How to convert java or class file to exe file [duplicate] - java

This question already has answers here:
How can I convert my Java program to an .exe file?
(16 answers)
Closed 8 years ago.
I have been created a java app using swing and I want to convert to an exe file how to do it.
public Performance() {
f = new JFrame("Ticket Booking");
f1 = new JFrame("Payment Details");
f2 = new JFrame("Payment Successfull");
l1 = new JLabel("Movies :");
l2 = new JLabel("Timing :");
l3 = new JLabel("Class:");
l4 = new JLabel();
l5 = new JLabel();
l6 = new JLabel("No of Person:");
l11 = new JLabel("Movies :");
l22 = new JLabel();
l33 = new JLabel("Timing :");
l44 = new JLabel();
l55 = new JLabel("Class:");
l66 = new JLabel();
l77 = new JLabel("No of Person:");
l88 = new JLabel();
l99 = new JLabel("Amount:");
l00 = new JLabel();
lsuccess = new JLabel(" Thank u For booking Ticket...");
c1 = new JComboBox(s1);
c2 = new JComboBox(s2);
r1 = new JRadioButton("10:00pm");
r2 = new JRadioButton("1:00pm");
r3 = new JRadioButton("4:30pm");
buttongroup = new ButtonGroup();
b1 = new JButton("Submit");
b11 = new JButton("Pay Bill");
b22 = new JButton("Edit");
t1 = new JTextField(10);
}


To convert (actually, package) .class files into .jar files, you use the Jar tool. You can then generate a .exe file from the .jar using tools like Launch4j, JSmooth or several other packages (search the web for "jar exe").

Related

Is there a simple way to create several TextFields with JavaFX?

I am attempting to create about a dozen TextFields and was wondering if there is a quick and easy way to do this.
tfTime1 = new TextField();
tfActivity1 = new TextField();
tfTime2 = new TextField();
tfActivity2 = new TextField();
tfTime3 = new TextField();
tfActivity3 = new TextField();
tfTime4 = new TextField();
tfActivity4 = new TextField();
tfTime5 = new TextField();
tfActivity5 = new TextField();
tfTime6 = new TextField();
tfActivity6 = new TextField();
I feel like there's a more efficient way of doing this that I am not aware of

You could use a simple for loop to add new TextFields to a List:
List<TextField> timeTextFields = new ArrayList<>();
for (int i = 0; i < 5; i++) {
timeTextFields.add(new TextField("Time #" + i));
}

Creating a new JFrame inside actionPerformed() method , and then how can i perform action with this JFrame's JButton

