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‎README.md

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Java examples from Chapter 2 and Chapter 15 as described in Learning Android book, 2nd Edition by Marko and Mas:
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http://shop.oreilly.com/product/0636920023456.do

‎src/com/marakana/examples/ComplexExample.java

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package com.marakana.examples;
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/*
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In this example, ComplexExample has a main method when executed
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instantiates a MsgGenerator object and then passes this object to a
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Thread. The Thread's process is then started and then the main thread
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waits till the generator object notifies that it is done (via the
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notifyAll()). At this point the generator's printList method is called
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and information about what was in the generator's list is printed out.
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*/
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public class ComplexExample {
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public static void main(String[] args) {
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System.out.println("ComplexExample start");
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MsgGenerator generator = new MsgGenerator();
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Thread thread = new Thread(generator);
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thread.start();
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try {
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synchronized(generator) {
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generator.wait();
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}
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} catch (InterruptedException ie) {
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System.err.println("Generator Wait Interrupted!!!");
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ie.printStackTrace();
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} finally {
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System.out.println("Generator Wait End");
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}
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generator.printList();
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System.out.println("ComplexExample end");
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}
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}

‎src/com/marakana/examples/HelloWorld.java

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package com.marakana.examples;
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public class HelloWorld {
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public static void main(String[] args) {
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System.out.println("Hello World");
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}
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}

‎src/com/marakana/examples/MsgGenerator.java

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package com.marakana.examples;
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import java.util.ArrayList;
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import java.util.Random;
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public class MsgGenerator implements Runnable {
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private ArrayList<MsgInterface> list;
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public MsgGenerator() {
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list = new ArrayList<MsgInterface>();
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}
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public void run() {
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Random rand = new Random();
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int r = 0;
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ArrayList<MsgInterface> localList = new ArrayList<MsgInterface>();
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while((r = rand.nextInt(20)) < 18) {
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MsgInterface msg = null;
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switch (rand.nextInt(3)) {
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case 0: msg = new MsgTypeImplementation();
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break;
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case 1: msg = new MsgTypeAdditional();
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break;
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case 2: msg = new MsgTypeImplementationExtended();
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break;
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}
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msg.setMsg("Num is: "+r);
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localList.add(msg);
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}
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synchronized(this) {
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list = localList;
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this.notifyAll();
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}
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}
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public void printList() {
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ArrayList<MsgInterface> localList;
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synchronized (this) {
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localList = list;
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}
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System.out.println("List Contents:");
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for(MsgInterface msg : localList) {
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System.out.println(" "+msg.getMsgType()+" msg = "+msg.getMsg());
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if(msg.getMsgType().equals("MsgTypeImplementationExtended")) {
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System.out.println(" *** Overloaded getMsg : "+
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((MsgTypeImplementationExtended) msg).getMsg("Special") +
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((MsgTypeImplementationExtended) msg).getMsg(99));
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}
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}
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System.out.println("List Size: "+list.size());
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}
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}

‎src/com/marakana/examples/MsgInterface.java

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package com.marakana.examples;
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public interface MsgInterface {
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void setMsg(String msg);
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String getMsg();
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String getMsgType();
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}

‎src/com/marakana/examples/MsgTypeAdditional.java

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package com.marakana.examples;
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public class MsgTypeAdditional implements MsgInterface {
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private String msg;
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public MsgTypeAdditional() { }
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public MsgTypeAdditional(String msg) {
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setMsg(msg);
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}
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public void setMsg(String msg) {
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this.msg = msg + " 2";
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}
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public String getMsg() {
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return this.msg;
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}
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public String getMsgType() {
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return "MsgTypeAdditional";
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}
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}

‎src/com/marakana/examples/MsgTypeImplementation.java

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package com.marakana.examples;
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public class MsgTypeImplementation implements MsgInterface {
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private String msg;
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public void setMsg(String msg) {
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this.msg = msg;
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}
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public String getMsg() {
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return this.msg;
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}
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public String getMsgType() {
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return "MsgTypeImplementation";
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}
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}

