Question

我有10个组合框和一个按钮。是否有一种简单的方法可以设置每个组合框的所有值，然后按下此按钮，它会存储组合框的所有值？

Answer 1

您首先必须遍历所有JComboBox元素并获取其选定状态（即：getSelectedItem()或getSelectedIndex()）。确定选择后，您可以根据需要将选择保存在以后要阅读的许多地方：

您可以将状态保存到以后可以读取的文件中
您可以通过Java Preferences API
如果是网络应用程序，您可以将信息保存在SQL数据库中

Answer 2

当然！我建议给自己写一个有两件事的新课：

class comboTrack{
private JComboBox box;
private Object value;

public comboTrack(JComboBox box){
    this.box = box;
    this.value = box.getSelectedItem();
}

public void update(){
    this.value = box.getSelectedItem();
}
public Object getValue(){
    return value;
}
}

然后，使用这些而不是普通的Boxes。像这样：

//List of boxes (class variable):
    ArrayList<comboTrack> boxes;

    //Inside the button click method:
    for(comboTrack box : boxes){
        box.update();
    }

Answer 3

enter image description here

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.border.EmptyBorder;

public class ComboBoxValues extends JFrame {

    private JPanel contentPane;
    JComboBox comboBox;
    JComboBox comboBox_1;
    JComboBox comboBox_2;
    JComboBox comboBox_3;
    JComboBox comboBox_4;
    JComboBox comboBox_5;
    JComboBox comboBox_6;
    JComboBox comboBox_7;
    JComboBox comboBox_8;
    JComboBox comboBox_9;
    private JTextArea textArea;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ComboBoxValues frame = new ComboBoxValues();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }


    public ComboBoxValues() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        GridBagLayout gbl_contentPane = new GridBagLayout();
        gbl_contentPane.columnWidths = new int[]{0, 0, 0};
        gbl_contentPane.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
        gbl_contentPane.columnWeights = new double[]{1.0, 0.0, Double.MIN_VALUE};
        gbl_contentPane.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, Double.MIN_VALUE};
        contentPane.setLayout(gbl_contentPane);

        comboBox = new JComboBox();
        GridBagConstraints gbc_comboBox = new GridBagConstraints();
        gbc_comboBox.insets = new Insets(0, 0, 5, 5);
        gbc_comboBox.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox.gridx = 0;
        gbc_comboBox.gridy = 0;
        contentPane.add(comboBox, gbc_comboBox);

        comboBox.addItem("comboBox_0 val 1");
        comboBox.addItem("comboBox_0 val 2");

        comboBox_1 = new JComboBox();
        GridBagConstraints gbc_comboBox_1 = new GridBagConstraints();
        gbc_comboBox_1.insets = new Insets(0, 0, 5, 0);
        gbc_comboBox_1.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_1.gridx = 1;
        gbc_comboBox_1.gridy = 0;
        contentPane.add(comboBox_1, gbc_comboBox_1);

        comboBox_1.addItem("comboBox_1 val 1");
        comboBox_1.addItem("comboBox_1 val 2");

        comboBox_2 = new JComboBox();
        GridBagConstraints gbc_comboBox_2 = new GridBagConstraints();
        gbc_comboBox_2.insets = new Insets(0, 0, 5, 5);
        gbc_comboBox_2.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_2.gridx = 0;
        gbc_comboBox_2.gridy = 1;
        contentPane.add(comboBox_2, gbc_comboBox_2);

        comboBox_2.addItem("comboBox_2 val 1");
        comboBox_2.addItem("comboBox_2 val 2");

        comboBox_3 = new JComboBox();
        GridBagConstraints gbc_comboBox_3 = new GridBagConstraints();
        gbc_comboBox_3.insets = new Insets(0, 0, 5, 0);
        gbc_comboBox_3.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_3.gridx = 1;
        gbc_comboBox_3.gridy = 1;
        contentPane.add(comboBox_3, gbc_comboBox_3);

        comboBox_3.addItem("comboBox_3 val 1");
        comboBox_3.addItem("comboBox_3 val 2");

        comboBox_4 = new JComboBox();
        GridBagConstraints gbc_comboBox_4 = new GridBagConstraints();
        gbc_comboBox_4.insets = new Insets(0, 0, 5, 5);
        gbc_comboBox_4.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_4.gridx = 0;
        gbc_comboBox_4.gridy = 2;
        contentPane.add(comboBox_4, gbc_comboBox_4);

