Automatic Screenshots capturing tool for android

Screenshots.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

class Screenshots {
    public static void main(String args[]) {

        BufferedReader bufferedReader = null;
        Scanner scanner=new Scanner(System.in);
        int pageno=1;
        try {
            int n=scanner.nextInt();
            while(pageno<n){
                System.out.println("Wait...");
            // Runtime.getRuntime().exec("adb exec-out screencap -p > " +pageno+".png");
            // Runtime.getRuntime().exec("adb shell input swipe 300 700 50 700");
            Process p1=new ProcessBuilder(new String[]{"cmd.exe","/c","adb exec-out screencap -p >" +pageno+".png"}).start();
            Process p2=new ProcessBuilder(new String[] {"cmd.exe","/c"," adb shell input swipe 300 700 50 700"}).start();
            p1.waitFor();
            p2.waitFor();
            pageno++;
            }
        } catch (Exception e) {
            System.out.println("Error");
        }

    }
}