What is this? -- unchecked call to put(K,V)

Question

unchecked call to put(K,V) as a member of the raw type java.util.HashMap
m.put( args[0], new Double( args[1]));
I have code that stores a string and a double value in a map like this:
String args[];
m.put( args[0], new Double( args[1]));
but I get this message when compiling with the Xlint option in javac. Why is this happening?

Answer 1

Yes. I got the same compile warning when I compile with jdk1.5[jdk-1_5_0_03-windows-i586-p.exe]
This:
Map map=new HashMap();
map.put("abc","def");Will get the warning like "unchecked ....."
====
This:
Map<Object,Object> map=new HashMap<Object,Object>();
map.put("abc","def");Will compile OK.
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Is the compiler's responsible to set the default type to Object?