Monday, June 27, 2011

Simplified varargs method invocation

This was a very tricky one to investigate. It’s still not clear what ‘simplified varargs method invocation’ is referring to but one difference (improvement) I was able to narrow down was that of a more specific and helpful warning that jdk7 adds to certain varargs code as below.

import java.util.Collections;
import java.util.List;
import java.util.Map;

public class BetterVarargsWarnings {

    static <T> List<T> foo(T... elements) {
        return null;

    static List<Map<String, String>> bar() {
        Map<String, String> m = Collections.singletonMap("a", "b");
        return foo(m, m, m);


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