file delete不到（Java）

ahcheong

为什么我的file delete不到？？

String status, pack = new String();
String temp = new String();
String temp1 = new String();
String temp2 = new String();
int i = 1;

switch(jComboBox2.getSelectedIndex())
{
case 0:
pack = "13 Ch.";
break;
case 1:
pack = "20 Ch.";
break;
default:
pack = "26 Ch.";
}
try{
File read = new File("customer.txt");

File write2 = new File("customer2.txt");
BufferedReader br = new BufferedReader(new FileReader("customer.txt"));
BufferedWriter bw2 = new BufferedWriter(new FileWriter("customer2.txt", true));
BufferedReader br2 = new BufferedReader(new FileReader("customer2.txt"));
BufferedWriter bw = new BufferedWriter(new FileWriter("customer.txt", true));
/*while((temp = br.readLine()) != null)
{
if(temp.equals(jTextField1.getText()))
{
bw2.write(temp1 + "\n");
bw2.write(temp2 + "\n");
bw2.write(temp + "\n");
bw2.write(pack + "\n");
bw2.write(jComboBox1.getSelectedItem() + "\n");
br.readLine();
br.readLine();
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
bw2.write(br.readLine() + "\n");
i += 17;
}
else
{
bw2.write(temp + "\n");
if(i % 19 == 1)
temp1 = temp;
if(i % 19 == 2)
temp2 = temp;
i++;
}
}
bw2.write("\n");
br.close();
bw2.close();


while((temp = br2.readLine()) != null)
{
bw.write(temp + "\n");
}
bw.write("\n");

bw.close();
read.delete();
}
catch(FileNotFoundException e){
System.out.println Envelope;
}
catch(IOException e){
System.out.printlnEnvelope;
}

ahcheong

用deleteOnExit()又可以。。