How Java is so secure than other?

Last night i read out the fundamentals of java from Java Complete reference.I could understand some feature of java with no doubts.But i was not able to understand how java supports Security and Portability.
Could you explain how java is so secure and portability than other language?

Thanks in advance..

portability...
compiled java is bytecode for java virtual machine, not for your machine.
java run time compile(?) the bytecode again for your machine. (difference jdk, difference output difference machine code)
we install difference jre for difference machine(window, mac os, etc)
so java code write and compile (become bytecode) in window can run in mac.

for some other programming language, compiler compile to machine code directly.
and window can not read code complied in mac(may be)


security...
read http://java.sun.com/javase/6/docs/te...ides/security/ may help

And the followings too, cryptography...

Java SE Security

Thanks... i got how java is secure than others

Quote:

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Originally Posted by makpandian

Thanks... i got how java is secure than others

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But not at all, based on the application/process you want to develop each language have advantages as well as disadvantages in contest of security. ;) But in most of the cases Java is in top level.