read integer input from keyborad in java

read integer input using Scanner

/**
 * @author lautturi.com 
 * Java example: java read integer input
 */

import java.util.*;
import java.io.*;

public class Lautturi {
    
	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
	    //get int
	    int num= scan.nextInt();
	    System.out.println(num);
	}
}

read integer input using InputStreamReader in java

/**
 * @author lautturi.com 
 * Java example: java read integer input
 */

import java.util.*;
import java.io.*;

public class Lautturi {
    
	public static void main(String[] args) throws NumberFormatException, IOException  {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		//get int
		int i = Integer.parseInt(br.readLine());
	    System.out.println(i);
	}
}

output:

123<enter>
123