The type of int.class is Class<Integer>.

This basically destroys the type safety purported by type tokens:

import java.util.*;

class Test {
    public static void main(String[] args) {
        Collection<Integer> c = new Vector<Integer>();
        c = Collections.checkedCollection(c, int.class);
        c.add(0);
    }
}

This program fails:
Exception in thread "main" java.lang.ClassCastException: Attempt to insert class java.lang.Integer element into collection with element type int
        at java.util.Collections$CheckedCollection.typeCheck(Collections.java:2206)
        at java.util.Collections$CheckedCollection.add(Collections.java:2240)
        at Test.main(Test.java:7)
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