Quiz on Java String

1. class Sample {

public static void main ( String args [ ] )

{

String text = “DataFlair”;

system.out.println(text.length());

}

}

 class Example {

public static void main ( String args [ ] )

{

String s = new String();

system.out.println(s);

}

}

class StringExample {

public static void main ( String args [ ] ) 

{ 

Char data[] = { “h” , “e” , “l” , “o” , “o” };

String s = new String(data);

system.out.println(s);

}

}

class StringProgram {

public static void main ( String args [ ] )

{

String one = “Data”;

Char a = { ‘F’ , ‘l’ , ‘a’, ‘i’, ‘r’ };

String two = new String(a);

system.out.println(one.concat(two));

}

}

Which of the following is not a way to declare a string in Java ?

 class CompareExample {

public static void main ( String args [ ] )

{

String First = “Data”;

String Second = “Flair”;

if(First.isequals(Second) {

system.out.println(“These two strings are equal”);

} else {

system.out.println(“These two strings are not equal”);

}

}

}

 class SplitExample {

public static void main ( String args [ ]  )

{

String datas = “DataFlair , ”webservices”;

String data[] = datas.split(“,”);

system.out.println(Arrays.toString(data));

}

}

Which of the following is the correct syntax to compare two strings ?

class TrimExample {

public static void main ( String args [ ] ) 

{

String text = “Hello World !”;

String originalvalue = text.trim();

system.out.println(originalvalue.length());

}

}

 class UpperCase {

public static void main( String args [ ] )

{

String data = “dataflair”;

String a = data.charAt(0).toUpperCase();

String b = data.charAt(1);

String c = data.charA(2);

String d = data.charAt(3);

String e = data.charAt(4).toUppercase();

String f = data.charAt(5);

String g = data.charAt(6);

String h = data.charAt(7);

String i = data.charAt(8);

system.out.println(a+b+c+d+e+f+g+h+i);

}

}

class Index {

public static void main ( String args [ ] ) 

{

String s = “World”;

int a = s.indexof(‘r’);

system.out.println(a);

}

}

class GetBytes {

public static void main ( String args [ ] ) 

{

String text = “ABCD”;

int a = text.charAt(3).getBytes();

system.out.println(a);

}

}

class GetBytes {

public static void main ( String args [ ] ) 

{

String text = “ABCD”;

int a = text.charAt(3).getBytes();

system.out.println(a);

}

}

Which of the following methods in Java is used to return a formatted output?

class AddingString {

public static void main (String args [ ] )

{

String a = “9”;

String b = “9”;

String c = a + b ;

system.out.println(c);

}

}

Why toChararray() method used in Java?