Hello everyone!
I’m Xiao Huang, I’m glad to meet you again!
The update today is:
- JAVA programming exercises after class-I am a singer
- Past retrieval: program design study notes-catalog
Creation time : October 23, 2020
Software version : eclipse 2020-06 (4.16.0)
1. Title:
1. Requirements for this experiment: Experience the definition and use of abstract classes with different singers singing different songs as the background.
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1-1. Business description :
1-1.1. Singer is a collective term for those who have the ability to sing.
1-1.2. Specific singers have different styles and types, such as popular and ethnic ones;
1-1.3. This experiment will simulate different singers singing different songs as the background to experience the definition and use of abstract types.
1-2. Create a project and configure the environment:
1-2.1. Restrictions 1. Create an experimental project, named: SE_JAVA_EXP_E035P;
1-2.2. Restrictions 2. Create a package, named: cn.campsg.java.experiment;
1-2.3 . Restriction 3. Create a package and name it: cn.campsg.java.experiment.entity.
1-3. Create an abstract class for singers:
1-3.1. Restrictions 1. Create an abstract class in the cn.campsg.java.experiment.entity package: AbstractSinger.
1-3.2. Add "Introduction to Occupation" method to the AbstractSinger class:
1) The display content is: "Hello, I am a singer.";
2) The requirements for the definition of "Introduction to Occupation" method are as follows:
1-3.3. Add to the AbstractSinger class The abstract method of "singing", the method definition requirements are as follows:
1-4. Create pop singer class
1-4.1. Restrictions 1. Create pop singer class in cn.campsg.java.experiment.entity package: PopSinger
1-4.2. Use The PopSinger class inherits the AbstractSinger abstract class.
1-4.3. Implement the sing abstract method defined in the AbstractSinger class in the PopSinger class. The implementation requirements are as follows:
1) Output "I am singing pop music." in the method body to the console.
1-5. Simulate a singer singing:
1 -5.1. Restrictions 1. Create a main class in the cn.campsg.java.experiment package: MainClass;
1-5.2. Create an entry main method for MainClass: main;
1-5.3. In main, instantiate one with the pop singer class Singer object.
1-5.4. In main, call the introduce method and sing method of the singer object.
1-5.5. View and verify the output result in the console. -
2. Realization ideas:
2-1. Create a project and configure the environment.
2-2. Create a singer abstract class:
2-2.1. Restrictions 1. Create an abstract class in the cn.campsg.java.experiment.entity package: AbstractSinger;
2-2.2. Add an "introduction to occupation" method to the AbstractSinger class introduce:
1) This method is an implemented method of the abstract class for direct use by subclasses;
2) The logic of this method is implemented as the display content: "Hello, I am a singer.";
3) This method is defined as follows:
2-2.3. For AbstractSinger The abstract method sing to add "singing" to the class:
1) This method is implemented by a concrete subclass, and only the method form is defined in the abstract class:
2-3. Create pop singer class
2-3.1. Restrictions 1. In cn.campsg.java. Create a pop singer class in the experiment.entity package: PopSinger 2-3.2
. Add a parameterless constructor to the PopSinger class.
2-3.3. Make the PopSinger class inherit the AbstractSinger abstract class.
2-3.4. Implement the sing abstract method defined in the parent class in the PopSinger class. The implementation requirements are as follows:
1) Output "I sing pop music." in the method body to the console.
2-4. Simulate singer singing
2- 4.1. Restrictions 1. Create a main class in the cn.campsg.java.experiment package: MainClass;
2-4.2. Create an entry main method for MainClass: main;
2-4.3. In main, instantiate a singer object with the pop singer class.
2-4.4. In main, call the introduce method and sing method of the singer object.
2-4.5. View and verify the output result in the console.
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3. Verification and testing:
3-1. Locate the main class MainClass in the project.
3-2. Right-click the MainClass class and select in turn: Run As->Java Application.
3-3. Run the program to check whether the output result meets expectations. -
4. Complete effect preview:
2. Code:
- eclipse project directory:
- 包名 ：cn.campsg.java.experiment
- Class name: MainClass
package cn.campsg.java.experiment;
import cn.campsg.java.experiment.entity.AbstractSinger;
import cn.campsg.java.experiment.entity.PopSinger;
public class MainClass {
public static void main(String[] args) {
AbstractSinger s = new PopSinger();
s.introduce();
s.sing();
}
}
- 包名 ：cn.campsg.java.experiment.entity
- Class name: AbstractSinger
package cn.campsg.java.experiment.entity;
public abstract class AbstractSinger {
public void introduce() {
System.out.println("Hello，我是歌手。");
}
public abstract void sing() ;
}
- 包名 ：cn.campsg.java.experiment.entity
- Class name: PopSinger
package cn.campsg.java.experiment.entity;
public class PopSinger extends AbstractSinger{
public void sing() {
System.out.println("我是唱流行乐的。");
}
}
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