Catch (Exception str)

{

jTextArea1.setText("Введите исходные данные");

}

}

public static void main(String args[]) {

try {

for (javax.swing.UIManager.LookAndFeelInfo info: javax.swing.UIManager.getInstalledLookAndFeels()) {

if ("Nimbus".equals(info.getName())) {

Javax.swing.UIManager.setLookAndFeel(info.getClassName());

Break;

}

}

} catch (ClassNotFoundException ex) {

Java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (InstantiationException ex) {

Java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (IllegalAccessException ex) {

Java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (javax.swing.UnsupportedLookAndFeelException ex) {

Java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

}

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

New NewJFrame().setVisible(true);

}

});

}

8.

Main.java:

Import javax.swing.JFrame;

public static void main(String[] args) {

NewJFrame frame = new NewJFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Frame.show();

}

MainJFrame.java:

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

//запись данных

Try

{

double a=Double.parseDouble(jTextField1.getText());

double b=Double.parseDouble(jTextField2.getText());

double c=Double.parseDouble(jTextField3.getText());

Read_Write write =new Read_Write();

JTextArea1.setText(write.write_file(a, b, c));

}