java - Can I convert the following code to use generics? -

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i'm converting application use java 1.5 , have found following method:

  /**    * compare 2 comparables, treat nulls -infinity.    * @param o1    * @param o2    * @return -1 if o1<o2, 0 if o1==o2, 1 if o1>o2    */   protected static int nullcompare(comparable o1, comparable o2) {     if (o1 == null) {       if (o2 == null) {         return 0;       } else {         return -1;       }     } else if (o2 == null) {       return 1;     } else {       return o1.compareto(o2);     }   }

ideally make method take 2 comparables of same type, possible convert , how?

i thought following trick:

protected static <t extends comparable> int nullcompare(t o1, t o2) {

but has failed rid of warning in intellij "unchecked call 'compareto(t)' member of raw type 'java.lang.comparable'" on line:

return o1.compareto(o2);

change to:

protected static <t extends comparable<t>> int nullcompare(t o1, t o2) {

you need because comparable generic type.


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