Import files of the same hierarchy in Java

It seems that the idea of package is necessary.

It seems easy to think of package = directory.

Put the main .java file in a folder.

Put this at the beginning of Test1.java where main () is located

package test1;

Then, ** MyTest1Exception.java ** in the same layer can be read without importing anything.

	void runSample() throws MyTest1Exception {
                    ...
			throw new MyTest1Exception("Unique exception");

reference https://itsakura.com/java-dokuji-reigai

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