I'm just trying to do an exercise where I have to read a particular file called test.txt in the following format:
Sampletest 4
What I want to do is that I want to store the text part in one variable and the number in another. I am still a beginner so I had to google quite a bit to find something that would at-least work, here what I got so far.
public static void main(String[] args) throws Exception{
try {
FileReader fr = new FileReader("test.txt");
BufferedReader br = new BufferedReader(fr);
String str;
while((str = br.readLine()) != null) {
System.out.println(str);
}
br.close();
} catch(IOException e) {
System.out.println("File not found");
}
Use a Scanner
, which makes reading your file way easier than DIY code:
try (Scanner scanner = new Scanner(new FileInputStream("test.txt"));) {
while(scanner.hasNextLine()) {
String name = scanner.next();
int number = scanner.nextInt();
scanner.nextLine(); // clears newlines from the buffer
System.out.println(str + " and " + number);
}
} catch(IOException e) {
System.out.println("File not found");
}
Note the use of the try-with-resources syntax, which closes the scanner automatically when the try
is exited, usable because Scanner
implements Closeable
.
You just need:
String[] parts = str.split(" ");
And parts[0] is the text (sampletest) And parts[1] is the number 4
It seems like you are reading the whole file content (from test.txt
file) line by line, so you need two separate List
objects to store the numeric and non-numeric lines as shown below:
String str;
List<Integer> numericValues = new ArrayList<>();//stores numeric lines
List<String> nonNumericValues = new ArrayList<>();//stores non-numeric lines
while((str = br.readLine()) != null) {
if(str.matches("\\d+")) {//check line is numeric
numericValues.add(str);//store to numericList
} else {
nonNumericValues.add(str);//store to nonNumericValues List
}
}
You can use java utilities Files#lines()
Then you can do something like this. Use String#split() to parse each line with a regular expression, in this example i use a comma.
public static void main(String[] args) throws IOException {
try (Stream<String> lines = Files.lines(Paths.get("yourPath"))) {
lines.map(Representation::new).forEach(System.out::println);
}
}
static class Representation{
final String stringPart;
final Integer intPart;
Representation(String line){
String[] splitted = line.split(",");
this.stringPart = splitted[0];
this.intPart = Integer.parseInt(splitted[1]);
}
}
If you are sure the format is always for each line in the file.
String str;
List<Integer> intvalues = new ArrayList<Integer>();
List<String> charvalues = new ArrayList<String>();
try{
BufferedReader br = new BufferedReader(new FileReader("test.txt"));
while((str = br.readLine()) != null) {
String[] parts = str.split(" ");
charvalues.add(parts[0]);
intvalues.add(new Integer(parts[0]));
}
}catch(IOException ioer) {
ioer.printStackTrace();
}
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