package calculator;
import java.awt.*;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Arrays;
import java.util.Collections;
import java.util.Vector;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import com.jgoodies.forms.factories.DefaultComponentFactory;
public class CalculatorWindow {
private JFrame frame;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
CalculatorWindow window = new CalculatorWindow();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public CalculatorWindow() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.getContentPane().setBackground(Color.LIGHT_GRAY);
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
final JLabel outputBox = new JLabel("");
outputBox.setBackground(Color.WHITE);
outputBox.setForeground(Color.WHITE);
outputBox.setBounds(12, 39, 424, 112);
frame.getContentPane().add(outputBox);
JButton one = new JButton("1");
one.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "1");
}
});
one.setBounds(12, 163, 55, 25);
frame.getContentPane().add(one);
JButton two = new JButton("2");
two.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "2");
}
});
two.setBounds(77, 163, 55, 25);
frame.getContentPane().add(two);
JButton three = new JButton("3");
three.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "3");
}
});
three.setBounds(144, 163, 55, 25);
frame.getContentPane().add(three);
JButton four = new JButton("4");
four.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "4");
}
});
four.setBounds(12, 200, 55, 25);
frame.getContentPane().add(four);
JButton five = new JButton("5");
five.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "5");
}
});
five.setBounds(77, 200, 55, 25);
frame.getContentPane().add(five);
JButton six = new JButton("6");
six.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "6");
}
});
six.setBounds(144, 200, 55, 25);
frame.getContentPane().add(six);
JButton seven = new JButton("7");
seven.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "7");
}
});
seven.setBounds(12, 237, 55, 25);
frame.getContentPane().add(seven);
JButton eight = new JButton("8");
eight.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "8");
}
});
eight.setBounds(77, 237, 55, 25);
frame.getContentPane().add(eight);
JButton nine = new JButton("9");
nine.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "9");
}
});
nine.setBounds(144, 237, 55, 25);
frame.getContentPane().add(nine);
JButton zero = new JButton("0");
zero.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + "0");
}
});
zero.setBounds(207, 237, 55, 25);
frame.getContentPane().add(zero);
JButton add = new JButton("+");
add.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + " + ");
}
});
add.setBounds(207, 200, 55, 25);
frame.getContentPane().add(add);
JButton subtract = new JButton("-");
subtract.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + " - ");
}
});
subtract.setBounds(207, 163, 55, 25);
frame.getContentPane().add(subtract);
JButton multiply = new JButton("x");
multiply.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + " x ");
}
});
multiply.setBounds(274, 163, 55, 25);
frame.getContentPane().add(multiply);
JButton divide = new JButton("÷");
divide.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
outputBox.setText(outputBox.getText() + " ÷ ");
}
});
divide.setBounds(274, 200, 55, 25);
frame.getContentPane().add(divide);
JButton equals = new JButton("=");
equals.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String[] outputBoxButtonsPressed = outputBox.getText().split(
" ");
int answer;
for (int buttonPressed = 0; buttonPressed < outputBoxButtonsPressed.length; buttonPressed++) {
if (outputBoxButtonsPressed[buttonPressed + 1].equals("+")) {
answer = Integer
.parseInt(outputBoxButtonsPressed[buttonPressed])
+ Integer
.parseInt(outputBoxButtonsPressed[buttonPressed + 2]);
break;
}
}
}
});
equals.setBounds(274, 237, 55, 25);
frame.getContentPane().add(equals);
JLabel lbTitle = DefaultComponentFactory.getInstance().createTitle(
"Calculator - Coded by William Bryant (gogobebe2)");
lbTitle.setFont(new Font("Andale Mono", Font.BOLD, 12));
lbTitle.setBounds(12, 12, 424, 15);
frame.getContentPane().add(lbTitle);
JLabel img = new JLabel("");
Image theImage = new ImageIcon(this.getClass().getResource(
"/calculatorIcon.png")).getImage();
img.setIcon(new ImageIcon(theImage));
img.setBounds(336, 163, 100, 106);
frame.getContentPane().add(img);
}
}
我认为这是 for 循环中 equals 按钮处理程序的 if 语句中的内容 这会导致错误。
这是当我按下按钮“3”、“3”、“+”、“6”、“6”(在计算器输出框中看起来为 33 + 66)时出现的错误消息:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 3
at calculator.CalculatorWindow$16.actionPerformed(CalculatorWindow.java:198)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6516)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6281)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4872)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
非常感谢任何帮助。我是 swing、awt 和 java 的新手。
最佳答案
这个循环有问题:
for (int buttonPressed = 0; buttonPressed < outputBoxButtonsPressed.length; buttonPressed++) {
if (outputBoxButtonsPressed[buttonPressed + 1].equals("+")) {
answer = Integer
.parseInt(outputBoxButtonsPressed[buttonPressed])
+ Integer
.parseInt(outputBoxButtonsPressed[buttonPressed + 2]); //here
break;
}
}
具体来说，当 buttonPressed 时，注释行上会发生错误。 > = outputBoxButtonsPressed.length - 2因为您要访问数组最多超出其结束位置的两个元素。您可以通过将循环条件更改为buttonPressed < outputBoxButtonsPressed.length - 2来防止错误。 ，但我不会起诉这是否会阻止您的代码工作。
关于java - 我的 Java Swing Designer 计算器无法运行。 (循环的等于按钮按下时会出错)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27073828/