Eclipse:the selection cannot be launched,and there is no recent launches

Just installed eclipse, so you want to write a Java program to try. After the results are written, either click the Run or debug results will pop up a window, the content is: The selection cannot be launched,and there is no recent launches! This means that the option cannot be executed and the record has not been executed recently.

This is the Java program I wrote :

　　

Later on the internet for a long time did not find the answer I want. It's all about: Select Run and click Execute Run as application. Then I clicked run and did not find the run as application. It was later discovered because of a grammatical problem that caused the error.

Corrected Java program:

　　

Summing up, the appearance of the selection cannot be launched,and there is no recent launches! Problem:

1, the first to determine the grammar has no problem, the program does not appear red wavy line does not mean that there is no problem.

　　

2, Grammar without problems , select the file to be executed, right click, select Run, click Execute Run as application.

Procedures to be executed after correction:

　　

Eclipse:the selection cannot be launched,and there is no recent launches