$javaClass = new JavaClass(
    new InlineReader('File.class', pack('N', 0xCAFEBABE))
);

or
 
$javaClass = new JavaClass(
    new InlineReader('/path/to/TheFile.class', file_get_contents('/path/to/away/TheFile.class'))
);

public function __construct(string $fileName, string $code)

public function getBinaryReader(): BinaryReader

public function getJavaPathName(): string

public function getFileName(): string

public function __toString(): string