System.out.println(); 执行

Question

Can anyone here tell me how System.out.println() is implemented? I have tried many sites but didn't get any satisfactory answer.

Answer 1

In System.out.println,

• System is a final class.
• out is object of PrintStream class inside system.
• println() is a method of PrintStream

So to print something we need to call a println which is inside PrintStream class whose object is inside System class.Hence System.out.println();

For more information refer following link