Strings
practice.

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);
    }
}

What will be the output of the following Java code?

class output 
{
    public static void main(String args[])
    {
        char ch;
        ch = "hello".charAt(1);
        System.out.println(ch);
    }
}

What will be the output of the following Java program?

class String_demo 
{
    public static void main(String args[])
    {
        int ascii[] = { 65, 66, 67, 68};
        String s = new String(ascii, 1, 3);
        System.out.println(s);
    }
}

Which of these is an incorrect statement?

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);

    }
}

What is the string contained in s after following lines of Java code?

StringBuffer s new StringBuffer("Hello");
s.deleteCharAt(0);

What will be the output of the following Java program?

class output 
{
   class output 
   {
     public static void main(String args[])
     {
        char c[]={'A', '1', 'b' ,' ' ,'a' , '0'};
        for (int i = 0; i < 5; ++i)
        {
               i++; 
               if(Character.isDigit(c[i]))
                   System.out.println(c[i]+" is a digit");
               if(Character.isWhitespace(c[i]))
                   System.out.println(c[i]+" is a Whitespace character");
               if(Character.isUpperCase(c[i]))
                   System.out.println(c[i]+" is an Upper case Letter");
               if(Character.isLowerCase(c[i]))
                   System.out.println(c[i]+" is a lower case Letter");
               i++;
        }
    }
}

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

What will be the output of the following Java code?

class output 
{
    public static void main(String args[])
    {
        char c[]={'a', '1', 'b' ,' ' ,'A' , '0'};
        for (int i = 0; i < 5; ++i)
        {
               if(Character.isDigit(c[i]))
                   System.out.println(c[i]+" is a digit");
               if(Character.isWhitespace(c[i]))
                   System.out.println(c[i]+" is a Whitespace character");
               if(Character.isUpperCase(c[i]))
                   System.out.println(c[i]+" is an Upper case Letter");
               if(Character.isLowerCase(c[i]))
                   System.out.println(c[i]+" is a lower case Letter");
           i=i+3;
        }
    }
}

What will be the output of the following Java program?

class output 
{
    public static void main(String args[])
    { 
         StringBuffer c = new StringBuffer("Hello");
         c.delete(0,2);
         System.out.println(c);
    }
}

What will be the output of the following Java code?

class output 
{
    public static void main(String args[])
    {
         String chars[] = {"a", "b", "c", "a", "c"};
         for (int i = 0; i < chars.length; ++i)
             for (int j = i + 1; j < chars.length; ++j)
                 if(chars[i].compareTo(chars[j]) == 0)
                     System.out.print(chars[j]); 
    }
}

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

In the following Java code, what can directly access and change the value of the variable name?

package test;
class Target 
{
 public String name = "hello";
}

Which of the following statement is correct?

What will be the output of the following Java code?

class output 
{
    public static void main(String args[])
    {
       StringBuffer s1 = new StringBuffer("Hello World");
       s1.insert(6 , "Good ");
       System.out.println(s1);
    }
}

What will be the output of the following Java program?

class output 
{
    public static void main(String args[])
    { 
         StringBuffer c = new StringBuffer("Hello");
         StringBuffer c1 = new StringBuffer(" World");
         c.append(c1);
         System.out.println(c);
    }
}

What will be the output of the following Java program?

class String_demo 
{
    public static void main(String args[])
    {
        char chars[] = {'a', 'b', 'c'};
        String s = new String(chars);
        String s1 = "abcd";
        int len1 = s1.length();
        int len2 = s.length();
        System.out.println(len1 + " " + len2);
    }
}

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

Which of these methods is an alternative to getChars() that stores the characters in an array of bytes?

What will be the output of the following Java code?

public class Boxer1 
{
    Integer i;
    int x;
   public Boxer1(int y) 
   {
        x = i+y;
        System.out.println(x);
   }
   public static void main(String[] args) 
   {
       new Boxer1 (new Integer(4));
   }
}