你好这是我的计算器错误的替代帖子，用java，用户＆＃34; Hovercraft Full Of Eels＆＃34;我不想给您带来不便请弃这个帖子。我将发布带有错误的代码。问题代码是这部分写在这里。再次感谢任何愿意帮助的人，并希望一旦它起作用，它将帮助其他人开始。建设性批评欢迎编写代码的方式。
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine engine = mgr.getEngineByName("JavaScript");
String tarea = textarea.getText();
double display = (double) engine.eval(tarea);
String display2 = String.valueOf(display);
textarea.setText(display2);
双倍的错误读取........
"unreported exception ScriptException; must be caught or declared to be thrown
......"
当我运行计算器时，我得到了这些错误......
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Uncompilable source code - unreported exception javax.script.ScriptException; must be caught or declared to be thrown
at my.harrycalc.HarryCalc.equalsActionPerformed(HarryCalc.java:337)
at my.harrycalc.HarryCalc.access$1300(HarryCalc.java:17)
at my.harrycalc.HarryCalc$14.actionPerformed(HarryCalc.java:150)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:308)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
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:4687)
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)
以下是整个应用程序代码....
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package my.harrycalc;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
/**
*
* @author William Lane
*/
public class HarryCalc extends javax.swing.JFrame {
/**
* Creates new form HarryCalc
*/
public HarryCalc() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jToggleButton1 = new javax.swing.JToggleButton();
textarea = new javax.swing.JTextField();
one = new javax.swing.JToggleButton();
two = new javax.swing.JToggleButton();
three = new javax.swing.JToggleButton();
four = new javax.swing.JToggleButton();
five = new javax.swing.JToggleButton();
nine = new javax.swing.JToggleButton();
eight = new javax.swing.JToggleButton();
seven = new javax.swing.JToggleButton();
six = new javax.swing.JToggleButton();
zero = new javax.swing.JToggleButton();
times = new javax.swing.JToggleButton();
divide = new javax.swing.JToggleButton();
equals = new javax.swing.JToggleButton();
minus = new javax.swing.JToggleButton();
plus = new javax.swing.JToggleButton();
about = new javax.swing.JToggleButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jToggleButton1.setText("Close");
jToggleButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jToggleButton1ActionPerformed(evt);
}
});
one.setText("1");
one.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
oneActionPerformed(evt);
}
});
two.setText("2");
two.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
twoActionPerformed(evt);
}
});
three.setText("3");
three.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
threeActionPerformed(evt);
}
});
four.setText("4");
four.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
fourActionPerformed(evt);
}
});
five.setText("5");
five.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
fiveActionPerformed(evt);
}
});
nine.setText("9");
nine.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
nineActionPerformed(evt);
}
});
eight.setText("8");
eight.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
eightActionPerformed(evt);
}
});
seven.setText("7");
seven.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
sevenActionPerformed(evt);
}
});
six.setText("6");
six.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
sixActionPerformed(evt);
}
});
zero.setText("0");
zero.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
zeroActionPerformed(evt);
}
});
times.setText("*");
times.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
timesActionPerformed(evt);
}
});
divide.setText("/");
divide.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
divideActionPerformed(evt);
}
});
equals.setText("=");
equals.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
equalsActionPerformed(evt);
}
});
equals.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
equalsKeyReleased(evt);
}
});
minus.setText("-");
minus.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
minusActionPerformed(evt);
}
});
plus.setText("+");
plus.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
plusActionPerformed(evt);
}
});
about.setText("About");
about.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
aboutActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(one, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(two, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(three, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(four, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(five, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(six)
.addComponent(seven)
.addComponent(eight)
.addComponent(nine)
.addComponent(zero))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(plus, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(equals, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(divide, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(times, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(minus, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(about)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jToggleButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGap(0, 0, Short.MAX_VALUE))
.addComponent(textarea))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(textarea, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(one)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(two)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(three)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(four)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(five))
.addGroup(layout.createSequentialGroup()
.addComponent(six)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(seven)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(eight)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(nine)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(zero))
.addGroup(layout.createSequentialGroup()
.addComponent(plus)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(minus)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(times)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(divide)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(equals)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jToggleButton1)
.addComponent(about))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jToggleButton1ActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
}
private void aboutActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void oneActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "1");
}
private void twoActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "2");
}
private void threeActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "3");
}
private void fourActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "4");
}
private void fiveActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "5");
}
private void sixActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "6");
}
private void sevenActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "7");
}
private void eightActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "8");
}
private void nineActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "9");
}
private void zeroActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "0");
}
private void plusActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "+");
}
private void minusActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "-");
}
private void timesActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "*");
}
private void divideActionPerformed(java.awt.event.ActionEvent evt) {
textarea.setText(textarea.getText() + "/");
}
private void equalsActionPerformed(java.awt.event.ActionEvent evt) {
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine engine = mgr.getEngineByName("JavaScript");
String tarea = textarea.getText();
double display = (double) engine.eval(tarea);
String display2 = String.valueOf(display);
textarea.setText(display2);
}
private void equalsKeyReleased(java.awt.event.KeyEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(HarryCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(HarryCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(HarryCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(HarryCalc.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new HarryCalc().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JToggleButton about;
private javax.swing.JToggleButton divide;
private javax.swing.JToggleButton eight;
private javax.swing.JToggleButton equals;
private javax.swing.JToggleButton five;
private javax.swing.JToggleButton four;
private javax.swing.JToggleButton jToggleButton1;
private javax.swing.JToggleButton minus;
private javax.swing.JToggleButton nine;
private javax.swing.JToggleButton one;
private javax.swing.JToggleButton plus;
private javax.swing.JToggleButton seven;
private javax.swing.JToggleButton six;
private javax.swing.JTextField textarea;
private javax.swing.JToggleButton three;
private javax.swing.JToggleButton times;
private javax.swing.JToggleButton two;
private javax.swing.JToggleButton zero;
// End of variables declaration
}
答案 0 :(得分：1)
ScriptEngine::eval可以抛出ScriptException。导致错误的行是double display = (double) engine.eval(tarea);。您需要将该行换行try-catch并处理Exception。