Java abstract class

Classes declared with the abstract keyword become "abstract classes". An abstract method is an incomplete method in which only one declaration has no body part of the method.

1  Public Abstract classAbstracttest {2     3     //Abstract Methods4      Public Abstract voidtest1 ();5     6     //Non-abstract methods7      Public voidtest2 () {8SYSTEM.OUT.PRINTLN ("Non-abstract method in abstract class");9     }Ten  One}

The above code explains that abstract classes are incomplete classes, and the methods are not fully implemented.

And look at the code below.

1  Public classAbstractextendsextendsAbstracttest {2 3 @Override4      Public voidtest1 () {5         //TODO auto-generated Method Stub6 7     }8 9      Public Static voidMain (string[] args) {TenAbstracttest abstracttest =Newabstracttest () { One  A @Override -              Public voidtest1 () { -                 //TODO auto-generated Method Stub the  -             } -         }; -     } +}

Attention:

1. Abstract classes cannot be instantiated directly,

2. When inheriting an abstract class, you need to override each abstract method in the class.

Java abstract class