STATIC REFERENCE

Question

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.
                    tf_name = new TextField(20);
                    ^
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){}

Answer 1

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
}