public class Test {
    private final String myField;

    public Test(String myField) {
        this.myField = myField;
    }
}

error: [StrictUnusedVariable] The field 'myField' is never read. Intentional occurrences are acknowledged by renaming the unused variable with a leading underscore. '_myField', for example.
    private final String myField;
                         ^

public class Test {
    private final String _myField;

    public Test(String myField) {
        this._myField = myField;
    }
}

error: [StrictUnusedVariable] The field '_myField' is read but has 'StrictUnusedVariable' suppressed because of its name.
    private final String _myField;
                         ^