Cannot resolve method 'orElseThrow' in 'AdPosition'
时间: 2024-01-27 18:03:35 浏览: 37
这个错误通常是因为你的AdPosition类中没有定义`orElseThrow`方法。`orElseThrow`是Java 8中Optional类的一个方法,它可以在Optional对象为空时抛出一个异常。
如果你想在AdPosition对象为空时抛出一个异常,你可以使用以下代码:
```
AdPosition adPosition = // 获取 AdPosition 对象
AdPosition nonNullAdPosition = Optional.ofNullable(adPosition)
.orElseThrow(() -> new RuntimeException("AdPosition对象为空"));
```
如果你想要了解更多关于Java 8中Optional类的内容,可以查看官方文档: https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html
相关问题
cannot resolve method error in logger
The "cannot resolve method" error in a logger indicates that the method being called does not exist in the logger's class or in any of its superclasses. This error can occur if you are using an outdated version of the logger or if you have misspelled the method name.
To resolve this error, make sure that you are using the correct version of the logger and that you have spelled the method name correctly. You can also check the logger's documentation or source code to ensure that the method you are trying to call actually exists.
AdPosition position = adPositionMapper.selectByPrimaryKey(advertDto.getPositionId()) .orElseThrow(() -> new RuntimeException("Ad position not found"));报错Cannot resolve method 'orElseThrow' in 'AdPosition'
这个错误是因为`AdPosition`对象没有实现`Optional`接口,所以不能使用`orElseThrow`方法。你需要使用`ifPresent`方法来判断`AdPosition`对象是否存在,如果存在就执行指定的操作,如果不存在就跳过。例如:
```
Optional<AdPosition> adPosition = adPositionMapper.selectByPrimaryKey(advertDto.getPositionId());
if (adPosition.isPresent()) {
AdPosition position = adPosition.get();
// 这里是存在AdPosition对象的代码逻辑
} else {
throw new RuntimeException("Ad position not found");
}
```
或者你也可以使用`orElseThrow`方法来抛出自定义的异常,但需要将`AdPosition`对象转换为`Optional`类型。例如:
```
AdPosition position = adPositionMapper.selectByPrimaryKey(advertDto.getPositionId())
.map(Optional::ofNullable)
.orElseThrow(() -> new RuntimeException("Ad position not found"));
```
这种方式可以让你在一行代码中完成对`AdPosition`对象的查找并抛出异常的操作。
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