        comboBox_4.addItem("comboBox_4 val 1");
        comboBox_4.addItem("comboBox_4 val 2");

        comboBox_5 = new JComboBox();
        GridBagConstraints gbc_comboBox_5 = new GridBagConstraints();
        gbc_comboBox_5.insets = new Insets(0, 0, 5, 0);
        gbc_comboBox_5.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_5.gridx = 1;
        gbc_comboBox_5.gridy = 2;
        contentPane.add(comboBox_5, gbc_comboBox_5);

        comboBox_5.addItem("comboBox_5 val 1");
        comboBox_5.addItem("comboBox_5 val 2");

        comboBox_6 = new JComboBox();
        GridBagConstraints gbc_comboBox_6 = new GridBagConstraints();
        gbc_comboBox_6.insets = new Insets(0, 0, 5, 5);
        gbc_comboBox_6.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_6.gridx = 0;
        gbc_comboBox_6.gridy = 3;
        contentPane.add(comboBox_6, gbc_comboBox_6);

        comboBox_6.addItem("comboBox_6 val 1");
        comboBox_6.addItem("comboBox_6 val 2");

        comboBox_7 = new JComboBox();
        GridBagConstraints gbc_comboBox_7 = new GridBagConstraints();
        gbc_comboBox_7.insets = new Insets(0, 0, 5, 0);
        gbc_comboBox_7.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_7.gridx = 1;
        gbc_comboBox_7.gridy = 3;
        contentPane.add(comboBox_7, gbc_comboBox_7);

        comboBox_7.addItem("comboBox_7 val 1");
        comboBox_7.addItem("comboBox_7 val 2");

        comboBox_8 = new JComboBox();
        GridBagConstraints gbc_comboBox_8 = new GridBagConstraints();
        gbc_comboBox_8.insets = new Insets(0, 0, 5, 5);
        gbc_comboBox_8.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_8.gridx = 0;
        gbc_comboBox_8.gridy = 4;
        contentPane.add(comboBox_8, gbc_comboBox_8);

        comboBox_8.addItem("comboBox_8 val 1");
        comboBox_8.addItem("comboBox_8 val 2");

        comboBox_9 = new JComboBox();
        GridBagConstraints gbc_comboBox_9 = new GridBagConstraints();
        gbc_comboBox_9.insets = new Insets(0, 0, 5, 0);
        gbc_comboBox_9.fill = GridBagConstraints.HORIZONTAL;
        gbc_comboBox_9.gridx = 1;
        gbc_comboBox_9.gridy = 4;
        contentPane.add(comboBox_9, gbc_comboBox_9);

        comboBox_9.addItem("comboBox_9 val 1");
        comboBox_9.addItem("comboBox_9 val 2");

        JButton btnGetValues = new JButton("Get Values");
        GridBagConstraints gbc_btnGetValues = new GridBagConstraints();
        gbc_btnGetValues.insets = new Insets(0, 0, 5, 0);
        gbc_btnGetValues.gridx = 1;
        gbc_btnGetValues.gridy = 5;
        contentPane.add(btnGetValues, gbc_btnGetValues);

        textArea = new JTextArea();
        GridBagConstraints gbc_lblNewLabel = new GridBagConstraints();
        gbc_lblNewLabel.gridheight = 2;
        gbc_lblNewLabel.gridwidth = 2;
        gbc_lblNewLabel.insets = new Insets(0, 0, 5, 0);
        gbc_lblNewLabel.gridx = 0;
        gbc_lblNewLabel.gridy = 6;
        contentPane.add(textArea, gbc_lblNewLabel);
        textArea.setColumns(30);
        textArea.setRows(5);



        pack();

        btnGetValues.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                textArea.setText(comboBox.getSelectedItem().toString()+","+
                        comboBox_1.getSelectedItem().toString()+","+
                        comboBox_2.getSelectedItem().toString()+"\n"+
                        comboBox_3.getSelectedItem().toString()+","+
                        comboBox_4.getSelectedItem().toString()+","+
                        comboBox_5.getSelectedItem().toString()+"\n"+
                        comboBox_6.getSelectedItem().toString()+","+
                        comboBox_7.getSelectedItem().toString()+","+
                        comboBox_8.getSelectedItem().toString()+"\n"+
                        comboBox_9.getSelectedItem().toString());
            }
        });
    }

}

使用带有按钮的组合框值

3 个答案: