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JAVA Strings

JAVA Strings
How many Constructor String class have?

7
None of this
11
2
13

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JAVA Strings
toString() method is defined in

java.lang.util
java.lang.String
java.lang.Object
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"); } }}

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

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

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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); } }

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

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

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

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