Question

在这些代码中，我会获得有多少作业可用的信息（JobCount）以及下一个JFrame我想要JobCount次JToggleButtton的信息。但JobCount未正确传递。我怎样才能使它能从帧中传递信息？

public class NewJFrame extends javax.swing.JFrame {

public NewJFrame() {
    initComponents();
}
  public int PeopleCount;
public int JobCount;
public  JFrame2 jf2;

private void PJCountjButtonActionPerformed(java.awt.event.ActionEvent evt) {                                               
    PeopleCount=(int)(PeopleCountjSpinner.getValue());
    JOptionPane.showMessageDialog(null, "peoplecount="+PeopleCount);
    JobCount=(int)(JobCountjSpinner.getValue());
    jf2=new JFrame2();
    jf2.setVisible(true);
    jf2.c1=this;
    this.setVisible(false);  
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new NewJFrame().setVisible(true);
        }
    });
}
public class JFrame2 extends javax.swing.JFrame {

int j;
public NewJFrame c1 = new NewJFrame();

JPanel contentpane;
JButton show;
public JButton[] jbarray = new JButton[c1.JobCount];
public int array[][] = new int[c1.PeopleCount][c1.JobCount];

public JFrame2() {
    initComponents();
    JOptionPane.showMessageDialog(null, "peoplecount="+c1.PeopleCount);
    this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
    this.setBounds(10, 01, 500, 400);
    this.contentpane = new JPanel();
    this.show = new JButton("Show array");
    contentpane.add(show);

    for (j = 0; j < c1.JobCount; j++) {
        this.jbarray[j] = new JButton("job" + (j + 1));
        contentpane.add(jbarray[j]);
    }

    this.setContentPane(contentpane);
    this.setVisible(true);
}}
    // Variables declaration - do not modify                     
private javax.swing.JSpinner JobCountjSpinner;
private javax.swing.JButton PJCountjButton;
private javax.swing.JSpinner PeopleCountjSpinner;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
// End of variables declaration          }

Answer 1

不要使用Multiple JFrame，因为这是一个不好的做法，你可以使用一个JFrame和许多JDialog，如：

private void PJCountjButtonActionPerformed(java.awt.event.ActionEvent evt) {                                               
PeopleCount=(int)(PeopleCountjSpinner.getValue());
JOptionPane.showMessageDialog(null, "peoplecount="+PeopleCount);
JobCount=(int)(JobCountjSpinner.getValue());
JDialog dialog = new CustomConstructor(params.) // here you can creaea your own constructor and pass the needed info.
dialog.setVisible(true);
}

Answer 2

peeskillet说的是正确的。

private int jobCount;

public int getJobCount() {
    return jobCount;
}

public void setJobCount(int jobCount) {
    this.jobCount = jobCount;
}

其次是：

public class JFrame2() {
    int passedJobCount = c1.getJobCount();
}

这就是你正确使用私有变量的方法。如需进一步阅读，请查看Oracle's Tutorial on Member Declarations。

Answer 3

除了我认为，在帧之间共享值不是一个好习惯，我建议如果真的需要那样，只需将jobCount存储为整数对象并在需要的地方存储它的引用。这样它始终是最新的。

如果我理解你的意图是正确的，你只想为每个工作和个人制作一个按钮控制面板，你可以在一个视图中完成所有这些操作。只需使用frame1通过滑块获取计数，然后动态添加slider.value的按钮。您可以使用默认的borderlayout并将滑块向北和按钮放在中心。

这个小小的ssce可以帮助你走上正轨：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class NewJFrame extends javax.swing.JFrame {

private static final long serialVersionUID = 1L;
private JSlider slider;
private JButton btnNewButton;
private JDialog d;
private JTextField text;

public NewJFrame() {

    btnNewButton = new JButton("Do");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            d.setVisible(true);
        }
    });
    getContentPane().add(btnNewButton, BorderLayout.CENTER);

    slider = new JSlider();
    slider.addChangeListener(new ChangeListener() {
        public void stateChanged(ChangeEvent e) {
            text.setText(Integer.toString(slider.getValue()));
        }
    });

    getContentPane().add(slider, BorderLayout.NORTH);

    d = new JDialog();
    text = new JTextField();
    d.getContentPane().add(text);
    d.pack();

    pack();
    setVisible(true);
}

public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new NewJFrame().setVisible(true);
        }
    });
}
}

从JFrames传递信息

3 个答案: