setup intellij to ask type parameter when using generics in java

Question

I'm new to IntelliJ IDEA. I used to use Eclipse.

By default, IntelliJ doesn't ask to give parameter type for Java Generics Type.

// Following code doesn't give any warning
List list = null;

// I want to make IntelliJ ask me to specify type parameter (say Long)
List<Long> list = null; // i.e  If I want a List of Long

How can I set up IntelliJ so that it ask me to give generic type parameters while using generics java types?

I'm using JDK 8 if it matters.

Answer 1

IntelliJ provide an inspection name Raw use of parameterized class

After enabling that inspection.

Answer 2

In the Project Structure menu, under Project, check the language level setting. Setting it to 6.0 will cause the IDE to give you an error when you are missing the identifier in the diamond block.

Setting it to 7.0 or higher will suppress it.

Addition based on further exchange:

Under File -> Settings -> Inspections -> General if the box that says Unchecked warning is checked, when you run Analyze -> Inspect code, it will report the condition noted under General -> Unchecked warnings as "Unchecked call to add(E) as a member of raw type 'java.util.List'", in this example. If you declare the generic type of List explicitly, this warning will not show up in the report.

Answer 3

I am not aware of a way to get it to do exactly what you are asking for; however, once you would instantiate your List and then add an element to it IntelliJ will mark it with a yellow squiggly line and warn you it was unchecked. If you would put your cursor anywhere on the yellow squiggly and press Alt-Enter it will offer you "Try to generify YourClassName", press enter and it will infer the type and modify your code.

Before:

After: