Description Markus Keller 2005-01-21 06:21:20 EST

I20050118-1015

The compiler allows to override a method with an array parameter by a method
with a vararg parameter.

In contrast, javac says:
- warning: runall(java.lang.Runnable...) in p.Sub cannot override
runall(java.lang.Runnable[]) in p.Top; overridden method has no '...'
- warning: runall(java.lang.Runnable[]) in p.Sub2 cannot override
runall(java.lang.Runnable...) in p.Sub; overriding method is missing '...'

However, both compilers create classfiles in which the methods do override.

------------------------------------------------
package p;

public class A {
    public static void main(String[] args) {
        Runnable r1 = null, r2 = null;
        System.out.println(new Top().runall(new Runnable[] { r1, r2 }));
        System.out.println(new Sub().runall(new Runnable[] { r1, r2 }));
        System.out.println(new Sub().runall(r1, r2));
        System.out.println(new Sub2().runall(new Runnable[] { r1, r2 }));
    }
}

class Top {
    public String runall(Runnable[] runnables) {
        return "Top";
    }
}

class Sub extends Top {
    public String runall(Runnable... runnables) {
        return "Sub, " + super.runall(runnables);
    }
}

class Sub2 extends Sub {
    public String runall(Runnable[] runnables) {
        return "Sub2, " + super.runall(runnables);
    }
}