serialization - Java unchecked or unsafe operations message -


i getting following error when compiling java class in bluej.

auctionmanager.java uses unchecked or unsafe operations.

this error displayed when following deserialization code in 1 of functions:

try {   objectinputstream in = new objectinputstream(new fileinputstream(filename));   arraylist<auctionitem> auctionlist = (arraylist<auctionitem>) in.readobject();   in.close(); } catch (exception e) {   e.printstacktrace(); }

can please have information why error being displayed, , use deserialization code without error.

first message not error, warning; doesn't prevent program compiling, or running.

as source, line:

arraylist<auctionitem> auctionlist = (arraylist<auctionitem>) in.readobject();

since casting object (readobject returns object) parameterized type (arraylist<auctionitem>).


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