Pray god to do under the
1, the experiment requirements
This experiment: in different singers sing a different song as the background, experience the definition and use of abstract classes
1 to 1. The business description:
1-1.1. Singer is capable of singing collectively,
1-1.2. Specific singer and with different style and type, such as pop, national class;
1-1.3. This experiment to simulate different singers to sing the song as the background, experience the definition and use of abstract classes
1-2. Create a project and configure the environment:
1-2.1. The limit 1. Create a test project, named: SE_JAVA_EXP_E035P;
1-2.2. Limit 2. Create a package, named: cn. Campsg. Java. Experiment;
1-2.3. Limit 3. Create a package, named: cn. Campsg. Java. Experiment. The entity,
1-3. Create a singer is an abstract class:
1-3.1. Limit 1. In cn. Campsg. Java. The experiment, the entity in the package to create an abstract class: AbstractSinger,
1-3.2. For AbstractSinger method of adding "introduce professional class:
1) display content is: "Hello, I am a singer,";
2) the method definition of "introduction to professional requirements are as follows:
Access to
Method name
The return value
The method parameters
Parameter description
Public
Introduce
Void
There is no
There is no
Method statement
His own used to introduce professional,
AbstractSinger for 1-3.3. Add "sing" abstract methods, methods to define requirements are as follows:
Access to
Method name
The return value
The method parameters
Parameter description
Public
Sing
Void
There is no
There is no
Method statement
Singer singing abstract method,
Class 1-4. Create a pop singer,
1-4.1. Limit 1. In cn. Campsg. Java. The experiment, the entity in the package to create pop singer: PopSinger
1-4.2. Make PopSinger AbstractSinger abstract class, the class hierarchy
1-4.3. PopSinger class implement the AbstractSinger defined in the class sing abstract methods, implementation requirements are as follows:
1) to the console output in the method body "I sing pop music,"
1-5. Simulation singer to sing a song:
1-5.1. Limit 1. In cn. Campsg. Java. The experiment in the package to create the main class: MainClass;
1-5.2. For the entrance to the main ways to create MainClass: the main;
1-5.3. In the main, with the pop star class instantiation object of a singer,
1-5.4. In the main, the call object singer introduce method and sing method,
1-5.5. In the console view and verify the output,
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