Question: What is wrong with the following code? public class Foo { private int num; public Foo(int a1) { num = a1; } } public class

What is wrong with the following code?

public class Foo

{

private int num;

public Foo(int a1)

{

num = a1;

}

}

public class FooTest

{

Foo foo = new Foo(3, 4);

}

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