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Title Simple Calculator in Java Using Remote Method Invocation
Author Satish.K
Author Email fly_sati [at] yahoo.co.in
Description This is a java program for simple arithmetic calculationsusing the principles of Remote Method Invocation (RMI).
Category Java » Beginners / Lab Assignments
Hits 113682
Code Select and Copy the Code
//mathServer// import java.rmi.*; import java.rmi.Naming.*; import java.rmi.server.*; import java.rmi.registry.*; import java.net.*; import java.util.*; interface mathInterface extends Remote { public int add(int a,int b) throws RemoteException; public int subt(int a,int b) throws RemoteException; public int mult(int a,int b) throws RemoteException; public int div(int a,int b) throws RemoteException; } public class mathServer extends UnicastRemoteObject implements mathInterface { public mathServer() throws RemoteException { System.out.println("Initializing Server"); } public int add(int a,int b) { return(a+b); } public int subt(int a,int b) { return(a-b); } public int mult(int a,int b) { return(a*b); } public int div(int a,int b) { return(a/b); } public static void main(String args[]) { try { mathServer ms=new mathServer(); java.rmi.Naming.rebind("MathServ",ms); System.out.println("Server Ready"); } catch(RemoteException RE) { System.out.println("Remote Server Error:"+ RE.getMessage()); System.exit(0); } catch(MalformedURLException ME) { System.out.println("Invalid URL!!"); } } } //mathClient// import java.rmi.*; import java.rmi.registry.*; import java.awt.*; import java.awt.event.*; public class mathClient extends Frame implements ActionListener { Button B1=new Button("Sum"); Button B2=new Button("Subtract"); Button B3=new Button("Multiply"); Button B4=new Button("Divide"); Label l1=new Label("Number 1"); Label l2=new Label("Number 2"); Label l3=new Label("Result"); TextField t1=new TextField(20); TextField t2=new TextField(20); TextField t3=new TextField(20); public mathClient() { super("Calculator"); setLayout(null); l1.setBounds(20,50,55,25); add(l1); l2.setBounds(20,100,55,25); add(l2); l3.setBounds(20,150,55,25); add(l3); t1.setBounds(150,50,100,25); add(t1); t2.setBounds(150,100,100,25); add(t2); t3.setBounds(150,150,100,25); add(t3); B1.setBounds(20,200,80,25); add(B1); B2.setBounds(100,200,80,25); add(B2); B3.setBounds(180,200,80,25); add(B3); B4.setBounds(260,200,80,25); add(B4); B1.addActionListener(this); B2.addActionListener(this); B3.addActionListener(this); B4.addActionListener(this); addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } } ); } public void actionPerformed(ActionEvent AE) { if(AE.getSource()==B1) { sum(); } else if(AE.getSource()==B2) { subt(); } else if(AE.getSource()==B3) { mult(); } else if(AE.getSource()==B4) { div(); } } public void sum() { int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.add(i,j); t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } } public void subt() { int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.subt(i,j); t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } } public void mult() { int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.mult(i,j); t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } } public void div() { int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.div(i,j); t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } } public static void main(String args[]) { mathClient MC=new mathClient(); MC.setVisible(true); MC.setSize(600,500); }; }

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