我刚刚在 NetBytes 中创建了一个基本的计算器项目，当我在那里运行该项目时，代码工作正常，当我转到 Docs>NetBeans projects>dist>calculator.jar 并在那里运行它时它可以工作，但是当我将其拖到桌面并尝试在那里运行它时，JFrame 将无法打开
这是下面唯一的类：
package calculator;
/**
*
* @author David
*/
public class ui extends javax.swing.JFrame {
/**
* Creates new form ui
*/
public ui() {
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() {
buttonGroup1 = new javax.swing.ButtonGroup();
jScrollBar1 = new javax.swing.JScrollBar();
jLabel1 = new javax.swing.JLabel();
addBut = new javax.swing.JRadioButton();
subBut = new javax.swing.JRadioButton();
mulBut = new javax.swing.JRadioButton();
divBut = new javax.swing.JRadioButton();
intOneText = new javax.swing.JTextField();
intTwoText = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
result = new javax.swing.JLabel();
goButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout()); // error here
jLabel1.setText("Calculator");
getContentPane().add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(110, 60, -1, -1));
buttonGroup1.add(addBut);
addBut.setText("Add");
getContentPane().add(addBut, new org.netbeans.lib.awtextra.AbsoluteConstraints(200, 110, -1, -1));
buttonGroup1.add(subBut);
subBut.setText("Subtract");
getContentPane().add(subBut, new org.netbeans.lib.awtextra.AbsoluteConstraints(260, 110, -1, -1));
buttonGroup1.add(mulBut);
mulBut.setText("Multiply");
getContentPane().add(mulBut, new org.netbeans.lib.awtextra.AbsoluteConstraints(200, 140, -1, -1));
buttonGroup1.add(divBut);
divBut.setText("Divide");
getContentPane().add(divBut, new org.netbeans.lib.awtextra.AbsoluteConstraints(280, 140, -1, -1));
getContentPane().add(intOneText, new org.netbeans.lib.awtextra.AbsoluteConstraints(89, 131, 83, -1));
getContentPane().add(intTwoText, new org.netbeans.lib.awtextra.AbsoluteConstraints(90, 180, 83, -1));
jLabel2.setText("Integer 1:");
getContentPane().add(jLabel2, new org.netbeans.lib.awtextra.AbsoluteConstraints(20, 134, -1, -1));
jLabel3.setText("Integer 2:");
getContentPane().add(jLabel3, new org.netbeans.lib.awtextra.AbsoluteConstraints(20, 180, -1, -1));
result.setText("Solution Will Appear Here");
getContentPane().add(result, new org.netbeans.lib.awtextra.AbsoluteConstraints(180, 220, -1, -1));
goButton.setText("Calculate");
goButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
goButtonMouseClicked(evt);
}
});
getContentPane().add(goButton, new org.netbeans.lib.awtextra.AbsoluteConstraints(59, 218, -1, -1));
pack();
}// </editor-fold>
private void goButtonMouseClicked(java.awt.event.MouseEvent evt) {
if(intOneText.getText().equals("")){
result.setText("Something is missing here...");
}
if(intTwoText.getText().equals("")){
result.setText("Something is missing here...");
}
String intOne = intOneText.getText();
float numOne = Float.parseFloat(intOne);
String intTwo = intTwoText.getText();
float numTwo = Float.parseFloat(intTwo);
float answer = 0;
boolean addTrue = false;
boolean subTrue = false;
boolean mulTrue = false;
boolean divTrue = false;
if(addBut.isSelected()){
addTrue = true;
subTrue = false;
mulTrue = false;
divTrue = false;
}
if(subBut.isSelected()){
addTrue = false;
subTrue = true;
mulTrue = false;
divTrue = false;
}
if(mulBut.isSelected()){
addTrue = false;
subTrue = false;
mulTrue = true;
divTrue = false;
}
if(divBut.isSelected()){
addTrue = false;
subTrue = false;
mulTrue = false;
divTrue = true;
}
if(addTrue == false){
if(subTrue == false){
if(mulTrue == false){
if(divTrue == false){
result.setText("Something is missing here...");
}
}
}
}
if(addTrue == true){
answer = numOne + numTwo;
}
if(subTrue == true){
answer = numOne - numTwo;
}
if(mulTrue == true){
answer = numOne * numTwo;
}
if(divTrue == true){
answer = numOne / numTwo;
}
result.setText(Float.toString(answer));
}
/**
* @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(ui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ui.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 ui().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JRadioButton addBut;
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.JRadioButton divBut;
private javax.swing.JButton goButton;
private javax.swing.JTextField intOneText;
private javax.swing.JTextField intTwoText;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JScrollBar jScrollBar1;
private javax.swing.JRadioButton mulBut;
private javax.swing.JLabel result;
private javax.swing.JRadioButton subBut;
// End of variables declaration
}
我在命令行中遇到的错误是：
线程"AWT-EventQueue-0"java 中的异常。Lang.NoClassDefFoundError： org/netbeans/lib/awtExtra/AbsoluteLayout
在第 44 行...（以上评论）
您是否正在尝试双击 JAR 文件？ 因为那行不通。
您必须打开一个cmd并键入：Java -jar 计算器.jar
我认为它区分大小写，所以计算器。JAR 将不起作用。 您需要.jar扩展。
有一种方法可以通过双击使其可执行，但这需要额外的步骤。
祝你好运！