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dan's sigle topic--arrays

 
Ranch Hand
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class A {public String toString() {return "A";}}
class B {
public static void main(String[] arg) {
A[] a1 = new A[1]; // 1
A[][] a2 = new A[2][]; // 2
A[][][] a3 = new A[3][][]; // 3
a1[0] = new A(); // 4
a2[0] = a2[1] = a1; // 5
a3[0] = a3[1] = a3[2] = a2; // 6
System.out.print(a3[2][1][0]); // 7
}
}
What is the result of attempting to compile and run the above program?

This is a question in dan's single topic exams. The answer is "A". I have a question.
when I compile and run the program, i get a runtime exception saying that there is no such method in the main. Now what does that mean ?
Pls help...
 
Greenhorn
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The problem could be you might have stored the two classes in one file. If you store the class A in a file A.java and class B in B.java, you do not get any problem and the result is "A".
 
Greenhorn
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or make class B public and save file as B.java.
 
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Hi.
Save the file as "B.java". (Note the capitalization!)
You need the classname ("B") as the filename to invoke its main() method with the JVM, but you don't need to separate the file into separate files, or change any of the access modifiers.
Regards,
Jeff
 
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