwdClient extends Frame
     private TextField tf_name;
     private TextField tf_password;
     private String input_str_name;
     private String input_str_password;
     private String str_to_pass;
     //private String str;
     //private String str_name;
     //private String str_password;
     //private Button button1;
     private final static int buffsize = 512;
     public static void main(String args[])
          try
                    String server = args[0];
                    int port = Integer.parseInt(args[1]);
                    //create socket
                    Socket s = new Socket(server, port);
                    //readresult from server
                    InputStream is = s.getInputStream();
                    DataInputStream dis = new DataInputStream(is);
                    OutputStream os = s.getOutputStream();
                    DataOutputStream dos = new DataOutputStream(os);
                    InputStreamReader isr = new InputStreamReader(System.in);
                    BufferedReader br = new BufferedReader(isr);
                    //Frame frm = new Frame( "Client Server" );
                    setLayout(new FlowLayout());
                    setBackground(Color.green);
                    String str = "Enter Name and Password:";
                    Label l= new Label( str, Label.CENTER);
                    l.setBackground(Color.red);
                    add(l);
                    String str_name = "Name:";
                    Label name = new Label( str_name, Label.CENTER);
                    name.setBackground(Color.red);
                    add(name);
                    //Name textfield User input for name
                    tf_name = new TextField(20);
                    add(tf_name);
                    String str_password = "Password:";
                    Label password = new Label( str_password, Label.CENTER);
                    password.setBackground(Color.red);
                    add(password);
                    //Password Textfield (user input for password)
                    tf_password = new TextField(20);
                    tf_password.setEchoChar('*');
                    add(tf_password);
                    Button Button1 = new Button("Submit");
                    add(Button1);
                    Button1.addActionListener( new ActionListener()
                         public void actionPerformed(ActionEvent ae)
                              input_str_name = tf_name.getText();
                              tf_name.setText(new String(""));
                              input_str_password = tf_password.getText();
                              tf_password.setText(new String(""));
                              str_to_pass = input_str_name+"/"+input_str_password;
                              dos.writeBytes(str_to_pass);
                              String received_from_server = brr.readLine();
                              l.setText(received_from_server, Label.CENTER);
                    frm.setSize( 300, 200 );
                    frm.show();
                    frm.addWindowListener( new WindowAdapter()
                         public void windowClosing(WindowEvent e)
                         { System.exit(0);}
          }//closes the try
          catch(Exception e){}

Put the code you have in static main in a constructor, or make an instance of PwdClient in main that you can call those methods on. You can't call non-static methods directly from a static method (main). You need to instantiate the class.
public class PwdClient extends JFrame {
public PwdClient() {
    // the code from your main method
public static void main(String[] args) {
    new PwdClient(); // makes a new instance of PwdClient
}

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Error: Cannot make a static reference to the non-static method

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Cannot make a static reference to the non-static method but If I add the keyword static in front of my method1 and method2 then I would be freely call the methods with no error!
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public class Lab1 {
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}

See the Search Forums at the left of the screen?
If you had searched with "Cannot make a static reference to the non-static method"
http://search.sun.com/search/onesearch/index.jsp?qt=Cannot+make+a+static+reference+to+the+non-static+method+&rfsubcat=siteforumid%3Ajava54&col=developer-forums
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Can't make static reference to method while it is static

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