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1.
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Class is a user defined data type which is used to define properties of data.
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Interface is a type of class which is used for only declaration of methods and fields.
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2.
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Class can have zero, one or more abstract methods or can have final fields.
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Interface have all abstract methods and final fields.
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3.
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All the program is written inside the class because of object oriented concept.
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Interfaces are used for data hiding (abstraction).
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4.
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Class can extend to only one other class.
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Interface can extend to multiple other interfaces but not with any class.
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5.
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Multiple classes can be combined together to form a single class.
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Multiple interfaces can be combined together to form a single interface.
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6.
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Classes are allowed to extend with other classes, and subclasses inherit some or all the methods declared in the super classes are still classes.
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Interfaces are allowed to extend with other interfaces, but subinterfaces cannot define the methods declared in the superinterfaces. superinterfaces are still interfaces not classes.
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7.
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A class can extend interfaces
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Interface cannot extend classes
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8.
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Classes cannot be implemented
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Interface must be implemented to other classes for writting their definition.
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9.
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Syntax
class ClassName
{
type Methodname()
{
//body of method
}
type fieldName ;
}
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Syntax
interface InterfaceName
{
type methodName1();
type methodName2();
.
.
type field1 = value;
type field2 = value;
}
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10.
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Classes doesn't allow to declare methods. It possible by using abstract keyword.
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Interface allows us to declare methods. Their body must be written into subclass.
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