Add two variables and assign the value into First variable. Subtract the Second value with the result Value. and assign to Second variable. Subtract the Result of First Variable With Result of Second Variable and Assign to First Variable. Example:
int a=5,b=10;a=a+b; b=a-b; a=a-b;.

No the program fails to compile. The compiler says that the main method is already defined in the class.

Reflection is the process of introspecting the features and state of a class at runtime and dynamically manipulate at run time. This is supported using Reflection API with built-in classes like Class, Method, Fields, Constructors etc. Example: Using Java Reflection API we can get the class name, by using the getName method.

Yes, the JVM maintains a cache by itself. It creates the Objects on the HEAP, but references to those objects are on the STACK.

A static method can be synchronized. If you do so, the JVM will obtain a lock on the java.lang. Class instance associated with the object. It is similar to saying:
          synchronized(XYZ.class) {
          }.

A StringTokenizer is utility class used to break up string.
Example:
StringTokenizer st = new StringTokenizer("Hello World");
     while (st.hasMoreTokens()) {
         System.out.println(st.nextToken());
     }
Output:
Hello
World.

Applet  is a dynamic and interactive program that runs inside a web page displayed by a java capable browser,It can be downloaded in the clinet environment & start running there.

The life cycle fo applet is

1. intiliasation
2. service
3. Destroy