Question on when toString() method is called

[Veena Pointi]

class JLT{

public String toString(){
System.out.println("Inside String method");
return " ";
}

public static void main(String[] args){
StringBuilder sb=new StringBuilder("Krishna");

System.out.println(sb);

JLT j=new JLT();
System.out.println(j);
}
}

The above code prints
Krishna
Inside String method

I umderstand StringBuilder has it's own toString method so it calls that method and prints Krishna . I am trying to find out what triggers calling of toString method. println method calls toString method on the argument that is passed ? I checked API .println method actually calls Strin.valueOf methos on the argument that is passed. Can someone explain and trace how exactly toString method is called ?

Thanks,
Veena

[Ron McLeod]

Veena Pointi wrote:Can someone explain and trace how exactly toString method is called ?

According to the documentation for String.valueOf(Object obj), if the argument is null, then a string equal to "null" [is returned]; otherwise, the value of obj.toString() is returned.

[Veena Pointi]

Oh! I don't know how did I miss to read this ,although I thoroughly read few times. Thank you very much Ron.