I'm very new to java.My question is,is it possible to use JButton v,v1 ? Inside this actionPerformed() method ? If it is possible,then how ?
Thanks in advance .
PlaceOrder.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class PlaceOrder extends JFrame implements ActionListener
{
JButton confirm,cancel,logOut;
JRadioButton rb1,rb2,rb3,rb4,rb5,rb6,rb7,rb8;
JTextField r1,r2,r3,r4,r5,r6,r7,r8;
JLabel Item,Quantity;
Food f[] = new Food[10];
double total = 0;
public PlaceOrder()
{
f[0] = new Food("Chicken Burger",120);
f[1] = new Food("Chicken BBQ Burger",150);
f[2] = new Food("Chicken BBQ Cheese Burger",170);
f[3] = new Food("Beef Burger",130);
f[4] = new Food("Beef BBQ Burger",160);
f[5] = new Food("Pizza",180);
f[6] = new Food("Coffee",80);
f[7] = new Food("Soft Drinks(Can)",35);
setSize(700,700);
setVisible(true);
setLayout(null);
rb1 = new JRadioButton("Chicken Burger");
rb2 = new JRadioButton("Chicken BBQ Burger");
rb3 = new JRadioButton("Chicken BBQ Cheese Burger");
rb4 = new JRadioButton("Beef Burger");
rb5 = new JRadioButton("Beef BBQ Burger");
rb6 = new JRadioButton("Pizza");
rb7 = new JRadioButton("Coffee");
rb8 = new JRadioButton("Soft Drinks(Can)");
rb1.setBounds(150,100,150,30);
add(rb1);
rb2.setBounds(150,130,150,30);
add(rb2);
rb3.setBounds(150,160,150,30);
add(rb3);
rb4.setBounds(150,190,150,30);
add(rb4);
rb5.setBounds(150,220,150,30);
add(rb5);
rb6.setBounds(150,250,150,30);
add(rb6);
rb7.setBounds(150,280,150,30);
add(rb7);
rb8.setBounds(150,310,150,30);
add(rb8);
r1 = new JTextField();
r2 = new JTextField();
r3 = new JTextField();
r4 = new JTextField();
r5 = new JTextField();
r6 = new JTextField();
r7 = new JTextField();
r8 = new JTextField();
Item = new JLabel("Item");
Quantity = new JLabel("Quantity");
Item.setBounds(160,20,100,50);
add(Item);
Quantity.setBounds(360,20,100,50);
add(Quantity);
r1.setBounds(350,100,150,20);
add(r1);
r2.setBounds(350,130,150,20);
add(r2);
r3.setBounds(350,160,150,20);
add(r3);
r4.setBounds(350,190,150,20);
add(r4);
r5.setBounds(350,220,150,20);
add(r5);
r6.setBounds(350,250,150,20);
add(r6);
r7.setBounds(350,280,150,20);
add(r7);
r8.setBounds(350,310,150,20);
add(r8);
confirm = new JButton("Order Status");
cancel = new JButton("Cancel Order");
logOut = new JButton("LogOut");
confirm.setBounds(150,500,120,30);
add(confirm);
cancel.setBounds(380,500,120,30);
add(cancel);
logOut.setBounds(550,50,80,30);
add(logOut);
confirm.addActionListener(this);
cancel.addActionListener(this);
logOut.addActionListener(this);
}
public void actionPerformed(ActionEvent a)
{
if(a.getSource() == confirm)
{
JFrame YourOrder = new JFrame();
YourOrder.setSize(700,800);
YourOrder.setLayout(null);
YourOrder.setVisible(true);
JLabel confirmation = new JLabel("Your Order");
confirmation.setBounds(250,30,150,30);
YourOrder.add(confirmation);
JLabel s[] = new JLabel[3];
s[0] = new JLabel("Item");
s[0].setBounds(100,100,50,30);
YourOrder.add(s[0]);
s[1] = new JLabel("Quantity");
s[1].setBounds(250,100,50,30);
YourOrder.add(s[1]);
s[2] = new JLabel("Total");
s[2].setBounds(400,100,50,30);
YourOrder.add(s[2]);
JLabel l,l1,l2;
JLabel netTotal = new JLabel("Net Amount = ");
netTotal.setBounds(400,550,100,30);
YourOrder.add(netTotal);
JButton v,v1;
v = new JButton("Change");
v.setBounds(100,600,100,30);
YourOrder.add(v);
v.addActionListener(this);
v1 = new JButton("Confirm Order");
v1.setBounds(400,600,120,30);
YourOrder.add(v1);
v1.addActionListener(this);
if(rb1.isSelected() && r1.getText() != "")
{
total = total + ((Integer.parseInt(r1.getText()))*(f[0].getFoodPrice()));
l = new JLabel(rb1.getText());
l.setBounds(100,150,100,30);
YourOrder.add(l);
l1 = new JLabel(r1.getText());
