import javax.swing.*;
import java.awt.*;
class Calculator{
JFrame frame;
JPanel panel1, panel2;
JTextField textField;
JButton button[];
Container contentPane;
void launchFrame(){
frame = new JFrame("My Calculator");
panel1 = new JPanel();
panel2 = new JPanel(new GridLayout(4,4));
textField = new JTextField(10);
button = new JButton[17];
for (int i=0; i <10; i++)
button[i] = new JButton(i + "");
button[0] = new JButton("0");
button[1] = new JButton("1");
button[2] = new JButton("2");
button[3] = new JButton("3");
button[4] = new JButton("4");
button[5] = new JButton("5");
button[6] = new JButton("6");
button[7] = new JButton("7");
button[8] = new JButton("8");
button[9] = new JButton("9");
button[10] = new JButton("+");
button[11] = new JButton("-");
button[12] = new JButton("*");
button[13] = new JButton("/");
button[14] = new JButton("=");
button[15] = new JButton("CLR");
button[16] = new JButton(".");
panel1.add(textField);
panel1.add(button[15]);
panel2.add(button[7]);
panel2.add(button[8]);
panel2.add(button[9]);
panel2.add(button[10]);
panel2.add(button[4]);
panel2.add(button[5]);
panel2.add(button[6]);
panel2.add(button[11]);
panel2.add(button[1]);
panel2.add(button[2]);
panel2.add(button[3]);
panel2.add(button[12]);
panel2.add(button[0]);
panel2.add(button[16]);
panel2.add(button[14]);
panel2.add(button[13]);
contentPane.add(panel1, BorderLayout.NORTH);
contentPane.add(panel2, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
public static void main(String args[]){
Calculator calc = new Calculator ();
calc.launchFrame ();
}
}Hello everyone. Could someone help me in fixing these codes. JCreator compiles the codes with no problem, but after I run it an error shows.
Configuration: <Default>--------------------
Exception in thread "main" java.lang.NullPointerException
at Calculator.launchFrame(Calculator.java:58)
at Calculator.main(Calculator.java:66)
Process completed.
Please help me with this. Thanks!! ^_^