How to convert a collection to String in Java

private Map<String, Integer> collection = new HashMap<String, Integer>();

collection.put("row #1", 1);
collection.put("row #2", 2);

for ( String key : collection.keySet() ) {
    System.out.println( key );
}

Source: http://stackoverflow.com/questions/10462819/get-keys-from-hashmap-in-java

How to install Oracle Java 8 on Ubuntu

1. Open terminal
2. Type
   sudo apt-get update
   
   sudo apt-get install default-jre sudo apt-get install default-jdk
   
   sudo add-apt-repository ppa:webupd8team/java
   sudo apt-get update
   
   sudo apt-get install oracle-java8-installer
   
   sudo update-alternatives --config java
   
   
3. Choose the java installation number that you want to use as a default
4. Copy the path
5. Type
   sudo gedit /etc/environment
   
   
6. At the end of the file, add the following line:
   JAVA_HOME={DEFAULT JAVA PATH}
   {DEFAULT JAVA PATH} is the java installation number that you selected on step 3
   
   
7. Save the file
8. Close the editor
9. Type
   source /etc/environment

Example:

I want to use the Oracle Java 8 as default and set the JAVA_HOME to it:

1. Open terminal
2. Type
   sudo apt-get update
   
   sudo apt-get install default-jre sudo apt-get install default-jdk
   
   sudo add-apt-repository ppa:webupd8team/java
   sudo apt-get update
   
   sudo apt-get install oracle-java8-installer
   
   sudo update-alternatives --config java
   
   
3. Ubuntu will return to a content similar like the below:
   There are 2 choices for the alternative java (providing /usr/bin/java).
   
     Selection    Path                                            Priority   Status
   ------------------------------------------------------------
   * 0            /usr/lib/jvm/java-8-oracle/jre/bin/java          1082      auto mode
     1            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode
     2            /usr/lib/jvm/java-8-oracle/jre/bin/java          1082      manual mode
   
   Press <enter> to keep the current choice[*], or type selection number: 
   
   
4. Type 0
5. Copy the path of the selection 0 until java-8-oracle ( /usr/lib/jvm/java-8-oracle)
6. Type
   sudo gedit /etc/environment
   
   
7. At the end of the file, add the following line:
   JAVA_HOME=" /usr/lib/jvm/java-8-oracle"
   
   
8. Save the file
9. Close the editor
10. Type
    source /etc/environment

Source: https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04

How to get keys from HashMap in Java

private Map<String, Integer> collection = new HashMap<String, Integer>();

collection.put("row #1", 1);
collection.put("row #2", 2);

for ( String key : collection.keySet() ) {
    System.out.println( key );
}

Source: http://stackoverflow.com/questions/10462819/get-keys-from-hashmap-in-java

How to connect to the SDL Tridion 2011 core services client using JAVA?

1. Create a new folder under your source project
2. Open a terminal window and go to the JDK\bin folder
3. Type the following ws-import command:
   wsimport -extension -keep -Xnocompile -d {location of the source folder} {Webservice URL}
   
   
4. Create the authenticator class:
   import java.net.Authenticator;
   import java.net.PasswordAuthentication;
   
   public class BasicHttpAuthenticator extends Authenticator {
   
      private String user;
      private String password;
   
      public BasicHttpAuthenticator(String user, String password) {
         this.user = user;
         this.password = password;
      }
   
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {
         return new PasswordAuthentication(user, password.toCharArray());
      }
   }
   
   
5. Create the web service client class:
   
   import java.net.Authenticator;
   import java.net.URL;
   
   import javax.xml.namespace.QName;
   
   import com.sdltridion.contentmanager.coreservice._2011.CoreService2011;
   import com.sdltridion.contentmanager.coreservice._2011.ICoreService;
   import com.sdltridion.contentmanager.r6.UserData;
   
   public class Main {
      private static final QName Q_NAME = new QName("http://www.sdltridion.com/ContentManager/CoreService/2011", "CoreService2011");
   
      public static void main(String[] args) throws Exception {
         BasicHttpAuthenticator basicHttpAuthenticator = new BasicHttpAuthenticator({user}, {password});
         Authenticator.setDefault(basicHttpAuthenticator);
   
         URL url = new URL({Webservice URL});
         CoreService2011 service = new CoreService2011(url, Q_NAME);
         ICoreService client = service.getBasicHttp();
   
         UserData currentUser = client.getCurrentUser();
         System.out.println(String.format("'%s' %s",
         currentUser.getTitle().getValue(), currentUser.getId()));
   }

{user} is an account with access to the CMS
{password} is the account password
{Webservice URL} is the core service URL

Example:

Java version used for this project is Java 1.8.0_66-b17

{user}: administrator
{password}: h}S<77Sn
{Webservice URL}: http://www.blogger.com/webservices/CoreService2011.svc?singleWsdl
{location of the source folder}
     Windows: C:\source\CoreService2011\src
     Linux: /source/CoreService2011/src
JDK\bin folder: the default locations are
     Windows 64-bits: C:\Program Files\Java\jdk1.8.0_66\bin
     Linux: /usr/lib/jvm/java-8-oracle/bin

Structure of the project:
src
+--- BasicHttpAuthenticator.java
+--- Main.java

wsimport -extension -keep -Xnocompile -d /source/CoreService2011/src http://www.blogger.com/webservices/CoreService2011.svc?singleWsdl

import java.net.Authenticator;
import java.net.PasswordAuthentication;

public class BasicHttpAuthenticator extends Authenticator {

   private String user;
   private String password;

   public BasicHttpAuthenticator(String user, String password) {
      this.user = user;
      this.password = password;
   }

   @Override
   protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication(user, password.toCharArray());
   }
}

import java.net.Authenticator;
import java.net.URL;

import javax.xml.namespace.QName;

import com.sdltridion.contentmanager.coreservice._2011.CoreService2011;
import com.sdltridion.contentmanager.coreservice._2011.ICoreService;
import com.sdltridion.contentmanager.r6.UserData;

public class Main {
   private static final QName Q_NAME = new QName("http://www.sdltridion.com/ContentManager/CoreService/2011", "CoreService2011");

   public static void main(String[] args) throws Exception {
      BasicHttpAuthenticator basicHttpAuthenticator = new BasicHttpAuthenticator("administrator", "h}S<77Sn");
      Authenticator.setDefault(basicHttpAuthenticator);

      URL url = new URL("http://www.blogger.com/webservices/CoreService2011.svc?singleWsdl");
      CoreService2011 service = new CoreService2011(url, Q_NAME);
      ICoreService client = service.getBasicHttp();

      UserData currentUser = client.getCurrentUser();
      System.out.println(String.format("'%s' %s", currentUser.getTitle().getValue(), currentUser.getId()));
   }
}

Source: http://yatb.mitza.net/2012/12/a-core-service-java-client.html

How to do foreach in Java

List<String> collection = new ArrayList<String>();

collection.add("Hello");
collection.add("World");

for(String item:collection)
{
System.out.println(item);
}

Source: http://stackoverflow.com/questions/85190/how-does-the-java-for-each-loop-work