Inheritance is one of the important concept of object oriented programming. The simple definition says inheritance provides mechanism that allows a class to inherit properties of another class.<\/p>\n
Inheritance Concept<\/u><\/strong>:<\/strong><\/span> Inheritance means inherit the properties and behavior of existing object in a new object.<\/p>\n Way To Achieve Inheritance<\/u><\/strong>: <\/strong><\/span>It is achieved by deriving a new class from existing class using extends keyword. Example, For example :<\/p>\n Suppose a class name Base.java<\/p>\n Another class Child.java use Inheritance to extends properties from Base class.<\/p>\n In the above example, Child class will inherit\u00a0field and methods of Base class.<\/p>\n There are 3 types of inheritance:<\/p>\n 1. Single Inheritance:<\/strong><\/span><\/p>\n In Single inheritance one class is derived from one parent class. The below diagram shows single inheritance where Class B inherits from Class A.<\/p>\n In multilevel inheritance there is a concept of grand parent class as shown in below diagram class C inherits class B and class B inherits class A.<\/p>\n In Hierarchical inheritance more than one sub classes is derived from a single parent class as shown in below diagram class B and C both are derived from single parent class A.<\/p>\n Why multiple inheritance is not supported in java:<\/strong><\/span><\/p>\n To remove ambiguity<\/strong>:<\/p>\n Multiple inheritance is not supported in java as it causes ambiguity in few scenarios. The most common scenario is Diamond problem.<\/strong><\/p>\n Below is the program to show you the use of inheritance in java. For coding this we have used eclipse IDE.<\/p>\n Example 1:<\/strong><\/span> Let’s inherit some fields and methods in Child class from Base class.<\/p>\n Base class is having 2 fields and 1 method:<\/p>\n Child class inherit addition method and x field from Base class:<\/p>\n In the Main class we create Child object and calls subtraction method on it.<\/p>\n Output:<\/strong><\/p>\n Example 2:<\/strong><\/span><\/p>\n Base.java:<\/strong><\/p>\n Child.java:<\/strong><\/p>\n InheritanceAbhiandroid.java<\/strong><\/p>\n OUTPUT:<\/strong><\/p>\n Important Note:<\/strong><\/span> The above program prints value of x=20 because priority always goes to local variables. So in show() method of child class,we can access member of parent class i.e base class using super <\/strong>keyword. It means if we want to print value of x=50 also from the same above program then by using super keyword.<\/p>\n Example 3 of Inheritance using super keyword:<\/strong><\/span><\/p>\n Base.java:<\/strong><\/p>\n Child.java:<\/strong><\/p>\n OUTPUT:<\/strong><\/p>\n Inheritance is a mechanism that allows the class to use the states and behavior of another class. In simple words a class derive field and methods from another class. The derived class in inheritance is called sub class (also called derived class or extended class, or child class) and the class from which it is … Continue reading Inheritance Tutorial With Example In JAVA<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"home.php","meta":{"footnotes":""},"class_list":["post-479","page","type-page","status-publish","hentry"],"psp_head":"Class Child extends Base { }<\/code>.<\/p>\n
\nExplanation With Example:<\/strong><\/h4>\n
\n
class Base\r\n{\r\n\/\/Code of Base class\r\n}<\/pre>\nClass Child extends Base\r\n\r\n{\r\n\/\/extends the properties of base class\r\n}<\/pre>\n
\nTypes Of Inheritance<\/strong><\/h4>\n
\n
![\"Single](\"\/java\/wp-content\/uploads\/2016\/01\/Single-Inheritance-in-JAVA.jpg\")
<\/center>2. Multilevel Inheritance:<\/span><\/strong><\/p>\n![\"Multilevel](\"\/java\/wp-content\/uploads\/2016\/01\/Multilevel-Inheritance-in-JAVA.jpg\")
<\/center>3. Hierarchical Inheritance:<\/strong><\/span><\/p>\n![\"Hierarchical](\"\/java\/wp-content\/uploads\/2016\/01\/Hierarchical-Inheritance-in-JAVA.jpg\")
<\/center>Important Note: <\/strong><\/span>Java does not support multiple Inheritance .<\/p>\n![\"ambiguity](\"\/java\/wp-content\/uploads\/2016\/01\/ambiguity-problem-in-JAVA.jpg\")
<\/center>Consider the above diagram which shows multiple inheritance. In this class D extends both class B & C.Here class B & C inherit the same method of class A. Now the problem comes when class D is extending both class B & C and if class D wants to use same method then which method would be called? That’s why multiple inheritance is not supported in java as to remove ambiguity.<\/p>\n
\nInheritance Example:<\/strong><\/h4>\n
class Base\r\n{\r\n\tint x=50;\r\n\tint y = 60;\r\n\r\n\/\/Addition method return integer value of x+y\r\n\tpublic int addition(){\r\n\t\treturn x+y; \/\/return 110\r\n\r\n\t}\r\n}<\/pre>\npublic class Child extends Base\r\n{\r\n\r\n\tint z;\r\n\tpublic void subtraction(){\r\n\t\t\r\n\t\t\/\/addition method and x filed is inherited from Base Class\r\n\t\tz = addition() - x;\r\n\t\tSystem.out.println(z);\r\n\t}\r\n\r\n}<\/pre>\npublic class InheritanceAbhiandroid {\r\n\r\npublic static void main(String[] args) {\r\n\r\nChild child = new Child(); \/\/Child object\r\nchild.subtraction();\/\/Subtraction method called on child object\r\n\r\n}\r\n\r\n}<\/pre>\n60<\/pre>\n
class Base\r\n{\r\nint x=50;\r\n}<\/pre>\npublic class Child extends Base\r\n{\r\n int x=20;\r\n void show()\r\n {\r\n System.out.println(x);\r\n }\r\n}<\/pre>\npublic class InheritanceAbhiandroid {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tChild c = new Child();\r\n\t\tc.show();\r\n\r\n\t}\r\n\r\n}<\/pre>\n20<\/pre>\n
class Base\r\n{\r\nint x=50;\r\n}<\/pre>\nclass Child extends Base\r\n{\r\nint x=20;\r\nvoid show()\r\n{\r\nSystem.out.println(x);\r\nSystem.out.println(super.x);\r\n}\r\n}<\/pre>\npublic class InheritanceAbhiAndroid{\r\n\r\npublic static void main(String[] args)\r\n{\r\nChild c=new Child();\r\nc.show();\r\n}\r\n}<\/pre>\n20\r\n50<\/pre>\n
\nImportance Of Inheritance:<\/strong><\/h4>\n
\n
\nInheritance Important Points To Remember:<\/strong><\/h4>\n
\n
\nInheritance Quick Revision:<\/strong><\/h4>\n
\n