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JAVA Strings

JAVA Strings
What is the output of the following println statement?String str1 = "Hellow";System.out.println(str1.indexOf('t'));

-1
false
1
true
0

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JAVA Strings
What could be output of the following fragment of code?public class Test{ public static void main(String args[]){ String x = "hellow";int y = 9;System.out.println(x += y); } }

9hellow
hellow9
Throws an exception as string and int are not compatible for addition
Compilation error
None of these

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JAVA Strings
Determine output:public class Test{ public static void main(String args[]){ String str = null; if(str.length() == 0){ System.out.print("1"); } else if(str == null){ System.out.print("2"); } else{ System.out.print("3"); } }}

"2" is printed.
"3" is printed.
Compilation fails.
"1" is printed.
An exception is thrown at runtime.

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JAVA Strings
What will be the output?String str1 = "abcde";System.out.println(str1.substring(1, 3));

abcd
bcd
abc
bc
None of these

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JAVA Strings
String str1 = "Kolkata".replace('k', 'a');In the above statement, the effect on string Kolkata is

All characters a are replaced by k.
All characters k are replaced by a.
Displays error message
The first occurrence of k is replaced by a.

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JAVA Strings
What will be the output?public class Test{ public static void main (String[] args){ String test = "a1b2c3"; String[] tokens = test.split("\\d"); for(String s: tokens) System.out.print(s); } }

123
Runtime exception thrown
abc
Compilation error

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