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What is the purpose of setAutoCommit() ?
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Answer / shahnawaz sheikh
If AutoCommit is off, then any update or insert operation
perforned on database will not be reflected just after the
query is executed.Though the operation has been
successfully completed.
We will have to commit the transaction manually, to view
the incurred changes.
This also keeps user on the safer side, if some
undesirable row has been inserted,updated or deleted in the
database then it can be rollback.
While if the AutoCommit is on any update,insert or delete
are at once reflected onto the database.
| Is This Answer Correct ? | 13 Yes | 1 No |
public class AboutStrings{ public static void main(String args[]){ String s1="hello"; String s2="hel"; String s3="lo"; String s4=s2+s3; //to know the hash codes of s1,s4. System.out.println(s1.hashCode()); System.out.println(s4.hashCode()); // these two s1 and s4 are having same hashcodes. if(s1==s4){ System.out.println("s1 and s4 are same."); }else System.out.println("s1 and s4 are not same."); } } Somebody told me that, == operator compares references of the objects. In the above example even though s1 and s4 are refering to same object(having same hash codes), it is printing s1 and s4 are not same. Can anybody explain in detail why it is behaving like this? Thanks in Advance RavuriVinod
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