Java String Handling Test – 3

1. What will be the output of the following Java program?

   
    class output 
    {
        public static void main(String args[])
        { 
           String c = "  Hello World  ";
           String s = c.trim();
           System.out.println("\""+s+"\"");
        }
    }

2. What will be the output of the following Java program?

 
    class output 
    {
        public static void main(String args[])
        { 
           String s1 = "one";
           String s2 = s1 + " two";
           System.out.println(s2);
        }
    }

3. What will be the output of the following Java program?

 
    class output 
    {
        public static void main(String args[])
        {
           String s1 = "Hello World";
           String s2 = s1.substring(0 , 4);
           System.out.println(s2);
        }
   }

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

5. What will s2 contain after following lines of Java code?

 String s1 = "one";
String s2 = s1.concat("two")

6. What is the value returned by function compareTo() if the invoking string is greater than the string compared?

7. What will be the output of the following Java program?

 
    class output 
    {
        public static void main(String args[])
        { 
           String s1 = "Hello";
           String s2 = s1.replace('l','w');
           System.out.println(s2);
        }
    }

8. Which of this method of class String is used to extract a substring from a String object?

9. What will be the output of the following Java program?

    class output 
    {
        public static void main(String args[])
        {             String s = "Hello World";
             int i = s.indexOf('o');
             int j = s.lastIndexOf('l');
             System.out.print(i + " " + j);
 
        }
   }

10. Which of the following statement is correct?