reading input till EOF in java

Question

In C++ if I wish to read input till the EOF I can do it in the following manner

while(scanf(\"%d\",&n))
{
    A[i]=n;
    i++;
}

I can

Answer 1

You can do this:

Scanner s = new Scanner(System.in);
while (s.hasNextInt()) {
    A[i] = s.nextInt();
    i++;
}

Answer 2

Scanner scanner = new Scanner(System.in);
int c = 0;
while(scanner.hasNext()){
  System.out.println(++c + " " + scanner.nextLine());
}
scanner.close();
// use while instead of normal for loop. 
// If you need to read a file than BufferReader is the best way to do it, as explained above.

Answer 3

 import java.io.BufferedReader;
 import java.io.FileReader;

BufferedReader br = null;  
     br = new BufferedReader(new FileReader(file));
       while ((line = br.readLine()) != null) {              

     }

    //using Scanner class

    Scanner scanner = new Scanner(file);
    while (scanner.hasNextLine()) {
      String line = scanner.nextLine();
      System.out.println(line);
   }

Answer 4

// assuming that reader is an instance of java.io.BufferedReader
String line = null;
while ((line = reader.readLine()) != null) {
    // do something with every line, one at a time
}

Let me know if you run into difficulties.