#!/bin/bash -xe
cat << "JAVA" > Checker.java && javac Checker.java
import java.net.HttpURLConnection;
import java.net.URL;

public class Checker {
  public static void main(String[] args) throws Exception {
    HttpURLConnection conn =
            (HttpURLConnection) new URL(args[0])
                    .openConnection();
    System.exit(
            200 == conn.getResponseCode()
                    ? 0
                    : 1
    );
  }
}
JAVA

java Checker http://google.pl && echo OK || echo BAD