线程“ Thread-3”中的异常java.lang.NumberFormatException：对于输入字符串：“”

Question

So my main plan is to have a GUI with a button and two jTextFields . When the button is pressed it starts a new thread of the Runnah class I have made. The Runnah class is suppose to get the input from the text fields;

The Runnah class then gets a NumberFormatException when I run gui.getSeconds();

The MainGUI Class

public class MainGUI extends javax.swing.JFrame {

Runnah runnah;
Thread thread;

public MainGUI() {
    initComponents();
    //runnah = new Runnah();
}                        

private void startButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
    try {
        runnah = new Runnah();
    } catch (AWTException ex) {
        Logger.getLogger(MainGUI.class.getName()).log(Level.SEVERE, null, ex);
    }
    thread = new Thread(runnah);
    thread.start();
}                                           

public String getInput(){
    String temp = textInp.getText();
    return temp;
}
public int getSeconds(){
    return Integer.parseInt(secInp.getText());
}

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
                new MainGUI().setVisible(true);
        }
    });
}
// Variables declaration - do not modify                     
private javax.swing.JTextField secInp;
private javax.swing.JButton startButton;
private javax.swing.JTextField textInp;
// End of variables declaration                   
}

The Runnah Class

public class Runnah implements Runnable{

private MainGUI gui;

private Robot robot;

public Runnah() throws AWTException{
    this.robot = new Robot();
    gui = new MainGUI();
}

public Runnah(Robot robot) {
    this.robot = robot;
}

@Override
public void run() {

    String temp = gui.getInput();
    CharSequence input = temp;
    int seconds = 1;
    seconds = gui.getSeconds() * 1000;

    robot.delay(seconds);
}

If any more information is needed please let me know.

Answer 1

我只是没有引用现有的MainGUI类。