Java Reference
In-Depth Information
}
catch
catch
(
ClassCastException ex
) {
System
.
out
.
println
(
"Did get expected exception."
);
}
// Removed the brokenness, print rest of it.
while
while
(
ms2
.
hasNext
()) {
String name
= (
String
)
ms2
.
pop
();
System
.
out
.
println
(
name
);
}
}
}
Because of this potential for error, the compiler warns that you have unchecked raw types.
Like the deprecation warnings discussed in
Dealing with Deprecation Warnings
,
by default,
these warnings are not printed in detail by the
javac
compiler (they will appear in most
IDEs). You ask for them, with the rather lengthy option
-Xlint:unchecked
:
C:>
javac -source 1.5 structure/MyStackDemo.java
Note: MyStackDemo.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
C:>
javac -source 1.5 -Xlint:unchecked structure/MyStackDemo.java
MyStackDemo.java:14: warning: unchecked call to push(T) as a member of the raw
type MyStack
ms2.push("billg");
^
MyStackDemo.java:15: warning: unchecked call to push(T) as a member of the raw
type MyStack
ms2.push("scottm");
^
MyStackDemo.java:16: warning: unchecked call to push(T) as a member of the raw
type MyStack
ms2.push(new java.util.Date( ));
^
3 warnings
C:>
