Homework H4: Get your software set up for later lectures and final project

In this homework, you are expected to run Python or Java programs on FutureSystems or on your local machine. A few examples for beginners will help you to understand how to write and run Java or Python programs on your environment.

Setup

Java and Python are installed on our cloud as explained in Unit 11. Here you choose between Python on your laptop, Python in cloud or Java in cloud.

Local Setup

Download Enthought Canopy Express (free) from https://store.enthought.com/downloads/ including NumPy SciPy Matplotlib

Cloud

Set up Python in cloud or Java in cloud. See Unit 11.

First Program

This code explains how to display a simple string on your screen. You can download or write your own code using your editor.

Java

Download: FirstProgram.java

/**
* Sample Program to print out a message
*
* Compile : javac FirstProgram.java
*     Run    : java FirstProgram
*/
public class FirstProgram {
      public static void main(String[] args){
                System.out.println("My first program on Big Data Applications and Analytics!");
        }
}

This example prints out the message on your screen by println method in the System class. In Java Programming, you need to complie your code to execute.

Compiling and Execution

javac FirstProgram.java

Now, you will have FirstProgram.class file on your system. Java Compiler (javac) creates Java bytecode with a .class extension. We will execute the class file with java command.

java FirstProgram
My first program on Big Data Applications and Analytics!

Python

Let’s write a same program in Python.

Download: FirstProgram.py

# Run python FirstProgram.py
print 'My first program on Big Data Applications and Analytics!'

Python function print simply displays a message on your screen. Compiling is not necessary in Python. You can run your code directly with python command.

python FirstProgram.py
My first program on Big Data Applications and Analytics!

Display System Information

This is an extension of your first program. We will lean how to import functions and use them to get system information like hostname or username.

Java

We now understand how to print out a message using Python or Java. System information such as time, date, user name or hostname (machine name) can be displayed as well with built-in functions in each language.

Download: FirstProgramWithSystemInfo.java

import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 *  * Sample Program with system information
 *  *
 *  * Compile : javac FirstProgramWithSystemInfo.java
 *  *   Run    : java FirstProgramWithSystemInfo
 *  */
public class FirstProgramWithSystemInfo {
        public static void main(String[] args){

                System.out.println("My first program with System Information!");

                // Print Date with Time
                DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
                Date date = new Date();
                System.out.println("Today is: " + dateFormat.format(date));
                // Print Username
                System.out.println("Username is: " + System.getProperty("user.name"));
                // Print hostname
                try {
                        java.net.InetAddress localMachine = java.net.InetAddress.getLocalHost();
                        System.out.println("Hostname is: " + localMachine.getHostName());
                } catch (UnknownHostException e) {
                        e.printStackTrace();
                        System.out.println("No host name: " + e.getMessage());
                }
        }
}

Compiling and Execution

javac FirstProgramWithSystemInfo.java

java FirstProgramWithSystemInfo
My first program with System Information!
Today is: 2015/01/01 18:54:10
Username is: albert
Hostname is: bigdata-host

Python

Download FirstProgramWithSystemInfo.py

from datetime import datetime
import getpass
import socket

# Run python FirstProgramWithSystemInfo.py
print ('My first program with System Information!')

print ("Today is: " + str(datetime.now()))
print ("Username is: " + getpass.getuser())
print ("Hostname is: " + socket.gethostname())

Execution

python  FirstProgramWithSystemInfo.py
My first program with System Information!
Today is: 2015-01-01 18:58:10.937227
Username is: albert
Hostname is: bigdata-host

Submission of HW4

Submit these compiled files or screenshot image files to IU Canvas

[Java]

  • **FirstProgram.class or a screenshot image of the ‘FirstProgram’ execution (25%) **
  • FirstProgramWithSystemInfo.class or a screenshot image of the ‘FirstProgramWithSystemInfo’ execution (25%)

[Python]

  • FirstProgram.pyc or a screenshot image of the ‘FirstProgram’ execution (25%)
    • run python -m compileall FirstProgram.py to generate FirstProgram.pyc
  • FirstProgramWithSystemInfo.pyc or a screenshot image of the ‘FirstProgramWithSystemInfo’ execution (25%)
    • run python -m compileall FirstProgramWithSystemInfo.py to generate FirstProgramWithSystemInfo.pyc

Challenge tasks

Preview Course Examples