"out.txt" content is
1
My JAVA code is like this.
int val=0;
BufferedReader br = new BufferedReader(new FileReader("out.txt"));
while(true) {
String line = br.readLine();
if (line==null) break;
val=Integer.parseInt(line);
}
br.close();
and debugger says,
java.lang.NumberFormatException: For input string: "1"
i need to use 1 from "out.txt". How can i use 1 as Integer? Thank you for your attention :)
You must be having the trailing whitespaces. Use the trim() function as follows:
val = Integer.parseInt(line.trim());
Here is the code snippet:
int val = 0;
BufferedReader br = new BufferedReader(new FileReader("out.txt"));
String line = null;
while(true) {
line = br.readLine();
if (line == null) break;
val = Integer.parseInt(line.trim());
}
br.close();
Also, if you want to check whether String is null or empty you can start using the Apache Commons StringUtils as follows:
if (StringUtils.isEmpty(line)) break;
I removed this invisible Unicode character and now parsing to INT works great. I know it's not the case here but maybe can help some other people.
text = text.replaceAll("\\uFEFF", "");
Did you create the file on a Mac? Probably there is some hidden character. You can create it on Windows and try again.
Oops. Yesterday the following code worked well so i uploaded it as you are seeing. but today, i tried compile one more time without '.toString()' and well, it worked too. So It was my mistake and I'm sorry to bother you guys. (I don't know why it didn't work without '.toString' exactly the day before yesterday.)
Thank you so much people who cared of my question but i found the answer(i don't know how to find it by myself)
following codes work very well :) Thank you!
BufferedReader br = new BufferedReader(new FileReader("out.txt"));
int val=0;
while(true) {
String line = br.readLine();
if (line==null) break;
val=Integer.parseInt(line.toString());
}
br.close();
line is already a String! What do you think will happen if you do toString() on it?