l1.setBounds(250,150,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r1.getText()))*(f[0].getFoodPrice())));
l2.setBounds(400,150,100,30);
YourOrder.add(l2);
}
if(rb2.isSelected() && r2.getText() != "")
{
total = total + ((Integer.parseInt(r2.getText()))*(f[1].getFoodPrice()));
l = new JLabel(rb2.getText());
l.setBounds(100,200,100,30);
YourOrder.add(l);
l1 = new JLabel(r2.getText());
l1.setBounds(250,200,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r2.getText()))*(f[1].getFoodPrice())));
l2.setBounds(400,200,100,30);
YourOrder.add(l2);
}
if(rb3.isSelected() && r3.getText() != "")
{
total = total + ((Integer.parseInt(r3.getText()))*(f[2].getFoodPrice()));
l = new JLabel(rb3.getText());
l.setBounds(100,250,100,30);
YourOrder.add(l);
l1 = new JLabel(r3.getText());
l1.setBounds(250,250,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r3.getText()))*(f[2].getFoodPrice())));
l2.setBounds(400,250,100,30);
YourOrder.add(l2);
}
if(rb4.isSelected() && r4.getText() != "")
{
total = total + ((Integer.parseInt(r4.getText()))*(f[3].getFoodPrice()));
l = new JLabel(rb4.getText());
l.setBounds(100,300,100,30);
YourOrder.add(l);
l1 = new JLabel(r4.getText());
l1.setBounds(250,300,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r4.getText()))*(f[3].getFoodPrice())));
l2.setBounds(400,300,100,30);
YourOrder.add(l2);
}
if(rb5.isSelected() && r5.getText() != "")
{
total = total + ((Integer.parseInt(r5.getText()))*(f[4].getFoodPrice()));
l = new JLabel(rb5.getText());
l.setBounds(100,350,100,30);
YourOrder.add(l);
l1 = new JLabel(r5.getText());
l1.setBounds(250,350,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r5.getText()))*(f[4].getFoodPrice())));
l2.setBounds(400,350,100,30);
YourOrder.add(l2);
}
if(rb6.isSelected() && r6.getText() != "")
{
total = total + ((Integer.parseInt(r6.getText()))*(f[5].getFoodPrice()));
l = new JLabel(rb6.getText());
l.setBounds(100,400,100,30);
YourOrder.add(l);
l1 = new JLabel(r6.getText());
l1.setBounds(250,400,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r6.getText()))*(f[5].getFoodPrice())));
l2.setBounds(400,400,100,30);
YourOrder.add(l2);
}
if(rb7.isSelected() && r7.getText() != "")
{
total = total + ((Integer.parseInt(r7.getText()))*(f[6].getFoodPrice()));
l = new JLabel(rb7.getText());
l.setBounds(100,450,100,30);
YourOrder.add(l);
l1 = new JLabel(r7.getText());
l1.setBounds(250,450,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r7.getText()))*(f[6].getFoodPrice())));
l2.setBounds(400,450,100,30);
YourOrder.add(l2);
}
if(rb8.isSelected() && r8.getText() != "")
{
total = total + ((Integer.parseInt(r8.getText()))*(f[7].getFoodPrice()));
l = new JLabel(rb8.getText());
l.setBounds(100,500,100,30);
YourOrder.add(l);
l1 = new JLabel(r8.getText());
l1.setBounds(250,500,100,30);
YourOrder.add(l1);
l2 = new JLabel(String.valueOf((Integer.parseInt(r8.getText()))*(f[7].getFoodPrice())));
l2.setBounds(400,500,100,30);
YourOrder.add(l2);
}
JLabel pay = new JLabel(String.valueOf(total));
pay.setBounds(500,550,100,30);
YourOrder.add(pay);
if(a.getSource() == v)
{
YourOrder.setVisible(false);
}
else if(a.getSource() == v1)
{
JOptionPane.showMessageDialog(this,"Printing Invoice ...");
}
}
else if(a.getSource() == cancel)
{
this.setVisible(false);
PlaceOrder o1 = new PlaceOrder();
}
else
{
this.setVisible(false);
}
}
}
Food.java
class Food
{
private String foodName;
private double foodPrice;
public Food(String foodName,double foodPrice)
{
this.foodName = foodName;
this.foodPrice = foodPrice;
}
public String getFoodName()
{
return this.foodName;
}
public double getFoodPrice()
{
return this.foodPrice;
}
}
These two classes ..

