简单工厂模式

使用简单工厂模式模拟女娲(Nvwa)造人(Person)，如果传入参数M，则返回一个Man对象，如果传入参数W，则返回一个Woman对象，如果传入参数R，则返回一个Robot对象。
（1）类图

 

 

（2）源代码

 

 

//Man.java
package nvwa;

public class Man implements Person{
    
    public Man() {
        
    }
    public void make(){
        
        System.out.print("生产男人");
        
    }
}
//Nvwa.java
package nvwa;

public class Nvwa {

    public Nvwa() {
    
    }

    public static  Person Personjudge(String arg ) {
        //判断参数，再选择调用哪个类
        if(arg.equalsIgnoreCase("M"))
        {
            return new Man();
        }else if(arg.equalsIgnoreCase("W"))
        {
            return new Woman();
        }else if(arg.equalsIgnoreCase("R"))
        {
            return new Robot();
        }else
        {
            return null;
        }
    }
    }
//Person.java
package nvwa;

public interface Person {
    
    public void make();
    
}
//Robot.java
package nvwa;

public class Robot implements Person{
    
    public Robot() {
    }
    
    public void make(){
        
        System.out.print("生产机器人");
        
    }
}

//test,java
package nvwa;

import java.util.Scanner;

public class test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
          System.out.print("请输入参数:");
          String s = scan.nextLine();
          
        try{
            Person p = Nvwa.Personjudge(s);
            p.make();
        }catch(Exception e){
            System.out.println(e.getMessage());
        }
        scan.close();
    }

}
//Woman.java
package nvwa;

public class Woman implements Person{
    
    public Woman() {
    }
    
    public void make() {
        
        System.out.print("生产女人");
        
    }
}