need help in rmi program

Question

Jessurider -10 Posting Whiz in Training

13 Years Ago

can anyone tell me what's the error in this rmi calculator program....... especially the clint.java.........

here when i run the rmi calculator.........i gets an applet calculator.....but for all the mathematical addition,sub,div,mul......i'm getting the null value.......i also doubt at whether the try catch is placed wrongly............

java

calfun.java (0.42 KB)

import java.rmi.*;
import java.rmi.server.*;
public class calfun extends UnicastRemoteObject implements calintf
	{
	calfun()throws RemoteException
		{}
	public int radt(int a,int b)
		{
		int f=a+b;
		return f;
		}
	public int rmul(int a,int b)
		{
		int f=a*b;
		return f;
		}
	public int rsub(int a,int b)
		{
		int f=a-b;
		return f;
		}
	public int rdiv(int a,int b)
		{
		int f=a/b;
		return f;
		}
	}

calintf.java (0.29 KB)

import java.rmi.*;

public interface calintf extends Remote
	{	
	public int radt(int a,int b) throws RemoteException;
	public int rsub(int a,int b) throws RemoteException;
	public int rmul(int a,int b) throws RemoteException;
	public int rdiv(int a,int b) throws RemoteException;	
		
	}

calserver.java (0.19 KB)

import java.rmi.*;
public class calserver
	{
	public static void main(String args[])
		{	try{
		calfun cf=new calfun();
		Naming.rebind("calc",cf);
			}catch(Exception e)
			{}
		}
	}

clint.java (3.53 KB)

import java.applet.*;
import java.awt.event.*;
import java.awt.*;
import java.rmi.*;
//<applet code=clint.class width=200 height=200></applet>
public class clint extends Applet implements ActionListener
{
 Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,ad,sb,ml,dv,eq,clr;
 int x=0,y=0,z=0,s=0,ans;
 String s1;
 TextField t1;
 calintf ci;

 public void init()
 {

  s1="";
  t1=new TextField(20);
  add(t1);

  clr=new Button("Clr");
  clr.addActionListener(this);
  add(clr);

  b1=new Button("1");
  b1.addActionListener(this);
  add(b1);
  
  b2=new Button("2");
  add(b2);
  b2.addActionListener(this);

  b3=new Button("3");
  add(b3);
  b3.addActionListener(this);

  b4=new Button("4");
  add(b4);
  b4.addActionListener(this);

  b5=new Button("5");
  add(b5);
  b5.addActionListener(this);

  b6=new Button("6");
  add(b6);
  b6.addActionListener(this);

  b7=new Button("7");
  add(b7);
  b7.addActionListener(this);

  b8=new Button("8");
  add(b8);
  b8.addActionListener(this);

  b9=new Button("9");
  add(b9);
  b9.addActionListener(this);

  b0=new Button("0");
  add(b0);
  b0.addActionListener(this);

  sb=new Button("-");
  add(sb);
  sb.addActionListener(this);

  ad=new Button("+");
  add(ad);
  ad.addActionListener(this);

  ml=new Button("*");
  add(ml);
  ml.addActionListener(this);

  dv=new Button("/");
  add(dv);
  dv.addActionListener(this);

  eq=new Button("=");
  add(eq);
  eq.addActionListener(this);

 }

 public void actionPerformed(ActionEvent e)
 {
//try{
 
 //}catch(Exception ex){}

  if(e.getSource()==b0)
  {
    s1=s1+0;
    t1.setText(s1);
  }

if(e.getSource()==b1)
  {
    s1=s1+1;
    t1.setText(s1);
  }

if(e.getSource()==b2)
  {
    s1=s1+2;
    t1.setText(s1);
  }

if(e.getSource()==b3)
  {
    s1=s1+3;
    t1.setText(s1);
  }

if(e.getSource()==b4)
  {
    s1=s1+4;
    t1.setText(s1);
  }

if(e.getSource()==b5)
  {
    s1=s1+5;
    t1.setText(s1);
  }

if(e.getSource()==b6)
  {
    s1=s1+6;
    t1.setText(s1);
  }

if(e.getSource()==b7)
  {
    s1=s1+7;
    t1.setText(s1);
  }

if(e.getSource()==b8)
  {
    s1=s1+8;
    t1.setText(s1);
  }

if(e.getSource()==b9)
  {
    s1=s1+9;
    t1.setText(s1);
  }

if(e.getSource()==ad)
  {
    x=1;
    y=Integer.parseInt(t1.getText());
    s1="";
    t1.setText(s1);
  }

if(e.getSource()==sb)
  {
    x=2;
    y=Integer.parseInt(t1.getText());
    s1="";
    t1.setText(s1);
  }

if(e.getSource()==ml)
  {
    x=3;
    y=Integer.parseInt(t1.getText());
    s1="";
    t1.setText(s1);
  }

if(e.getSource()==dv)
  {
    x=4;
    y=Integer.parseInt(t1.getText());
    s1="";
    t1.setText(s1);
  }



if(e.getSource()==clr)
  {
    x=0;
    y=0;
    s1="";
    t1.setText(s1);
  }


if(e.getSource()==eq)
  {
    //x=5;
    z=Integer.parseInt(t1.getText());
    s1="";
    t1.setText("");
try{
   ci=(calintf)Naming.lookup("rmi://127.0.0.1/calc");
    switch(x)
    {

      case 1:ans=ci.radt(z,y);
                // t1.setText(String.valueOf(ans));
                 break;
      case 2:ans=ci.rsub(y,z);
                 //t1.setText(String.valueOf(ans));
                 break;
      case 3:ans=ci.rmul(y,z);
                 //t1.setText(String.valueOf(ans));
                 break;
      case 4:ans=ci.rdiv(y,z);
                 t1.setText(String.valueOf(ans));
                 break;
     }
    }catch(Exception ex){}
    t1.setText(String.valueOf(ans));

