JVM 内存

1 、Java 中打日志会产生 String 变量吗？ 2 、如果会产生，那是不是会占用堆空间？又是如何回收的？

代码：

private void logout(ProceedingJoinPoint point, Object result, long begin, String title) {
        MethodSignature methodSignature = (MethodSignature) point.getSignature();
        log.info("[{}] method: [{}]  request: [{}]  response: [{}]  cost: [{}ms ] ",
                title
                , Optional.ofNullable(methodSignature)
                        .map(MethodSignature::getMethod)
                        .map(Method::getName)
                        .orElse(""),
                JSON.toJSONString(point.getArgs()),
                JSON.toJSONString(result),
                System.currentTimeMillis() - begin);
    }

日志：ch.qos.logback:logback-core:jar:1.2.3:compile