Eclipse sets the compiled file .class output path\The reason and solution for not compiling

The original project is placed in the bin directory by default, and there are two ways to change the placement path of the compiled class file:

 

1. Set the output path for the project settings .class

 

右键项目 > Properties > Java Build Path > Source > Default Output Folder

 

 

 

 

The new directory is used to store .class files, and the target/classes directory under the project

 

 

 

 

 

Second, set the global .class file output path

 

Window > Preferences > Java > Build Path > Source and Output Folder

 

At this point, when you create a new project, the .class file will be automatically placed in the set target/classes directory

 

 

 Eclipse does not compile (neither clean nor check Build Automatically can be automatically compiled), generally because there is a jar package that cannot be found in the Build path of your project, it may be because a jar package was introduced before, and now delete it If the path is dropped or moved, there will be a problem of not compiling.

Solution: Open the Build Path of the project, delete the jia package in Libraries and reload it, check Build Automatically, and try it.