My guess: you want to be able to refer to the local variables in your code image above, v and v1, but being local to the method, their scope or "visibility" is also limited to the method. If so, then get that code out of the actionPerformed and instead into its own class, one that creates a JPanel that is set up as you desire. You can then make v and v1 fields of the class, and allow outside code access to necessary properties via getter methods.
If you need more detailed help and less guesses, again please post a viable mcve. If you do this, we can work with and even sometimes help enhance your code.
Other issues: avoid null layouts and setBounds since these lead to rigid and hard to enhance GUI's that look bad on most platforms other than your own.
Also check out The Use of Multiple JFrames, Good/Bad Practice?
Edit
That confirm order window should be a modal JDialog and not a JFrame. You want the program to stop and not go forward until the user has dealt with it, which is what a modal dialog will do. Also, I would use JSpinner and not JTextFields to get the quantity information. Why? You must always assume that the user is an idiot, and using a JSpinner you would prevent the user from entering non-numeric or other incorrect information.

No matter but Authentication Fails - Java - Swing

I have tried all the changes but It shows invalid credentials. Please please to solve this out.
It simply rejects the combination and i am confused about it.
It is a logical error.
I want to add Username to table once it works.
I added all packages and removed all exceptions but it doesn't work.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Authenticate extends JFrame implements ActionListener
{
JLabel l1,l2,l3,l4,l5,l6,l7,l8;
JPasswordField jp1,jp2;
JComboBox c1,c2,c3;
JTextField t1,t2,t3;
JTextArea ta;
JButton jb1,jb2;
String[] day = new String[31];
String[] year = new String[40];
String[] month = new String[12];
public Authenticate()
{
Container c = getContentPane();
c.setLayout(new FlowLayout(FlowLayout.CENTER));
l1 = new JLabel("Name");
l2 = new JLabel("E-mail ID");
l3 = new JLabel("Address");
l4 = new JLabel("User name");
l5 = new JLabel("Password");
l6 = new JLabel("Confirm Password");
l7 = new JLabel("DOB");
l8 = new JLabel(" ");
jp1 = new JPasswordField(10);
jp2 = new JPasswordField(10);
jp1.setEchoChar('$');
jp2.setEchoChar('*');
t1 = new JTextField(10);
t2 = new JTextField(10);
t3 = new JTextField(10);
ta = new JTextArea(3,15);
jb1 = new JButton("Submit");
jb2 = new JButton("Reset");
for(int i=0;i<31;i++)
{
day[i] = String.valueOf(i+1);
}
for(int i=0;i<35;i++)
{
year[i] = String.valueOf(i+1980);
}
month[0] = "January";
month[1] = "February";
month[2] = "March";
month[3] = "April";
month[4] = "May";
month[5] = "June";
month[6] = "July";
month[7] = "August";
month[8] = "September";
month[9] = "October";
month[10] = "November";
month[11] = "December";
c1 = new JComboBox(day);
c2 = new JComboBox(month);
c3 = new JComboBox(year);
jb1.addActionListener(this);
jb2.addActionListener(this);
c.add(l1);
c.add(t1);
c.add(l2);
c.add(t2);
c.add(l3);
c.add(ta);
c.add(l4);
c.add(t3);
c.add(l5);
c.add(jp1);
c.add(l6);
c.add(jp2);
c.add(l7);
c.add(c1);
c.add(c2);
c.add(c3);
c.add(jb1);
c.add(jb2);
c.add(l8);
setSize(500,500);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent ae)
{
String s = ae.getActionCommand();
String s1,s2,s3;
s1 = t3.getText();
s2 = jp1.getText();
s3 = jp2.getText();
if(s.equals("Submit")) //submit btn
{
if(s1.equalsIgnoreCase("Ghiridhar") && s2.equals("Achiever") && s2==s3) // right credentials
l8.setText("Login Successful");
else
{
l8.setText("Invalid Credentials");
t3.setText(" ");
jp1.setText("");
jp2.setText("");
} //else
} //inner if
else // reset btn
{
t1.setText(" ");
t2.setText(" ");
t3.setText(" ");
ta.setText(" ");
jp1.setText("");
jp2.setText("");
l8.setText(" ");
} //else
} // action fn
public static void main(String a[])
{
Authenticate a1 = new Authenticate();
}
}
Please assist on this aspect.

If you are trying to compare text in s2 and s3 then it should be like:
s2.equals(s3)
instead of
s2==s3.
Because String is compared with equals().
And please indent your code as other people suggested

Format of JPanel

I have set of code that seems somewhat messy. I was wondering how to tidy it up
JPanel inventory = new JPanel();
JPanel options = new JPanel();
JPanel planet = new JPanel();
JPanel mainPanel = new JPanel();
JFrame mainFrame = new JFrame("Inventory");
inventTitle = new JLabel("Inventory");
inventMoney = new JLabel(" - " + money);
optTitle = new JLabel("Options");
opt1Label = new JLabel("Mine Ice -1 P, +100 M");
opt2Label = new JLabel("Heat Planet -500 M, +10T");
opt3Label = new JLabel("BLANK");
opt4Label = new JLabel("BLANK");
opt5Label = new JLabel("BLANK");
opt6Label = new JLabel("BLANK");
opt7Label = new JLabel("BLANK");
opt8Label = new JLabel("BLANK");
opt9Label = new JLabel("BLANK");
JButton opt1 = new JButton("1");
JButton opt2 = new JButton("2");
JButton opt3 = new JButton("3");
JButton opt4 = new JButton("4");
JButton opt5 = new JButton("5");
JButton opt6 = new JButton("6");
JButton opt7 = new JButton("7");
JButton opt8 = new JButton("8");
JButton opt9 = new JButton("9");
mainPanel.setLayout(null);
mainPanel.add(inventory);
mainPanel.add(options);
mainPanel.add(planet);
mainPanel.setOpaque(true);
mainPanel.setBackground(Color.WHITE);
inventory.setLayout(new BoxLayout(inventory, 1));
inventory.add(inventTitle);
inventory.setOpaque(true);
inventory.setBackground(Color.RED);
inventory.setBounds(0, 0, 360, 400);
inventory.add(inventMoney);
I saw somewhere a way of setting it like a method.