    
   }

  }
  
}

Edited 13 Years Ago by Jessurider because: n/a

3 Contributors
7 Replies
126 Views
2 Days Discussion Span
Latest Post 13 Years Ago Latest Post by jwenting

mKorbel 274 Veteran Poster

13 Years Ago

start with calculator view, replace all int to double, in all classes

I don't want to help you with that longer ..., nothing special but view to GUI is correct, not nice or ....

import java.awt.event.*;
import java.awt.*;
import java.math.RoundingMode;
import java.rmi.*;
import java.text.NumberFormat;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JPanel;
//<applet code=Clint.class width=200 height=200></applet>
public class Clint extends JApplet implements ActionListener {

    private static final long serialVersionUID = 1L;
    private JButton b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ad, sb, ml, dv, eq, clr;
    private int x = 0;
    private double y = 0, z = 0, s = 0, ans;
    private double s1;
    private JFormattedTextField t1;
    private calintf ci;
    private JPanel inputPanel = new JPanel();
    private JPanel buttonPanel = new JPanel();

    @Override
    public void init() {
        inputPanel = new JPanel();
        inputPanel.setPreferredSize(new Dimension(400, 30));
        inputPanel.setLayout(new BorderLayout(5, 5));
        buttonPanel = new JPanel();
        buttonPanel.setPreferredSize(new Dimension(400, 400));
        buttonPanel.setLayout(new GridLayout(4, 4, 5, 5));
        s1 = 0;
        NumberFormat dblFormat = NumberFormat.getNumberInstance();
        dblFormat.setMinimumFractionDigits(0);
        dblFormat.setMaximumFractionDigits(9);
        dblFormat.setRoundingMode(RoundingMode.HALF_UP);

        t1 = new JFormattedTextField(dblFormat);
        t1.setValue(0);
        t1.addFocusListener(new FocusListener() {

            @Override
            public void focusGained(FocusEvent e) {
                t1.requestFocus();
                t1.setText(t1.getText());
                t1.selectAll();
            }

            @Override
            public void focusLost(FocusEvent e) {
            }
        });
        inputPanel.add(t1, BorderLayout.CENTER);
        clr = new JButton("Clr");
        clr.addActionListener(this);
        buttonPanel.add(clr);
        b1 = new JButton("1");
        b1.addActionListener(this);
        buttonPanel.add(b1);
        b2 = new JButton("2");
        buttonPanel.add(b2);
        b2.addActionListener(this);
        b3 = new JButton("3");
        buttonPanel.add(b3);
        b3.addActionListener(this);
        b4 = new JButton("4");
        buttonPanel.add(b4);
        b4.addActionListener(this);
        b5 = new JButton("5");
        buttonPanel.add(b5);
        b5.addActionListener(this);
        b6 = new JButton("6");
        buttonPanel.add(b6);
        b6.addActionListener(this);
        b7 = new JButton("7");
        buttonPanel.add(b7);
        b7.addActionListener(this);
        b8 = new JButton("8");
        buttonPanel.add(b8);
        b8.addActionListener(this);
        b9 = new JButton("9");
        buttonPanel.add(b9);
        b9.addActionListener(this);
        b0 = new JButton("0");
        buttonPanel.add(b0);
        b0.addActionListener(this);
        sb = new JButton("-");
        buttonPanel.add(sb);
        sb.addActionListener(this);
        ad = new JButton("+");
        buttonPanel.add(ad);
        ad.addActionListener(this);
        ml = new JButton("*");
        buttonPanel.add(ml);
        ml.addActionListener(this);
        dv = new JButton("/");
        buttonPanel.add(dv);
        dv.addActionListener(this);
        eq = new JButton("=");
        buttonPanel.add(eq);
        eq.addActionListener(this);
        setLayout(new BorderLayout(5, 5));
        setPreferredSize(new Dimension(600, 600));
        setLayout(new BorderLayout(5, 5));
        add(inputPanel, BorderLayout.NORTH);
        add(buttonPanel, BorderLayout.CENTER);
        setVisible(true);
    }

and debug that with System.out.println(tested value)

mKorbel 274 Veteran Poster

13 Years Ago

y = (((Number) t1.getValue()).doubleValue());

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Jessurider -10 Posting Whiz in Training · Answer 1 · 2011-04-12T06:55:22+00:00

Jessurider -10 Posting Whiz in Training

13 Years Ago

anybody please help me................

jwenting commented: patience, young grasshopper -3

Jessurider -10 Posting Whiz in Training · Answer 2 · 2011-04-12T22:52:59+00:00

Jessurider -10 Posting Whiz in Training

13 Years Ago

help me,,,
i'm getting a java.lang.NullPointerException

Edited 13 Years Ago by Jessurider because: n/a

Jessurider -10 Posting Whiz in Training · Answer 3 · 2011-04-13T18:42:32+00:00

hey i want the attached rmi program to be corrected.............the above code is not in rmi format

mKorbel 274 Veteran Poster · Answer 4 · 2011-04-13T18:50:38+00:00

are you done with:

1/ start with calculator view
2/ replace all int to double, in all classes
3/ get number value from JForrmatedTextField

I think that you're shot to the dark, haven't you, because a.m. changes could *** (upTo) half hour

now I'm outta from this thread,

jwenting 1,889 duckman Team Colleague · Answer 5 · 2011-04-13T19:33:57+00:00

jwenting 1,889 duckman

13 Years Ago

We're not a code review service...