java的hasNext()的用法

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Java End-of-fileby Shafaet

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"In computing, End Of File (commonly abbreviated EOF) is a condition in a computer operating system where no more data can be read from a data source." — (Wikipedia: End-of-file)

The challenge here is to read  lines of input until you reach EOF, then number and print all  lines of content.

Hint: Java‘s Scanner.hasNext() method is helpful for this problem.

Input Format

Read some unknown  lines of input from stdin(System.in) until you reach EOF; each line of input contains a non-empty String.

Output Format

For each line, print the line number, followed by a single space, and then the line content received as input.

Sample Input

Hello worldI am a fileRead me until end-of-file.

Sample Output

1 Hello world2 I am a file3 Read me until end-of-file.

 

import java.util.*;import java.io.*;import java.text.*;import java.math.*;import java.util.regex.*;class Main{            public static void main(String[] args) {           Scanner scan = new Scanner(System.in);           for(int i = 1; scan.hasNext(); i++){               System.out.println(i + " " + scan.nextLine());           }        }       // sc.close();            }

　　

java的hasNext()的用法