NumericKeypad
时间: 2024-06-05 12:06:45 浏览: 4
Numeric keypad is a set of keys on a keyboard that are arranged in a rectangular shape and are used primarily for entering numbers and mathematical symbols. The numeric keypad typically contains the numbers 0-9, a decimal point, and mathematical symbols such as plus, minus, multiply, and divide. It is commonly used in tasks that require frequent numerical data entry, such as accounting, data analysis, and scientific calculations. The numeric keypad is often found on the right side of a standard computer keyboard, but it can also be a separate device that connects to a computer via USB or Bluetooth.
相关问题
使用swing写一个纯数字的小键盘
好的,以下是一个使用Swing写的纯数字小键盘的示例代码:
```java
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class NumericKeypad extends JFrame {
private JTextField textField;
public NumericKeypad() {
setTitle("Numeric Keypad");
setSize(300, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 创建文本框
textField = new JTextField();
textField.setEditable(false);
add(textField, "North");
// 创建按钮面板
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(4, 3));
// 创建按钮
for (int i = 1; i <= 9; i++) {
JButton button = new JButton(String.valueOf(i));
button.addActionListener(e -> {
textField.setText(textField.getText() + button.getText());
});
buttonPanel.add(button);
}
JButton button0 = new JButton("0");
button0.addActionListener(e -> {
textField.setText(textField.getText() + button0.getText());
});
buttonPanel.add(button0);
JButton clearButton = new JButton("Clear");
clearButton.addActionListener(e -> {
textField.setText("");
});
buttonPanel.add(clearButton);
add(buttonPanel);
}
public static void main(String[] args) {
NumericKeypad keypad = new NumericKeypad();
keypad.setVisible(true);
}
}
```
该程序创建了一个窗口,其中包含一个文本框和一个纯数字的小键盘。用户可以通过单击按钮将数字添加到文本框中,并且可以使用“Clear”按钮清除文本框中的内容。
编译并运行该程序,可以看到一个纯数字的小键盘。
使用swing生成一个纯数字的小键盘
以下是一个使用 Swing 生成纯数字小键盘的示例代码:
```java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class NumericKeypad extends JFrame implements ActionListener {
private JTextField textField;
public NumericKeypad() {
// 设置窗口基本属性
setTitle("Numeric Keypad");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(200, 300);
setLocationRelativeTo(null);
setResizable(false);
// 创建文本框并添加到窗口中
textField = new JTextField();
textField.setHorizontalAlignment(JTextField.RIGHT);
add(textField, BorderLayout.NORTH);
// 创建面板并添加到窗口中
JPanel panel = new JPanel(new GridLayout(4, 3, 5, 5));
add(panel, BorderLayout.CENTER);
// 创建数字按钮并添加到面板中
for (int i = 1; i <= 9; i++) {
JButton button = new JButton(String.valueOf(i));
button.addActionListener(this);
panel.add(button);
}
// 创建清除按钮并添加到面板中
JButton clearButton = new JButton("C");
clearButton.addActionListener(this);
panel.add(clearButton);
// 创建 0 按钮并添加到面板中
JButton zeroButton = new JButton("0");
zeroButton.addActionListener(this);
panel.add(zeroButton);
// 创建删除按钮并添加到面板中
JButton deleteButton = new JButton("<-");
deleteButton.addActionListener(this);
panel.add(deleteButton);
// 显示窗口
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
switch (command) {
case "C":
textField.setText("");
break;
case "<-":
String text = textField.getText();
if (text.length() > 0) {
textField.setText(text.substring(0, text.length() - 1));
}
break;
default:
textField.setText(textField.getText() + command);
break;
}
}
public static void main(String[] args) {
new NumericKeypad();
}
}
```
运行该程序可以生成一个简单的纯数字小键盘窗口。用户可以通过点击数字按钮输入数字,点击清除按钮清空文本框内容,点击删除按钮删除最后一个输入的数字。