Reading particular line while reading text file in java

Question

My question is i come up with a situation that i have a text file that contains following data including 15.

15 // first line

produce,3554,broccoli,5.99,1 //second line

i am using the following code to read the text in the file and printing its output.

try

{

File f = new File("filename.txt");


Scanner s= new Scanner(f);

s.hasNext();

String no = s.nextLine();
int num = Integer.parseInt(no);

System.out.println(num);// which prints number 15 only

}

now i want to read second line leaving first one which is "produce,3554,broccoli,5.99,1" in another variable and print it as i print 15 without using a loop . Is there any way that i can read second line.

Why are you calling hasNext() exactly? Especially if you completely ignore what it returns. — JB Nizet
– JB Nizet, Commented Jul 13, 2013 at 7:34
to check the pointer that does it has a line or not because i am text file is not seen to user — SYED SAAD ALI
– SYED SAAD ALI, Commented Jul 13, 2013 at 7:43
To check that it has a next line, you should use hasNextLine(). And calling the method but doing the same thing whether it returns true or false doesn't check anything. You need an if to make a check. — JB Nizet
– JB Nizet, Commented Jul 13, 2013 at 7:48

JB Nizet · Accepted Answer · 2013-07-13 07:32:12Z

2

String secondLine = s.nextLine();
System.out.println(secondLine);

answered Jul 13, 2013 at 7:32

JB Nizet

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4 Comments

SYED SAAD ALI Over a year ago

if there are undetermined number of line and want to read each of them leaving the first line which i already read it.so is there any other method to read every line in the text file leaving the first one

JB Nizet Over a year ago

Execute nextLine() once and ignore its result, then use a loop calling hasNextLine() and nextLine() (if hasNextLine() returned true) at each iteration.

SYED SAAD ALI Over a year ago

try { File f = new File("filename.txt"); Scanner s= new Scanner(f); s.hasNext(); String no = s.nextLine(); int num = Integer.parseInt(no); System.out.println(no); while(s.hasNextLine()); { String secondLine = s.nextLine(); System.out.println(secondLine); } } i am doing this to read other line but the loop is not terminating . it is terminating when i am reading first line too in that loop

JB Nizet Over a year ago

You have a semicolon right after while(s.hasNextLine()), making it an infinite loop. Remove that semicolon. Using your IDE's auto-format tool to indent your code would have shown you this problem.

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