What does write once run anywhere means for Java?

Answer 1

This phrase describes Java's platform independence. You can write a piece of code on a Windows machine and run it (without making any code changes) on a Mac, Linux, or any other Java-supported platform.

You write the code once and can run it anywhere.

That means that if u write a program in JAVA, then u may run it on any computer which facility is not available in most of the languages.

Then how does JAVA do this?

to understand this, you need to understand how a compiler/interpreter converts a code to an executable file.

When u specify int x; in C/C++,

it creates a memory allocation on your RAM depending upon the processor you have in your computer(32 bt or 64 bit or 16 bit(obsolete)).

but what if your computer has a Intel Pentium (32 bit) and my computer has Intel Core 2 Duo(64 bit)?

the Code fails to execute on my computer if You have created the code in your computer and vice-versa.

But JAVA codes never face these problems as it makes a byte-code

before it makes an executable file.

And this byte-code checks for the processor of your computer first and accordingly sets int x which is most compatible on your Computer.

Answer 2

That means that if u write a program in JAVA, then u may run it on any computer which facility is not available in most of the languages.

Then how does JAVA do this?

to understand this, you need to understand how a compiler/interpreter converts a code to an executable file.

When u specify int x; in C/C++,

it creates a memory allocation on your RAM depending upon the processor you have in your computer(32 bt or 64 bit or 16 bit(obsolete)).

but what if your computer has a Intel Pentium (32 bit) and my computer has Intel Core 2 Duo(64 bit)?

the Code fails to execute on my computer if You have created the code in your computer and vice-versa.

But JAVA codes never face these problems as it makes a byte-code

before it makes an executable file.

And this byte-code checks for the processor of your computer first and accordingly sets int x which is most compatible on your Computer.