CODEWITHSUNDEEP
java
Adeetya Ravisankar
Adeetya Ravisankar

Reputation: 79

Reading from third line of text file

How can I start reading from the third line of text file in Java? I want to store 12 in 'nodes' variable, 14 in'edges' variable. 12334 in different variable and so on. My input text file consisting of integers goes like this:

12
14
12334 12214 25
32151 32151 85
21514 51454 20
.
.
.
.
.

         try
                {

                    for(i=0;i<2;i++)
                            array[i] = inputFile.nextInt();
                    nodes=array[0];
                    edges=array[1];
                    break;

                    for(i=2;i<5;i++)
                     {
                            array1[i] = inputFile.nextInt();
                    System.out.println(array1[i]);
                            }



                        }

Upvotes: 0

Views: 2042

Answers (2)

Kick Buttowski
Kick Buttowski

Reputation: 6747

Note: Having break is going to terminate the outer loop

Suggestiones how to solve this

1 . Either use BufferReader or Scanner class.

2 . Have a counter variable set to zero

3. keep reading line and check if it is equal to 3 yet

4. continue reading line, but when the counter is equal 3, save each line in either variable or Array

Difference between BufferReader and Scanner

1. BufferedReader has significantly larger buffer memory than Scanner. Use BufferedReader if you want to get long strings from a stream, and use Scanner if you want to parse specific type of token from a stream.

2. Scanner can use tokenize using custom delimiter and parse the stream into primitive types of data, while BufferedReader can only read and store String.

3. BufferedReader is synchronous while Scanner is not. Use BufferedReader if you're working with multiple threads.

Upvotes: 0

Jean Logeart
Jean Logeart

Reputation: 53829

Using Scanner:

Scanner sc = new Scanner(myFile);
int lineIndex = 0;
while(sc.hasNextLine()) {
    String line = sc.nextLine();
    if(++lineIndex > 3) {
        // do something
    }
}

Upvotes: 2

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