In the lab of "Tour of java.lang.* classes"
(0.5) StringBufferDemo class
System.out.println("substring (1st two characters): "
+ sb.substring(0, 3));
(0.6) StringBuilderDemo class
System.out.println("substring (1st two characters): "
+ sb.substring(0, 3));
Both the above codes gets 3 characters, it should be
System.out.println("substring (1st two characters): "
+ sb.substring(0, 2));
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