Reading coloum from txt file in java

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How I read specific coloum from the text file and save the coloum in an array?
the file:

8

- 3,4 2 0

- 5 3 0

1 6 2 1

1 7,8 3 1

2 7 2 1

3 8 3 2

4,5 8 2 2

4,6,7 - 1 3

What I have tried:

I did not found tired for my quesion

Posted 3-Apr-18 6:57am

Member 13750108

Updated 3-Apr-18 7:49am

Maciej Los

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Maciej Los · Accepted Answer · 2018-04-03T07:51:00

Solution 1

Steps to do:
1. Read text file: Reading, Writing, and Creating Files (The Java™ Tutorials > Essential Classes > Basic I/O)[^]
2. Loop through the collection of lines and split single line into parts: String.split[^]
3. Use index of array to get proper "column":

Java

String[] lines = Files.readAllLines(Paths.get("FullFileName.txt"));
for (String line : lines) {
    String[] parts = line.split(" "); //space as column delimiter
    //parts[3] -  4. column
    System.out.println(parts[3]);
}

For further details, please see:
Different ways of Reading a text file in Java - GeeksforGeeks[^]
Java Read Text File Examples - JavaDevNotes[^]

Good luck!

Posted 3-Apr-18 7:51am

Maciej Los

Comments

Christiaan van Bergen 3-Apr-18 14:04pm

That is of course when the text file is space delimited . Maybe splitting this one per character?

Maciej Los 3-Apr-18 14:31pm

I was looking at file text content posted by OP. Seems it's space delimited ;)

Christiaan van Bergen 3-Apr-18 14:36pm

Yes, it appears so, but I was confused by the '-' (minus characters) in the sample and the two commas in the last line. So, I thought the OP might mean columns per character. But hey, your example should help <<thumbsup>>

Maciej Los 3-Apr-18 14:40pm

As same as this line is confusing: 4,6,7 - 1 3?