Many reasons, one of them: there is no 'clrscr' in Java.
Function 'clrscr' is not part of the C language. Or the standard libraries. It is MS-DOS specific function, use the help for details (clrscr means clear the screen).
Java does not support Pointers and hence you cannot use it in Java.
No, you don't have to.
Java is exclusive to surfing the web. Some web sites use Java to embed videos, others use Java for advertisements.
No
Java does not have pointers
Java 7 is the most current version of Java. Many movies and games use Java.
You can use Head First Java or Java Complete Reference to learn Java.
by using "clrscr" command at starting of the program
You can use system("cls") function with stdlib.h
Not usually. There are numerous languages out there with similar functionality. The only time you must use Java is if your employer or client demands that a project be done in Java, or a particular platform requires the use of Java, such as Android OS.
RuneScape bots use Java. Use a Java Binary Code.