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Java.lang Class - Programming

Q1:

What will be the output of the program? 
String d = 'bookkeeper';
d.substring(1,7);
d = 'w' + d;
d.append('woo');  /* Line 4 */
System.out.println(d);

A wookkeewoo

B wbookkeeper

C wbookkeewoo

D Compilation fails.

ANS:A - wookkeewoo

In line 4 the code calls a StringBuffer method, append() on a String object.