Java Unused Variables Remover

CLI tool which removes unused variables in Java source code

Java source code should be Java 17 compatible

Tool operates with one Java file

NB: tool also removes unused public properties in classes and interfaces

Note: tool removes only variables which were unused before transformation, but not after it:

class Main {

    void f() {
        int x = 3;
        int y = x;
    }
}

Will become

class Main {

    void f() {
        int x = 3;
    }
}

Not

class Main {

    void f() {
    }
}

Build and run

./gradlew installDist
./build/install/remove-unused/bin/remove-unused

Usage

Usage: remove-unused [OPTIONS] [INPUT_FILE]

Options:
  -r, --raw          Enables saving original layout of code
  -o, --output PATH  File to save result
  -h, --help         Show this message and exit

If input file is not specified, tool will read Java code from STDIN

If output file is not specified, tool will print result to STDOUT

Example

$ cat Main.java
public class Main {
    int x;

    void f() {
        int x = 3;
        int y = x;
        int z = this.x;
    }
}

interface I {
    int y = 1;
}
$ ./build/install/remove-unused/bin/remove-unused Main.java
public class Main {

    int x;

    void f() {
        int x = 3;
    }
}

interface I {
}