String Quiz

Which of these class is superclass of String class?

• java.util

• java.lang

• ArrayList

• None of the mentioned

Which of these operators can be used to concatenate two or more String objects?

• +

• +=

• &

• ||

Which of these method of class String is used to obtain length of String object?

• get()

• Sizeof()

• lengthof()

• length()

Which of these method of class String is used to extract a single character from a String object?

• CHARAT()

• charat()

• charAt()

• ChatAt()

Which of these constructors is used to create an empty String object?

• String()

• String(void)

• String(0)

• None of the mentioned

Which of these method of class String is used to compare two String objects for their equality?

• equals()

• Equals()

• isequal()

• Isequal()

Which of these method of class String is used to extract a substring from a String object?

• SubString()

• Substring()

• substring()

• None of the mentioned

What will s2 contain after following lines of code?

String s1 = “one”;

String s2 = s1.concat(“two”)

• one

• two

• onetwo

• twoone

Which of these method of class String is used to remove leading and trailing whitespaces?

• startsWith()

• trim()

• Trim()

• doTrim()

What does the following print? int row = 1;

do

{

int col = 1;

do

{

System.out.print( "*" );

col++ ;

}

while ( col <= row );

System.out.println();

row++ ;

}

while ( row <= 3 );

• *

  **

  ***

• ***

  **

  *

• ******

  *****

  ****

  ***

  **

  *

• ****

  ****

  ****