You can obtain information about collections in Java online at the Java section of the Oracle Docs website. Alternatively, you can also find this information at the Wikipedia. Once on the website, type "Java collections framework" into the search field at the top of the page and press enter to bring up the information.
The main advantage is that you don't have to implement those collections yourself. Java provides very efficient implementations for dozens of collections.
Careers that use Java Collections include programmers who build data capture and storage programs, as a Java Collection is a framework that allows a programmer to implement reusable data into a program.
Information concerning the use or purpose of Java switches can be obtained directly from Java's website. Alternatively, community forums specializing in Java will also be able to provide such information.
Core java consists of basics of java language (OOP, Threading, Exceptions, Collections, Annotations, Internationalization etc) along with other technologies like JDBC, Servlets. Advanced java is the next step of core java. This consists of JSP, EJB, Beans etc.
You don't specify "these methods", but chances are what you're looking for is the charAt method
Dictionary, Hashtable ,Properties ,Stack and vector are the legacy classes in java
There are many places where one could find information regarding Java lang objects. One could check the official Java website for information from users regarding Java language objects.
Java 1.6 includes all updates from Java 1.5. This adds the idea of generics to Java, which is worth using if you ever work with collections of data. Version 1.6 is basically a major update of 1.5 which includes many security fixes and a speed boost to code execution.
One could find more information about the Java Virtual Machine online on various websites such as 'Wikipedia', 'Java-Virtual-Machine' and of course the website 'Java'.
Information on Java data objects can be found on several websites that offer Java tutorials. Among these websites are the Oracle website and also Wikipedia.
A Java is a breed of pony that originated on Java in Indonesia. For more information, see: http://en.wikipedia.org/wiki/Java_Pony
Java barcode reader is barcode reader in java applications which can read out the information encoded in the barcode.