java - 为什么从一种类型到相同类型的赋值需要检查？

Question

我在类里面运行 IntelliJ 的代码分析器 (IntelliJ 11.1.4) 并收到此警告:

Unchecked assignment: 'java.util.List' to 'java.util.List '

它提示的代码是:

List<String> targetDocumentIds = pepperWorkflowInstance.getTargetDocumentIds();

供引用:

public class PepperWorkflowInstance<T extends PepperWorkflowInstanceData> implements Serializable {

   private List<String>            targetDocumentIds = new ArrayList<String>();
   ...
   public List<String> getTargetDocumentIds() {
      return targetDocumentIds;
   }
   ...
}

所以类型匹配...那么为什么我需要“检查”分配？

Answer 1

确保 pepperWorkflowInstance 有参数:

pepperWorkflowInstance = new PepperWorkflowInstance<SomeClass>();

参见 IDEA-6254 .