I do not see a big programs have been designed Java by ! ???? So why is the Java language powerful ! And also suffers from non standard gui !?

Answer 1

One of the big powers of Java is that it runs everywhere. You can code it once in a PC, and then it'll work on Mac and Linux, too.

Answer 2

Why, many huge games and softwares are programmed in java!! Google it and you will see the reality

Answer 3

Maybe you don't know it, but Java is everywhere:
https://go.java/index.html?intcmp=gojava-banner-java-com

Do you know something about videogames' world? Minecraft is programmed with java!

Java has different GUI's to start from but you can code a new one too.