Java 使用jfilechooser选择文件挂起程序
我想从包含矩阵的硬盘中选择一个文件……我想将其保存在2d数组中……但每当我选择该文件时,我的应用程序就会挂起,我无法按任何其他按钮 这是我的样本:Java 使用jfilechooser选择文件挂起程序,java,jfilechooser,Java,Jfilechooser,我想从包含矩阵的硬盘中选择一个文件……我想将其保存在2d数组中……但每当我选择该文件时,我的应用程序就会挂起,我无法按任何其他按钮 这是我的样本: public class Flood extends javax.swing.JFrame { /** * Creates new form NewJFrame */ public static int[][] multi; public Flood() { initComponents(); browseB.addAction
public class Flood extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public static int[][] multi;
public Flood() {
initComponents();
browseB.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
JFileChooser fc = new JFileChooser();
switch (fc.showOpenDialog(null)) {
case JFileChooser.APPROVE_OPTION:
File file = fc.getSelectedFile();
Scanner input = null;
try {
input = new Scanner(file);
} catch (FileNotFoundException ex) {
Logger.getLogger(Flood.class.getName()).log(Level.SEVERE, null, ex);
}
int row = 0;
int col = 0;
while (input.hasNextLine()) {
++row;
Scanner colReader = new Scanner(input.nextLine());
while (colReader.hasNextInt()) {
++col;
}
}
multi = new int[row][col];
input.close();
{
try {
input = new Scanner(file);
} catch (FileNotFoundException ex) {
Logger.getLogger(Flood.class.getName()).log(Level.SEVERE, null, ex);
}
}
for (int i = 0; i < row; ++i) {
for (int j = 0; j < col; ++j) {
if (input.hasNextInt()) {
multi[i][j] = input.nextInt();
}
}
}
break;
}
}
});
jButton1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
for(int i=0;i<multi.length;i++)
{
for(int j=0;j<multi[0].length;j++)
{
System.out.println(""+multi[i][j]);
}
}
}
});
}
/**
* 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() {
jPanel1 = new javax.swing.JPanel();
browseTF = new javax.swing.JTextField();
browseB = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
browseB.setText("Browse");
browseB.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
browseBActionPerformed(evt);
}
});
jLabel1.setText("number of 0 :-");
jLabel2.setText("0");
jLabel3.setText("number of 1 :-");
jLabel4.setText("0");
jButton1.setText("go");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(42, 42, 42)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(browseTF, javax.swing.GroupLayout.DEFAULT_SIZE, 256, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(browseB))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jLabel3, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4))
.addGap(0, 0, Short.MAX_VALUE))))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(159, 159, 159)
.addComponent(jButton1)
.addGap(0, 0, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(28, 28, 28)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(browseTF, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(browseB))
.addGap(7, 7, 7)
.addComponent(jButton1)
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))
.addContainerGap(176, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(24, 24, 24)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(27, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(18, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void browseBActionPerformed(java.awt.event.ActionEvent evt) {
}
/**
* @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(Flood.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Flood.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Flood.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Flood.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 Flood().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton browseB;
private javax.swing.JTextField browseTF;
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JPanel jPanel1;
公共类洪水扩展javax.swing.JFrame{
/**
*创建新表单NewJFrame
*/
公共静态int[]multi;
公众洪水(){
初始化组件();
browseB.addActionListener(新ActionListener(){
@凌驾
已执行的公共无效行动(行动事件ae){
JFileChooser fc=新的JFileChooser();
开关(fc.showOpenDialog(null)){
案例JFileChooser.APPROVE\u选项:
File File=fc.getSelectedFile();
扫描仪输入=空;
试一试{
输入=新扫描仪(文件);
}捕获(FileNotFoundException ex){
Logger.getLogger(Flood.class.getName()).log(Level.SEVERE,null,ex);
}
int行=0;
int col=0;
while(input.hasNextLine()){
++行;
Scanner colReader=新扫描仪(input.nextLine());
while(colReader.hasNextInt()){
++上校;
}
}
multi=新整数[行][列];
input.close();
{
试一试{
输入=新扫描仪(文件);
}捕获(FileNotFoundException ex){
Logger.getLogger(Flood.class.getName()).log(Level.SEVERE,null,ex);
}
}
对于(int i=0;i
对于(int i=0;i,这里有一个无限循环:
while (colReader.hasNextInt()) {
++col;
}
您根本没有推进colReader
扫描器,因此它将永远查看行中的第一个int值
您可以通过在遇到每个int值时移动它来修复它:
while (colReader.hasNextInt()) {
colReader.nextInt();
++col;
}
将来,您可以自己解决这样的问题,方法是使用调试器检查程序被卡住的位置,或者,如果您在命令行上运行,则通过在Windows上使用Ctrl-Break或在Linux和OS X上使用Ctrl-\(SIGQUIT)强制Java为每个活动线程打印堆栈跟踪。这里有一个无限循环:
while (colReader.hasNextInt()) {
++col;
}
您根本没有推进colReader
扫描器,因此它将永远查看行中的第一个int值
您可以通过在遇到每个int值时移动它来修复它:
while (colReader.hasNextInt()) {
colReader.nextInt();
++col;
}
将来,您可以自己解决这样的问题,方法是使用调试器检查程序被卡住的位置,或者,如果您在命令行上运行,则使用Windows上的Ctrl Break或Ctrl-\(SIGQUIT)强制Java为每个活动线程打印堆栈跟踪在Linux和OS X上。但在应用解决方案后…它仍然会出现问题,但在应用解决方案后…它仍然会出现问题