Question

My problem is about Java / Android :

I created a class MyClass which has a method getAllData() that returns an List<MyType> = new ArrayList<MyType>(). In an other class MyOtherClass I call to this method and want to write the returned List into another List<MyType>.

But I get the following error: Unhandled exception type Exception

What can I do about this?

Here’s the code:

MyClass.java

 public List<MyType> datas = new ArrayList<MyType>();

public List<MyType> getAllData() throws Exception{

//add some things to datas... 

return datas;
}

MyOtherClass.java

 public void fetchData(){

    MyClass mydatas = new MyClass();
    List<MyType> thedatas = mydatas.getAllData();

 }

How can I solve the problem?
With an “try / catch(Exception e)” surrounding the statement, it seems not to get the returned List from getAllData();

Thanks a lot in advance!

Answer 1

Since getAllData() might throws a checked exception (i.e., an exception that is not a RunTimeException), you have to surround the statement with try-catch

public void fetchData() {
    MyClass mydatas = new MyClass();
    try {
        List<MyType> thedatas = mydatas.getAllData();
    } catch (Exception ex) {
        // display or log exception name
    }
}

Or add throws clause after the method name.

public void fetchData() throws Exception {
    MyClass mydatas = new MyClass();
    List<MyType> thedatas = mydatas.getAllData();
}