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The parseObject() method parses text from a string to produce a Number. The method starts the parsing process by parsing the text starting at the index given by pos. If parsing succeeds, then the index of pos is updated to the index after the last character used, and the parsed number is returned. The new pos can be used to indicate the starting point for the next call to this method. Following is the general format of the method:

parseObject public final Object parseObject(String source, ParsePosition pos)

Here, source is a String, part of which should be parsed, pos is a ParsePosition object with index and error index information as described above. This method throws NullPointerException if pos is null.
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The format() method belongs to the NumberFormat class. This method gives specialization of format. Following is the general format of the method:

public final String format(double number)

This method throws ArithmeticException if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY.
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The parse() method parses the text from the beginning of the given string to produce a Number. The method may not use the entire text of the given string. Following is the general format of the method:

public Number parse(String source) throws ParseException

Here, source is a String whose beginning should be parsed and this method returns a Number parsed from the string. This method throws ParseException if the beginning of the specified string cannot be parsed.
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The parse() method parses the text from the beginning of the given string to produce a Number. The method may not use the entire text of the given string. Following is the general format of the method:

public Number parse(String source) throws ParseException

Here, source is a String whose beginning should be parsed and this method returns a Number parsed from the string. This method throws ParseException if the beginning of the specified string cannot be parsed.
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NullPointerException is thrown when an application attempts to use null in a case where an object is required. NullPointerException extends RuntimeException. This exception will be thrown when one of the following conditions is met:

1. A null object of an instance method has been called.
2. The field of a null object has been accessed or modified.
3. The length of null in an array has been taken.
4. The slots of null in an array have been accessed or modified.
5. Null is thrown as if it were a Throwable value.

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The default and protected access modifiers are identical modifiers with only one difference.

default: A default method or member can be accessed only by the class member that belongs to the same package. For example:

package book;
public class Outerclass
 {
   void test() //default access
     {
       System.out.println(“Outer Class”);
     }
 }

package book1;
import book.*;
class Innerclass
 {
   static public void main(String args[])
     {
       Outerclass oc= new Outerclass();
       oc.test(); // compilation error!
     }
 }

In the above example, there are two packages, book and book1. The package book has a class Outerclass and a method test, which has a default access level. The package book1 has a class Innerclass in which it declares an object of Outerclass. However, when it uses the test() method of the Outerclass, which has a default access level, it will generate a compile-time error No method matching test() found in class.

protected: If the protected modifier is used to define a member, any subclass of the class and its member can access the member through inheritance even if the subclass is in a different package. For example:

package book;
public class read
 {
   protected int r1=10;
 }

package book1;
import book.read;

class Doread extends read
 {
   public void test()
     {
       System.out.println(“The value of r1 is:” +r1);
     }
   }

In the above example, there are two packages, book and book1. The package book has a class read and a protected variable r1. The package book1 has a class Doread, which extends the class read. The compiler will easily access the variable r1 because it inherits the class read.
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The default and protected access modifiers are identical modifiers with only one difference.

default: A default method or member can be accessed only by the class member that belongs to the same package. For example:

package book;
public class Outerclass
 {
   void test() //default access
     {
       System.out.println(“Outer Class”);
     }
 }

package book1;
import book.*;
class Innerclass
 {
   static public void main(String args[])
     {
       Outerclass oc= new Outerclass();
       oc.test(); // compilation error!
     }
 }

In the above example, there are two packages, book and book1. The package book has a class Outerclass and a method test, which has a default access level. The package book1 has a class Innerclass in which it declares an object of Outerclass. However, when it uses the test() method of the Outerclass, which has a default access level, it will generate a compile-time error No method matching test() found in class.

protected: If the protected modifier is used to define a member, any subclass of the class and its member can access the member through inheritance even if the subclass is in a different package. For example:

package book;
public class read
 {
   protected int r1=10;
 }

package book1;
import book.read;

class Doread extends read
 {
   public void test()
     {
       System.out.println(“The value of r1 is:” +r1);
     }
   }

In the above example, there are two packages, book and book1. The package book has a class read and a protected variable r1. The package book1 has a class Doread, which extends the class read. The compiler will easily access the variable r1 because it inherits the class read.
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The HAVING clause sets conditions for the GROUP BY clause in a SELECT statement. It restricts the groups of rows on the basis of aggregate information. Only groups of rows that satisfy the conditions specified in the HAVING clause are displayed.

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extends Super_interfaces: An interface can extend other interfaces in the same way as a class extends another class. The only difference between these two is that whereas a class is allowed to extend only one class, an interface can extend any number of interfaces. The extends keyword in an interface declaration tells the compiler that the interface extends the list of interfaces that follows the extends keyword.

The interface body

The interface body contains method declarations for all the methods included in the interface. A method declared within an interface does not have a body, i.e., the method declaration ends with a semicolon. This is because an interface does not provide implementations for the methods declared within it. Apart from method declarations, an interface contains constant declarations.

All the constants defined in an interface are by default static and final. Therefore, there is no need to explicitly use these keywords to declare variables inside the interface body. All methods and variables in an interface are implicitly public if the interface is declared as public. It is also not necessary to declare the methods as abstract as well. The following example demonstrates how to define an interface:

public interface MyInterface{
void method1();
int method2(int k);
int x = 1;
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