Interview Questions on Java coding

1)what is the output?

String s="Test";
s=s.substring(1,1);

syso(s)

Ans: print nothing

2)String s="Test";

s.contains("");

Ans: True

3)what is the output?

String s="Test";

String k=s.concats(null);

sysout(k)

Ans: NullPointerException

4)what is the output?

String sp="Java String Split";

                String sp1[]=sp.split("\\s",1);

                

                System.out.println(sp1[0]);

Ans:Java String Split

5) how to print the 2nd table or any table of maths in SQL?

2*1=2

2*2=4

2*3=6

.....

.....

2*10=20

Ans:SELECT '2*'||to_char(level)||'='||to_char(2*LEVEL) FROM dual CONNECT BY LEVEL < 11

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