设计模式-访问者模式
import java.util.ArrayList; import java.util.List; public class 访问者结构 { public static void main(String[] args) { Visit visit1=new VisitA(); Visit visit2=new VisitB(); PersonStructure personStructure=new PersonStructure(); personStructure.Accept(visit1); personStructure.Accept(visit2); } } interface Visit{ public void visitStudent(Students student); public void visitTeacher(Teachers teacher); } class VisitA implements Visit{ @Override public void visitStudent(Students student) { System.out.println("访问者1访问学生:"+student.name); } @Override public void visitTeacher(Teachers teacher) { System.out.println("访问者1访问老师:"+teacher.name); } } class VisitB implements Visit{ @Override public void visitStudent(Students student) { System.out.println("访问者2访问学生:"+student.name); } @Override public void visitTeacher(Teachers teacher) { System.out.println("访问者2访问老师:"+teacher.name); } } class PersonStructure{ private List<Persons> list=new ArrayList<>(); public PersonStructure() { list.add(new Students("张三")); list.add(new Students("李四")); list.add(new Students("王五")); list.add(new Teachers("李老师")); list.add(new Teachers("王老师")); } public void Accept(Visit visit) { for(Persons person:list) { person.Accept(visit); } } } abstract class Persons{ public String name; public abstract void Accept(Visit visit); } class Students extends Persons{ public Students(String name) { this.name=name; } @Override public void Accept(Visit visit) { visit.visitStudent(this); } } class Teachers extends Persons{ public Teachers(String name) { this.name=name; } @Override public void Accept(Visit visit) { visit.visitTeacher(this); } }
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