我在阅读价值ba，fr，lit和mid时遇到了一些问题。我可以知道如何解决它。我试图将它们声明为全局变量，但它无济于事。请帮忙谢谢，下面是代码，错误发生在这一行（fileout.println（m +“，”+ l +“，”+ s +“，”+ u +“，”+ ba +“，”+ “，”+ fr +“，”+ lit +“，”+ mid）;）
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String m = model.getText();
String l = line.getText();
String s = shift.getText();
String u = unitno.getText();
String ba;
String fr;
String lit;
String mid;
try{
Double b = Double.parseDouble(back.getText());
if(b<350 || b>625){
back.setForeground(Color.BLUE);
back.setBackground(Color.YELLOW);
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(this, "The value that you have entered is not within the range of 350 to 625. Press yes to save anyway and cancel to edit.", "Error", dialogButton);
if(dialogResult ==0){
ba = back.getText();
}
}
else{
ba = back.getText();
back.setForeground(Color.BLACK);
back.setBackground(Color.WHITE);
}
}catch(NumberFormatException nfe){
JOptionPane.showMessageDialog(null,"Please ensure that it is in integer.");
back.setForeground(Color.BLUE);
back.setBackground(Color.YELLOW);
}
try{
Double f = Double.parseDouble(front.getText());
if(f<350 || f>625){
front.setForeground(Color.BLUE);
front.setBackground(Color.YELLOW);
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(this, "The value that you have entered is not within the range of 350 to 625. Press yes to save anyway and cancel to edit.", "Error", dialogButton);
if(dialogResult ==0){
fr = front.getText();
}
}
else{
fr = front.getText();
front.setForeground(Color.BLACK);
front.setBackground(Color.WHITE);
}
}catch(NumberFormatException nfe){
JOptionPane.showMessageDialog(null,"Please ensure that it is in integer.");
front.setForeground(Color.BLUE);
front.setBackground(Color.YELLOW);
}
try{
Double li = Double.parseDouble(little.getText());
if(li<0.8 || li>3.4){
little.setForeground(Color.BLUE);
little.setBackground(Color.YELLOW);
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(this, "The value that you have entered is not within the range of 0.8 to 3.4. Press yes to save anyway and cancel to edit.", "Error", dialogButton);
if(dialogResult ==0){
lit = little.getText();
}
}
else{
lit = little.getText();
little.setForeground(Color.BLACK);
little.setBackground(Color.WHITE);
}
}catch(NumberFormatException nfe){
JOptionPane.showMessageDialog(null,"Please ensure that it is in integer.");
little.setForeground(Color.BLUE);
little.setBackground(Color.YELLOW);
}
try{
Double mi = Double.parseDouble(middle.getText());
if(mi<0.8 || mi>3.4){
middle.setForeground(Color.BLUE);
middle.setBackground(Color.YELLOW);
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(this, "The value that you have entered is not within the range of 0.8 to 3.4. Press yes to save anyway and cancel to edit.", "Error", dialogButton);
if(dialogResult ==0){
mid = middle.getText();
}
}
else{
mid = middle.getText();
middle.setForeground(Color.BLACK);
middle.setBackground(Color.WHITE);
}
}catch(NumberFormatException nfe){
JOptionPane.showMessageDialog(null,"Please ensure that it is in integer.");
middle.setForeground(Color.BLUE);
middle.setBackground(Color.YELLOW);
}
BufferedWriter output = null;
FileInputStream fs = null;
FileWriter fout = null;
try {
// TODO add your handling code here:
File myFile = new File("C:/Users/kai/Desktop/capforce.txt");
if(!myFile.exists()) {
myFile.createNewFile();
}
fs = new FileInputStream("C:/Users/kai/Desktop/capforce.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(fs));
output = new BufferedWriter(new FileWriter(myFile,true));
PrintWriter fileout = new PrintWriter(output,true);
if (br.readLine() == null) {
fileout.println("Model" + " " + "Date" + " " + " " + "Line" + " " + "Shift" + " " + "Unit Number" + " "+ "Capped Force - Capped Z1 (Back)" + " " + "Capped Force - Capped Z1 (front)" + " " +"Wiper to pen interference Z(Little man)" + " " + "Wiper to pen interference Z(Middle man)" );
}
for(int i = 1; i<100; ++i){
String line = br.readLine();
if(line==null){
fileout.println(m + " , " + l + " , " + s + " , " + u + " , " + ba + " , " + " , " + fr + " , " + lit + " , " + mid );
break;
}
}
} catch (IOException ex) {
Logger.getLogger(setup.class.getName()).log(Level.SEVERE, null, ex);
} finally {
try {
output.close();
} catch (IOException ex) {
Logger.getLogger(setup.class.getName()).log(Level.SEVERE, null, ex);
}
}
this.dispose();
}
答案 0 :(得分：3)
初始化所有变量：
String ba = null;
String fr = null;
String lit = null;
String mid = null;