用模态的方式打开自定义JDialog，并获取返回值

JFrame的变量名为jf

JDialog的类名为Fff

btnLoadImage.addMouseListener(new MouseAdapter() {@Overridepublic void mouseClicked(MouseEvent e) {Fff myff = new Fff();//myff.setModal(false);myff.setModalityType(ModalityType.APPLICATION_MODAL);myff.setVisible(true);//如果是点击确定，则文本框中输入的内容显示出来String strText;int iReturn;iReturn = myff.f_GetCoseType();if (iReturn == 0) {lbImage.setText("选择了取消");}else{strText = myff.f_GetText();lbImage.setText(strText);}}});

Fff的类

package bb;import java.awt.BorderLayout;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.JTextField;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;/** * @author 作者 E-mail: * @version 创建时间：Sep 18, 2017 2:48:29 PM * 类说明 */public class Fff extends JDialog {private final JPanel contentPanel = new JPanel();private JTextField textOut;private int iCloseType; //点击确定，该值为1，点击取消，该值为0/** * Launch the application. */public static void main(String[] args) {try {Fff dialog = new Fff();dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);dialog.setVisible(true);} catch (Exception e) {e.printStackTrace();}}/** * Create the dialog. */public Fff() {iCloseType = 0 ;//默认是点击取消按钮setBounds(100, 100, 450, 300);getContentPane().setLayout(new BorderLayout());contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));getContentPane().add(contentPanel, BorderLayout.CENTER);contentPanel.setLayout(new BorderLayout(0, 0));{JPanel panel = new JPanel();contentPanel.add(panel);panel.setLayout(new BorderLayout(0, 0));{textOut = new JTextField();panel.add(textOut, BorderLayout.NORTH);textOut.setColumns(10);}}{JPanel buttonPane = new JPanel();buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));getContentPane().add(buttonPane, BorderLayout.SOUTH);{JButton okButton = new JButton("OK");okButton.addMouseListener(new MouseAdapter() {@Overridepublic void mouseClicked(MouseEvent e) {//检查用户是否输入了内容if(f_chkInput()) {iCloseType = 1;//点击了确定性按钮dispose();}}});okButton.setActionCommand("OK");buttonPane.add(okButton);getRootPane().setDefaultButton(okButton);}{JButton cancelButton = new JButton("Cancel");cancelButton.addMouseListener(new MouseAdapter() {@Overridepublic void mouseClicked(MouseEvent e) {iCloseType = 0;//点击了取消按钮dispose();}});cancelButton.setActionCommand("Cancel");buttonPane.add(cancelButton);}}}//检查用户是否输入了文本public boolean f_chkInput() { String strText; boolean bRet;strText = textOut.getText();if ( strText.length()==0 || strText==null) {JOptionPane jMsg = new JOptionPane();jMsg.showMessageDialog(null, "请输入内容");bRet = false;}else{bRet = true;}return bRet;}public int f_GetCoseType() {return iCloseType;}public String f_GetText() {String strOut;strOut = textOut.getText();return strOut;}}