Writing data in text file..

Question

1. check the file name in D:\\temp\\test.txt
2. if it exists, then open file. if there is data, then read data. after the last record, it writes new data.
3. if it does not exist, create text.txt file and write data into text.txt file.
so far, I have a code..
import java.io.*;
import java.util.*;
public class Main {
public static void main(String[] args) {
String filename="test";
String format = "%1$-9s%2$-3s%3$-30s%4$-30s%5$-30s\n";
String arraydata[] = { "John", "F.", "Kennedy", " ", "t", "John2", "F2.", "Kennedy2", " ", "t2"};
String cnt_id ="2";
int cnt_orderid = Integer.valueOf(cnt_id);
try
PrintStream ps = new PrintStream(new FileOutputStream("D:\\temp\\"+filename+".txt"));
for (int i=1; i<cnt_orderid; i++)
ps.println(String.format(format, (Object[])arraydata)); // write in test.txt file
ps.close();
catch (Exception e)
System.out.println(e);
my question is..
1. how to check the file exists or not
2. how to write the data in the new line after the last data in the file.

Answer 1

1. Use a File object.
File file = new File("someFile.txt");
if (file.exists()) { ... }2. Consider using FileWriter; the constructor allows you to append to the end of the file:
FileWriter fileWriter = new FileWriter(file, true);Michael