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how to use same java source file as input to read file

import java.util.*;
public class charPerLine {



public static void main(String[] args)throws StringIndexOutOfBoundsException {
Scanner sc=new Scanner(System.in);
...

how to scan for possible email address from text file in java

hi friends i am begner for java programing i have some doubts.while doing programs please help me.how can i read positive numbers and positive number from textfile.how can i write them into separate...