‎src/com/marakana/examples/MsgTypeImplementationExtended.java

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package com.marakana.examples;
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public class MsgTypeImplementationExtended extends MsgTypeImplementation {
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@Override
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public String getMsgType() {
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return "MsgTypeImplementationExtended";
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}
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// here we Overload the getMsg() method so we now have an
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// additional method that adds something to the getMsg() string
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public String getMsg(String pre) {
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return pre+" "+getMsg();
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}
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// and again we Overload the getMsg() method this time with a int
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public String getMsg(int post) {
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return " -- "+post;
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}
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}

‎src/com/marakana/examples/QuickHttpExample.java

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package com.marakana.examples;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.net.URL;
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import java.net.HttpURLConnection;
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public class QuickHttpExample {
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public static void main(String[] args) {
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HttpURLConnection urlConnection = null;
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try {
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URL url = new URL("http://yamba.marakana.com/api/statuses/public_timeline.json");
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urlConnection = (HttpURLConnection) url.openConnection();
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int statusCode = urlConnection.getResponseCode();
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System.out.println("Response Code: "+statusCode);
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BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
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String textline = null;
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while((textline = in.readLine()) != null) {
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System.out.println(textline);
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}
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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if(urlConnection != null) urlConnection.disconnect();
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}
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}
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}

‎src/com/marakana/examples/SimpleExample.java

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package com.marakana.examples;
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/*
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A simple example class with a basic main method
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that instantiates several objects of the class,
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manipulates the objects, and outputs information
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about the object
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*/
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public class SimpleExample {
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private int number;
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public SimpleExample() { }
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public void setValue(int val) {
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number = val;
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}
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public int getNumber() {
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return number;
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}
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public static void main(String[] args) {
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for(int i=0;i<10;i++) {
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SimpleExample example = new SimpleExample();
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if(i/2 <= 2) {
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example.setValue(i);
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} else {
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example.setValue(i*10);
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}
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System.out.println("SimpleExample #"+i+"'s value is "+example.getNumber());
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}
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}
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}

‎src/com/marakana/examples/SimpleExampleWErrorHandling.java

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package com.marakana.examples;
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/*
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A simple example class with a basic main method
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that instantiates several objects of the class,
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manipulates the objects, and outputs information
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about the object
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*/
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public class SimpleExampleWErrorHandling {
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private int number;
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public SimpleExampleWErrorHandling() { }
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//------- ERROR HANDLING PART 1
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public void setValue(int val) throws Exception {
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if(val < 0) throw new Exception("setValue Exception- Value that is set is Negative!");
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number = val;
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}
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public int getNumber() {
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return number;
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}
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public static void main(String[] args) {
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for(int i=0;i<10;i++) {
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SimpleExample example = new SimpleExample();
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if(i/2 <= 2) {
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try { example.setValue(i); } catch (Exception e) { e.printStackTrace(); } //------- ERROR HANDLING PART 4
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} else {
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try { example.setValue(i*10); } catch (Exception e) { e.printStackTrace(); } //------- ERROR HANDLING PART 4
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}
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System.out.println("SimpleExample #"+i+"'s value is "+example.getNumber());
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}
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showErrorHandling(); //------- ERROR HANDLING PART 2
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}
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//------- ERROR HANDLING PART 3
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public static void showErrorHandling() {
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// here we show Error Handling
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try {
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System.out.println();
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System.out.println("SimpleExample BadValue Insert Case Start");
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SimpleExample example = new SimpleExample();
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example.setValue(-10);
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System.out.println("SimpleExample BadValue's value is "+example.getNumber());
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System.out.println("SimpleExample BadValue Insert Case End");
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} catch (Exception e) {
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System.err.println("SimpleExample BadValue Insert Case threw an exception");
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e.printStackTrace();
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} finally {
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System.out.println("SimpleExample BadValue Insert Case Finally Called");
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}
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}
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}

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