怎么处理Raw use of parameterized class
时间: 2023-09-27 19:09:07 浏览: 52
这个警告通常出现在使用泛型类时,没有指定泛型类型参数。要解决这个警告,可以在使用泛型类时指定泛型类型参数,例如:
```
List<String> list = new ArrayList<>();
```
另外,如果你确定使用的泛型类型参数是正确的,也可以使用@SuppressWarnings注解来忽略这个警告:
```
@SuppressWarnings("rawtypes")
List list = new ArrayList();
```
相关问题
Raw use of parameterized class
The raw use of a parameterized class refers to using the class without specifying the type parameter. In languages like Java or C#, parameterized classes allow you to create classes that can work with different types. However, if you use the class without specifying the type parameter, it is considered a raw use.
For example, let's say we have a generic class called `Box` that can hold any type of object:
```java
public class Box<T> {
private T value;
public void setValue(T value) {
this.value = value;
}
public T getValue() {
return value;
}
}
```
If we use this class without specifying the type parameter, it becomes a raw use:
```java
Box box = new Box(); // Raw use of Box
box.setValue("Hello"); // No type safety
String value = (String) box.getValue(); // Type casting required
```
In the above example, `Box box = new Box();` is a raw use because we are not specifying the type parameter. This results in the loss of type safety, as we can assign any type of value to the `value` field without any compiler checks. We also need to perform explicit type casting when retrieving the value.
It is generally recommended to avoid raw uses of parameterized classes as they bypass the type safety provided by generics and can lead to runtime errors or unexpected behavior.
Raw use of parameterized class 'ResponseDTO'
The "Raw use of parameterized class 'ResponseDTO'" error typically occurs when a generic class or interface is being used without specifying the type argument. In Java, parameterized classes allow you to define classes that can work with different data types.
To resolve this error, you need to specify the type argument when using the generic class or interface. For example, if you have a class called `ResponseDTO` that takes a type parameter, you need to provide the actual type when creating an instance of that class.
Here's an example of how you can fix the error by specifying the type argument for the `ResponseDTO` class:
```java
ResponseDTO<String> response = new ResponseDTO<>();
```
In this example, the type argument `<String>` specifies that the `ResponseDTO` class will work with `String` objects.
By providing the type argument, you ensure that the generic class is used correctly and avoid the "Raw use of parameterized class" error.