Welcome to Stack Overflow in Russian!text information is better to attach as text: a) easier to read;b) can be copied;c) the search works.You can correct the question text by clicking below to edit the question text - aleksandr barakin
Judging by the message, you are compiling the project, but do not run it. - Sergey Gornostaev
Try differently: String a = "Hello world!"; System.out.println(a);String a = "Hello world!"; System.out.println(a); - YagorG
@YagorG How can adding a variable help? - Sergey Gornostaev
one
@alexanderbarakin, in this case, the screenshot is better. - Qwertiy ♦
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The problem was solved by itself, no action was taken. A few days later I launched the project again and it all worked. Probably, programming is magic)
String a = "Hello world!"; System.out.println(a);String a = "Hello world!"; System.out.println(a);- YagorG