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Qs about toString()

 
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Hi,
Could some one explain why the overriding toString() in class A1 was not called as it is being called on class B1?
note : A1, B1 on different files.
thanks
chi-chih
class A1 {
public static void main(String args[]) {
Integer a = new Integer(7);
System.out.println("A1 : "+ a);
}

public String toString () {
return " from toString()in A1";
}
}
class B1 {
public static void main(String args[]) {
Integer b = new Integer(7);
System.out.println("B1 : "+ new B1()+b);
}

public String toString () {
return " from toString() in B1";
}
}
 
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The overridden method toString() is not called in A1 because you override it in class A1 and you never instantiate a A1 object. Instead you instantiate an Integer object so it's toString method is called.
In the B1 class you create an instance, so that instance uses it's overridden toString method to covert itself to a String.

[This message has been edited by Sean Casey (edited September 08, 2001).]
 
chi Lin
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Sean,
Thank you for the explanation.
chichih
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