java计算器gui
时间: 2024-07-04 08:01:13 浏览: 45
Java中的图形用户界面(GUI)计算器是一个常见的编程练习,它使用Java Swing或JavaFX库来创建一个交互式的计算器应用程序。以下是一个简单的步骤概述:
1. 引入库:首先,你需要导入Swing或JavaFX库,例如`javax.swing.*` 或 `javafx.scene.*`。
2. 创建窗口:创建一个新的`JFrame`或`Stage`作为计算器的主界面,设置窗口大小、标题等属性。
3. 布局组件:使用`GridLayout`或`BorderLayout`等布局管理器,添加数字键、运算符按钮和可能的一个结果显示区域(如`JTextField`)。
4. 处理事件:为每个按钮添加监听器,当用户点击按钮时,会触发相应的事件处理器,根据按钮上的文本执行计算操作。
5. 实现计算逻辑:编写一个方法来处理用户输入,比如解析表达式、进行计算并更新结果显示区域。
6. 错误处理:确保捕捉用户输入错误(如除数为零),提供友好的错误提示。
7. 可视化效果:可选择添加动画效果、皮肤样式等,提升用户体验。
相关问题
JAVA 计算器GUI
Java计算器GUI是一个基于图形用户界面的计算器应用程序,可以用来执行各种数学运算,包括加、减、乘、除、求平方根、求倒数等。
以下是一个简单的Java计算器GUI的示例代码:
```java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CalculatorGUI extends JFrame implements ActionListener {
private JTextField tfResult;
private JButton[] btnNumbers;
private JButton[] btnOps;
private JButton btnEquals;
private JButton btnClear;
private String op = "";
private double num1 = 0;
private double num2 = 0;
public CalculatorGUI() {
setTitle("Calculator");
setSize(300, 300);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(4, 4, 5, 5));
tfResult = new JTextField();
tfResult.setEditable(false);
panel.add(tfResult);
btnNumbers = new JButton[10];
for (int i = 0; i < btnNumbers.length; i++) {
btnNumbers[i] = new JButton("" + i);
btnNumbers[i].addActionListener(this);
panel.add(btnNumbers[i]);
}
btnOps = new JButton[4];
btnOps[0] = new JButton("+");
btnOps[1] = new JButton("-");
btnOps[2] = new JButton("*");
btnOps[3] = new JButton("/");
for (int i = 0; i < btnOps.length; i++) {
btnOps[i].addActionListener(this);
panel.add(btnOps[i]);
}
btnEquals = new JButton("=");
btnEquals.addActionListener(this);
panel.add(btnEquals);
btnClear = new JButton("C");
btnClear.addActionListener(this);
panel.add(btnClear);
add(panel);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (command.equals("+") || command.equals("-") || command.equals("*") || command.equals("/")) {
op = command;
num1 = Double.parseDouble(tfResult.getText());
tfResult.setText("");
} else if (command.equals("=")) {
num2 = Double.parseDouble(tfResult.getText());
if (op.equals("+")) {
tfResult.setText(String.valueOf(num1 + num2));
} else if (op.equals("-")) {
tfResult.setText(String.valueOf(num1 - num2));
} else if (op.equals("*")) {
tfResult.setText(String.valueOf(num1 * num2));
} else if (op.equals("/")) {
tfResult.setText(String.valueOf(num1 / num2));
}
} else if (command.equals("C")) {
op = "";
num1 = 0;
num2 = 0;
tfResult.setText("");
} else {
tfResult.setText(tfResult.getText() + command);
}
}
public static void main(String[] args) {
new CalculatorGUI();
}
}
```
这个计算器GUI应用程序使用了Java的Swing库来构建用户界面,包括文本框、数字按钮、运算符按钮、等号按钮和清除按钮。当用户点击数字按钮时,它们的值将显示在文本框中。当用户点击运算符按钮时,程序将记录运算符和第一个操作数的值。当用户点击等号按钮时,程序将计算第二个操作数的值,并将结果显示在文本框中。当用户点击清除按钮时,程序将清除所有值并重新开始。
该程序使用了基本的数学运算符:加、减、乘、除。如果需要更多的数学运算符或功能,可以添加更多的按钮和相应的操作代码。
java计算器程序代码gui
以下是一个简单的Java计算器GUI程序代码,它可以通过按钮事件和键盘事件进行运算:
```java
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener, KeyListener {
private JTextField display;
private JButton[] buttons;
private String[] labels = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+"};
private int[] widths = {100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 200, 100, 100, 100};
private int[] heights = {100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100};
private double result = 0;
private String operator = "=";
private boolean startOfNumber = true;
public Calculator() {
super("Calculator");
display = new JTextField("", 12);
display.setHorizontalAlignment(JTextField.RIGHT);
display.setEditable(false);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));
buttons = new JButton[16];
for (int i = 0; i < 16; i++) {
buttons[i] = new JButton(labels[i]);
buttons[i].addActionListener(this);
buttons[i].addKeyListener(this);
buttons[i].setPreferredSize(new Dimension(widths[i], heights[i]));
panel.add(buttons[i]);
}
getContentPane().add(display, BorderLayout.NORTH);
getContentPane().add(panel, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (command.charAt(0) >= '0' && command.charAt(0) <= '9' || command.equals(".")) {
if (startOfNumber == true) {
display.setText(command);
} else {
display.setText(display.getText() + command);
}
startOfNumber = false;
} else {
if (startOfNumber) {
if (command.equals("-")) {
display.setText(command);
startOfNumber = false;
} else {
operator = command;
}
} else {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = command;
startOfNumber = true;
}
}
}
public void keyTyped(KeyEvent e) {
char keyChar = e.getKeyChar();
if (keyChar >= '0' && keyChar <= '9' || keyChar == '.') {
if (startOfNumber == true) {
display.setText("" + keyChar);
} else {
display.setText(display.getText() + keyChar);
}
startOfNumber = false;
} else if (keyChar == '+' || keyChar == '-' || keyChar == '*' || keyChar == '/') {
if (startOfNumber) {
if (keyChar == '-') {
display.setText("" + keyChar);
startOfNumber = false;
} else {
operator = "" + keyChar;
}
} else {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = "" + keyChar;
startOfNumber = true;
}
} else if (keyChar == '\n') {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = "=";
startOfNumber = true;
} else if (keyChar == '\b') {
String text = display.getText();
if (text.length() > 0) {
text = text.substring(0, text.length() - 1);
if (text.length() == 0) {
display.setText("");
startOfNumber = true;
} else {
display.setText(text);
startOfNumber = false;
}
}
}
}
public void keyPressed(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
private void calculate(double n) {
if (operator.equals("+")) {
result += n;
} else if (operator.equals("-")) {
result -= n;
} else if (operator.equals("*")) {
result *= n;
} else if (operator.equals("/")) {
result /= n;
} else if (operator.equals("=")) {
result = n;
}
display.setText("" + result);
}
public static void main(String[] args) {
Calculator calculator = new Calculator();
}
}
```
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