You can use a for loop instead of writing the same statements multiple times.
JLabel optLabel[] = new JLabel[9];
JButton opt[] = new JButton[9];
for (int i = 0; i < 9 ; i++) {
optLabel[i] = new JLabel ("BLANK");
opt[i] = new JButton (Integer.valueOf (i + 1).toString());
}

java.lang.numberformatexception empty string java awt

public class CustomCalculator extends Frame implements ActionListener{
Panel jp1 = new Panel();
Panel jp2 = new Panel();
Panel jp3 = new Panel();
Panel jp4 = new Panel();
Panel jp5 = new Panel();
Panel center_merge = new Panel();
Label l2 = new Label("Quantity : ");
TextField l2a = new TextField(20);
Label l3 = new Label("Invoice Value : ");
TextField l3a = new TextField(20);
Label l4 = new Label("Exchange Rate : ");
TextField l4a = new TextField(20);
Label l5 = new Label("Costing(A) : ");
TextField l5a = new TextField();
Label l6 = new Label("(A + 1%)(B) : ");
Label l6a = new Label();
Label l7 = new Label("BCD (C) : ");
Label l7a = new Label("");
Label l8 = new Label("CVD (D) : ");
Label l8a = new Label("");
Label l9 = new Label("Custom Education Cess (E) : ");
Label l9a = new Label("");
Label l10 = new Label("Custom Sec & Higher Edu.Cess (F) : ");
Label l10a = new Label("");
Label l11 = new Label("Additional Duty Imports (G) : ");
Label l11a = new Label("");
Label l12 = new Label("Total (H) : ");
Label l12a = new Label("");
Label l13 = new Label("Costing+Total (I) : ");
Label l13a = new Label("");
Label l14 = new Label("(H/Quantity) (J) : ");
Label l14a = new Label("");
Label l15 = new Label("4% SAD (G/Quantity) (K) : ");
Label l15a = new Label("");
Label l16 = new Label("Net Costing (L) : ");
Label l16a = new Label("");
Label l17 = new Label("Transportation (M) : ");
TextField l17a = new TextField(5);
Label l18 = new Label("Godown Rate (N) : ");
TextField l18a = new TextField(5);
Label l19 = new Label("Brokerage (O) : ");
TextField l19a = new TextField(5);
Label l20 = new Label("Actual Costing (P) : ");
Label l20a = new Label("");
Label l21 = new Label("Small Gatepass (Q) : ");
Label l21a = new Label("");
Label l22 = new Label("Big Gatepass (R) : ");
Label l22a = new Label("");
Button l2b = new Button("reset");
Button l3b = new Button("reset");
Button l4b = new Button("reset");
Button master_reset = new Button("reset all");
Button calc = new Button("Calculate");
public CustomCalculator()
{
super("Custom Calculator");
this.setSize(800,700);
jp1.setLayout(new FlowLayout());
//jp1.setBorder(BorderFactory.createLineBorder(Color.GRAY));
jp1.add(l2);
jp1.add(l2a);
jp1.add(l2b);
jp1.add(l3);
jp1.add(l3a);
jp1.add(l3b);
jp1.add(l4);
jp1.add(l4a);
jp1.add(l4b);
jp2.setLayout(new GridLayout(6,2));
//jp2.setBorder(BorderFactory.createLineBorder(Color.GRAY));
jp2.add(l5);
jp2.add(l5a);
jp2.add(l6);
jp2.add(l6a);
jp2.add(l7);
jp2.add(l7a);
jp2.add(l8);
jp2.add(l8a);
jp2.add(l9);
jp2.add(l9a);
jp2.add(l10);
jp2.add(l10a);
jp3.setLayout(new GridLayout(6,2));
//jp3.setBorder(BorderFactory.createLineBorder(Color.GRAY));
jp3.add(l11);
jp3.add(l11a);
jp3.add(l12);
jp3.add(l12a);
jp3.add(l13);
jp3.add(l13a);
jp3.add(l14);
jp3.add(l14a);
jp3.add(l15);
jp3.add(l15a);
jp3.add(l16);
jp3.add(l16a);
jp4.setLayout(new GridLayout(6,2));
//jp4.setBorder(BorderFactory.createLineBorder(Color.GRAY));
jp4.add(l17);
jp4.add(l17a);
jp4.add(l18);
jp4.add(l18a);
jp4.add(l19);
jp4.add(l19a);
jp4.add(l20);
jp4.add(l20a);
jp4.add(l21);
jp4.add(l21a);
jp4.add(l22);
jp4.add(l22a);
center_merge.setLayout(new GridLayout(1,3));
//center_merge.setBorder(BorderFactory.createLineBorder(Color.GRAY));
