Question

在我的计划中，它有两个JButton，其名称为Start和Reset to 0，一个JTextField和一个JLabel。当我点击Start JButton次时，它会在JTextField显示结果。

如果计数数字等于1，则显示消息Start in JLabel，当计数大于1时，显示Reset to 0 in JLabel。但问题是当我点击Reset to 0 JButton时它重置为1但是没有显示消息Reset to 0 in JLabel？

计划在这里：

import java.awt.EventQueue;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.LayoutStyle.ComponentPlacement;
import com.alee.laf.rootpane.WebFrame;
import java.awt.Font;
import javax.swing.SwingConstants;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JLabel;

public class Search {

    private WebFrame frame;
    private JTextField textField;
    private JButton btnResetTo;
    private JButton btnNewButton;
    private int count;
    private JLabel lblNewLabel;
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Search window = new Search();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public Search() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new WebFrame();
        frame.setBounds(100, 100, 296, 374);
        frame.setDefaultCloseOperation(WebFrame.EXIT_ON_CLOSE);

        btnNewButton = new JButton("Start");
        btnNewButton.addMouseListener(new MouseAdapter() {
            private int Qnty;
            @Override
            public void mouseClicked(MouseEvent e) {
                count=e.getClickCount();
                textField.setText(Integer.toString(count));
                Qnty=Qnty+count;
                if(Qnty==1)
                    lblNewLabel.setText("Start");
                else if(Qnty>1)
                {
                    lblNewLabel.setText("Reset");
                }
            }
        });

        textField = new JTextField();
        textField.setFont(new Font("Tahoma", Font.BOLD, 40));
        textField.setHorizontalAlignment(SwingConstants.CENTER);
        textField.setColumns(10);

        btnResetTo = new JButton("Reset to 0");
        btnResetTo.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                count=e.getClickCount();
                count=0;
            }
        });

        lblNewLabel = new JLabel("");
        lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
        lblNewLabel.setFont(new Font("Tahoma", Font.BOLD, 15));

        GroupLayout groupLayout = new GroupLayout(frame.getContentPane());
        groupLayout.setHorizontalGroup(
            groupLayout.createParallelGroup(Alignment.LEADING)
                .addGroup(Alignment.TRAILING, groupLayout.createSequentialGroup()
                    .addContainerGap()
                    .addGroup(groupLayout.createParallelGroup(Alignment.TRAILING)
                        .addComponent(lblNewLabel, Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 260, Short.MAX_VALUE)
                        .addGroup(Alignment.LEADING, groupLayout.createSequentialGroup()
                            .addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 88, GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(ComponentPlacement.RELATED, 36, Short.MAX_VALUE)
                            .addComponent(btnResetTo, GroupLayout.PREFERRED_SIZE, 136, GroupLayout.PREFERRED_SIZE))
                        .addComponent(textField, Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 260, Short.MAX_VALUE))
                    .addContainerGap())
        );
        groupLayout.setVerticalGroup(
            groupLayout.createParallelGroup(Alignment.LEADING)
                .addGroup(groupLayout.createSequentialGroup()
                    .addGap(25)
                    .addGroup(groupLayout.createParallelGroup(Alignment.LEADING, false)
                        .addComponent(btnResetTo, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(btnNewButton, GroupLayout.DEFAULT_SIZE, 87, Short.MAX_VALUE))
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addComponent(textField, GroupLayout.PREFERRED_SIZE, 69, GroupLayout.PREFERRED_SIZE)
                    .addGap(31)
                    .addComponent(lblNewLabel, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
                    .addGap(73))
        );

        frame.getContentPane().setLayout(groupLayout);
    }
}

Answer 1

在按钮上使用ActionListener代替MouseListener - 可以通过多种方式触发按钮，然后只需点击它们即可。有关详细信息，请参阅std::pair和How to Use Buttons, Check Boxes, and Radio Buttons
调用重置时，实际上需要更改组件，就像使用btnNew一样 - 变量没有神奇地链接到组件

也许喜欢

btnResetTo = new JButton("Reset to 0");
btnResetTo.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        count = 0;
        textField.setText(Integer.toString(count));
        lblNewLabel.setText("Start");
    }
});

计数器重置不适用于Java

1 个答案: