Indicates that the called method is not supported or is not available. Typically, this exception is caused by attempting to perform a modification operation on a collection or object that does not support modification. The way to resolve this exception depends on the specific context and code.
Here are some suggestions to solveUnsupportedOperationException：
1. Check the document:First, check the official documentation of the relevant classes or methods. Documentation usually explicitly states which operations are supported and which are not. Make sure the action you are trying is legal in that context.
2. Use variable collections:If you are using immutable sets (e.g.), consider switching to a variable set for modification operations. Immutable collections usually do not support modification operations.
// Create a mutable list from an immutable listList<String> mutableList = new ArrayList<>(immutableList);
3. Use collection classes that support modification:Make sure the collection class you are using supports modification operations. For example,The created list is immutable, andArrayListis variable.
// Use collection classes that support modificationList<String> mutableList = new ArrayList<>((array));
4. Avoid using immutable objects:If you encounter this exception in a custom class, make sure your class or object supports the required modification operations. Consider modifying the design of the class to support your operations.
5. Use the iterator to delete the element:If you encounter it while traversing the collectionUnsupportedOperationException, consider using an iterator to delete elements instead of calling the delete method of the collection directly.
Iterator<String> iterator = ();
while (()) {
if (condition) {
();
}
}
6. View source code:When encountering this exception, check the source code of the relevant class for more context information. This can help you understand why the operation is not supported.
solveUnsupportedOperationExceptionThe method depends on the specific situation. Double-check your code to make sure that the actions you perform on the collection or object are legal, and if modification is required, make sure that you are using objects or collections that support modification.
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