Two classes that can store arbitrary number of objects ?

ArrayList and Vector

why pointers are not used in java?

Pointers can be used to access the memory location i.e out of JVM also.This is not prefered because of security concern. Another Reason: Applets can breach the firewall between networked application and personal computer

Why java does not have multiple inheritance?
but in c++ ?

Java supports the multiple inheritance but only in interfaces. It means you can implements more than one interfaces but you can't extends more than one classes. So we can't say that Java doesn't support multiple inheritance.

Deferred Test Case:-

The Test case which is suspended for the next version or not used in the current version is called deferred test case.

JavaSoft/MS J++ Executables:-

Java Algo:-

1. Code: Java programmers write source code in text files (perhaps using an IDE), then saved with a file suffix of .java.

   Java considers all files residing together in a specific project directory/folder part of a custom package of files containing localized resource messages, images, sounds, GUI forms, HTML code, query definitions, parameters (data paths to resources), and third-party library classes.

   Each source file must contain an import command to specify each external package it references, except for the java.lang library automatically included by the compiler.

2. Compile: Class files are built from source files by a Java compiler provided with the JDK or with an IDE. Byte-code is called neutral intermediate code because its syntax is conceptually between human(nerd)-readable source and low-level machine code. Discussions about a Java "class" refer collectively to the byte-code and the source code from which it is derived.

3. Correct Syntax Errors: The compiler issues messages to the programmer if the source code does not meet Sun's Java Language Specifications 2nd Edition. Many programmers apply additional tools to source code.

   If the compiler strictly follows Sun's Java Virtual Machine Specification, it should create byptecode that is usable by a Class Loader within any Java Virtual Machine (JVM) running on a target client's machine with a variety of operating systems (Windows, UNIX, Linux, etc.).

4. Invoke: Running in a “soft” universal abstraction layer, the JVM dynamically (as needed) loads Java Core APIs and custom application classes. This is called just-in-time compilation.

   Before Java applets can be linked from an Internet browser or Java applications invoked from the client machine's file system, the JVM must be installed on the client machine.

   The JVM uses port 5901.

5. Behind the scenes, A Bytecode Verifier detects whether the bytecode violates Java security restrictions and other run-time checks.

6. Execute: At run-time, the Interpreter translates bytecode into low-level machine language instructions optimized to the specific capabilities of the client machine (multiple processors, etc.). The intrepreter also frees memory automatically by performing garbage collection.

7. Unit Test, debug logic errors, and Tune performance using profilers other utilities.

What is the Java Platform:-

An intermediate JVM makes the Java language device independent because each JVM on the various platforms interpret byte-code the same way.

To optimize Java software performance, the Version 4 Release 2 Operating System on IBM's AS/400 computers has JVM integrated beneath their Machine Interface (MI). On AS/400 V4R2's, Java classes can be run through a "transformer" to compile Java class files into AS/400-dependent object code using the AS/400 Developer Kit (JDK 1.1.4).

Microsoft added Java language support after the initial release of their .NET (dot NET) initiative. The Microsoft Visual J#.NET Redistributable Package 1.1 is installed as a separate program.

Microsoft's does not make use of J# (pronounced J Sharp) code like other Java implementations. Microsoft has its own compilation and run-time architecture for .NET programs.