Java NetBeans编译错误

Question

When compiling my Code, it highlights this in red:

    Note: /Users/myName/NetBeansProjects/CardGame/src/cardgame/Hand.java uses unchecked or unsafe operations.
    Note: Recompile with -Xlint:unchecked for details.

It still compiles and runs the program without fault (so far)... I was just curious to whether anyone would know whats causing it. Absolutely nothing appears on google and looking at my "Hand" Class, i can not see anything that should be causing an issue... :(

Answer 1

In Netbeans, right click on your project > Properties > Compiling > "Additional Compiler Options" and enter: -Xlint:unchecked .

Recompile and see what line is generating the warning.

Answer 2

These are not compilation errors, they are some warnings. They say that you are not using generics or using them in a wrong way somewhere in your code.

For instance, something like this:

List list = new ArrayList();

should be:

List<String> list = new ArrayList<String>();