center_merge.add(jp2);
center_merge.add(jp3);
center_merge.add(jp4);
jp5.setLayout(new FlowLayout());
//jp5.setBorder(BorderFactory.createLineBorder(Color.GRAY));
jp5.add(calc);
jp5.add(master_reset);
this.setLayout(new BorderLayout());
this.add(jp1,BorderLayout.NORTH);
this.add(center_merge,BorderLayout.CENTER);
this.add(jp5,BorderLayout.SOUTH);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
l2b.addActionListener(this);
l3b.addActionListener(this);
l4b.addActionListener(this);
calc.addActionListener(this);
master_reset.addActionListener(this);
this.setVisible(true);
}
public static void main(String[] args) {
new CustomCalculator();
}
#Override
public void actionPerformed(ActionEvent ae) {
double quantity = 0;
double invoice_value = 0;
double exchange_rate = 0;
double A=0;
double B=0;
double C=0;
double D=0;
double E=0;
double F=0;
double G=0;
double H=0;
double I=0;
double J=0;
double K=0;
double L=0;
double M = 0;
double N = 0;
double O=0;
double P=0;
double Q=0;
double R=0;
try
{
quantity = Double.parseDouble(l2a.getText());
invoice_value = Double.parseDouble(l3a.getText());
exchange_rate = Double.parseDouble(l4a.getText());
M = Double.parseDouble(l17a.getText());
N = Double.parseDouble(l18a.getText());
O = Double.parseDouble(l19a.getText());
A = invoice_value*exchange_rate;
B = A+(0.01*A);
C = 0.075*B;
D = 0.12*(B+C);
E = 0.02*(C+D);
F = 0.01*(C+D);
G = 0.04*(B+C+D+E+F);
H = C+D+E+F+G;
I = A+H;
J = H/quantity;
K = G/quantity;
L = J-K;
P = L+M+N+O;
Q = (0.12*B)/quantity;
R = Q+K;
if(ae.getActionCommand().equals("calc"))
{
l5a.setText(String.valueOf(A));
l6a.setText(String.valueOf(B));
l7a.setText(String.valueOf(C));
l8a.setText(String.valueOf(D));
l9a.setText(String.valueOf(E));
l10a.setText(String.valueOf(F));
l11a.setText(String.valueOf(G));
l12a.setText(String.valueOf(H));
l13a.setText(String.valueOf(I));
l14a.setText(String.valueOf(J));
l15a.setText(String.valueOf(K));
l16a.setText(String.valueOf(L));
l20a.setText(String.valueOf(P));
l21a.setText(String.valueOf(Q));
l22a.setText(String.valueOf(R));
}
else if(ae.getActionCommand().equals("master_reset"))
{
l5a.setText("");
l2a.setText("");
l3a.setText("");
l4a.setText("");
}
}
catch (Exception ex)
{
l5a.setText(ex.toString());
// l3a.setText(ex.toString());
}
}
}
After I click the Calculate button (button calc) the calculated values do not appear in the respective labels and an exception is shown saying java.lang.NumberFormatException: Empty string. I am not able to figure out the solution. please help.

the line exchange_rate = Double.parseDouble(l4a.getText()); gives you this exception, because there is no value in l4a and you are trying to parse it into a double value,
try printing the exception in the catch clause.

It's probably a relatively safe bet to say that it is happening here at the beginning of your function, though you should provide the actual exception and line number for us.
quantity = Double.parseDouble(l2a.getText());
invoice_value = Double.parseDouble(l3a.getText());
exchange_rate = Double.parseDouble(l4a.getText());
M = Double.parseDouble(l17a.getText());
N = Double.parseDouble(l18a.getText());
O = Double.parseDouble(l19a.getText());
Make sure that each of these fields actually has numeric text in it. I would recommend putting a logging line or an alert line to state their values before this is executed. Better yet, you can catch the first line in a debugger and look at the the values of all of the items you're calling getText() on. I bet one has an empty string.

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