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JAVA Strings

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

abcd
bc
None of these
abc
bcd

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JAVA Strings
The output of the following fraction of code ispublic class Test{ public static void main(String args[]){ String s1 = new String("Hello");String s2 = new String("Hellow");System.out.println(s1 = s2);}}

Hello
None of these
Throws an exception
Compilation error
Hellow

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

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

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JAVA Strings
What will be output?String S1 = "S1 ="+ "123"+"456";String S2 = "S2 ="+(123+456);

S1=579,S2=579
S1=123456, S2=579
None of This
S1=123456,S2=123456

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JAVA Strings
What will be the output of the following program code?public class Test{ public static void main(String args[]){ String s = "what"; StringBuffer sb = new StringBuffer("what"); System.out.print(sb.equals(s)+","+s.equals(sb)); }}

None of these
false,false
false,true
true,true
true,false

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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); } }

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

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