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Java SE

Java SE’s API provides the core functionality of the Java programming language. It defines
everything from the basic types and objects of the Java programming language to high-level
classes that are used for networking , security , database access , graphical user interface
developments.Below links will take you through simple and practical approach while learning Java SE.
Package – java.lang
  How to validate the password by using regular expression in java
  How to validate email address by using regular expression in java.
Autoboxing and Unboxing in java.
 Difference between equals method and == operator in java.
 String vs StringBuffer vs StringBuilder in java.
Java comparable and comparator interfaces example.
Threads in java ( Multithreading ) with an example.
Thread synchronization (thread safety) in java – example.
 Inter thread communication in java.

java Io

Package – java.io
How to create a file from URI with File constructor.
How to read file using FileInputStream in java.
Write String to file using FileWriter in java.
How to read file using BufferedReader in java.
 The difference between file URI and URL in java
 Get or Set Last Modified Date and Time for a File or directory in java.
 How to find all hidden files in a folder or directory in java.
 How to create a temp file in default or specified directory.
 How to delete a file or folder from directory in java.
 How to rename a file from a directory or folder in java.
 How to get all filenames from a directory or folder in java.
 How to get file names having certain extension or suffix.
 How to create a file from createNewFile method in java.

java Util

Package – java.util
 Difference between Iterator ListIterator and Enumeration in java.
 Difference between Set List and Map in java Collections Framework.
 addAll method in Collections framework.
 What is Map interface.
 What is List interface.
 removeAll method in Collections framework.
 containsAll method in Collections framework.
toArray method in Collections framework.
 retainAll method in Collections framework.
 What is Set interface.
 Iterator and ListIterator.
 How to iterate Map elements.
 Difference between Set and Map.
 Difference between List and Set.

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