Update cheatsheets

javac

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# javac
+
+> Java application compiler.
+> More information: <https://docs.oracle.com/en/java/javase/20/docs/specs/man/javac.html>.
+
+- Compile a `.java` file:
+
+`javac {{path/to/file.java}}`
+
+- Compile several `.java` files:
+
+`javac {{path/to/file1.java path/to/file2.java ...}}`
+
+- Compile all `.java` files in current directory:
+
+`javac {{*.java}}`
+
+- Compile a `.java` file and place the resulting class file in a specific directory:
+
+`javac -d {{path/to/directory}} {{path/to/file.java}}`