String, StringBuffer & stringBuilder in JAVA

1] Differnces between the above three is:

   String is immutable

   StringBuffer & StringBuilders are mutable.

2] Differnces between the StringBuffer& stringBuiler:

   StringBuffer is synchronized.

   StringBuilder is unsynchronized.

3] On which scenario we have to use the above three?

   String: If the text is not going to change use a string Class because a String object is    immutable.

   StringBuffer: If the text can changes, and will be accessed from multiple threads, use a StringBuffer because StringBuffer is synchronous.

   StringBuilder : If the text can change and will only be accessed from a single thread, then use StringBuilder because StringBuilder is unsynchronized.

Setting the class path to JAVA on Windows XP and 2000

Setting the class path to JAVA on Windows XP &2000

• Open the System Properties window (by right-clicking on My Computer and selecting Properties, or through the Control Panel - Start -> Control Panel -> System).

• On the Advanced tab, click the Environment Variables button.

• In user variables, select the new tab and give the variable name as JAVA_HOME and value as path of the java folder (Example: C:\Java)

• In System variables we have to set the CLASSPATH; if it is already exists then add the java path up o lib folder (Example C:\Java\lib)