求将php代码转成java代码

function hexToStr(){
        $hex = 
        hash('sha256', base64_encode('ewfewfefewfewfew')
        , true);
        $string='';
        for ($i=0; $i < strlen($hex)-1; $i+=2){
            $string .= chr(hexdec($hex[$i].$hex[$i+1]));
        }
        return $string;
}

这段代码求转成java,谢谢

https://bbs.csdn.net/topics/370087139