设计模式----访问者模式（visitor pattern）

IVisitor.java代码如下：

package com.designPattern.visitor;

public interface IVisitor {

	public void visit(CommonEmployee commonEmployee);
	
	public void visit(Manager manager);
}

Visitor.java代码如下：

 package com.designPattern.visitor;

public class Visitor implements IVisitor{

	@Override
	public void visit(CommonEmployee commonEmployee) {
		System.out.println(this.getCommonEmployee(commonEmployee));
	}

	@Override
	public void visit(Manager manager) {
		System.out.println(this.getManagerInfo(manager));
	}
	
	private String getBasicInfo(Employee employee){
		String info = "姓名："+employee.getName()+"\t"+"性别："+(employee.getSex()==Employee.FEMALE?"女":"男")+"\t"+"薪水："+employee.getSalary()+"\t";
		
		return info;
	}
	
	private String getManagerInfo(Manager manager){
		String basicInfo = this.getBasicInfo(manager);
		String otherInfo = "业绩："+manager.getPerformance()+"\t";
		return basicInfo+otherInfo;
	}
	
	private String getCommonEmployee(CommonEmployee commonEmployee){
		String basicInfo = this.getBasicInfo(commonEmployee);
		String otherInfo = "工作："+commonEmployee.getJob()+"\t";
		return basicInfo+otherInfo;
	}

}

Employee.java代码如下：

package com.designPattern.visitor;

public abstract class Employee {

	public final static int MALE = 0;
	
	public final static int FEMALE = 1;
	
	private String name;
	
	private int salary;
	
	private int sex ;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getSalary() {
		return salary;
	}

	public void setSalary(int salary) {
		this.salary = salary;
	}

	public int getSex() {
		return sex;
	}

	public void setSex(int sex) {
		this.sex = sex;
	}
	
	public abstract void accept(IVisitor visitor);
	
}

Manager.java代码如下：

 package com.designPattern.visitor;

public class Manager extends Employee{

	private String performance ;
	
	public String getPerformance() {
		return performance;
	}

	public void setPerformance(String performance) {
		this.performance = performance;
	}

	public void accept(IVisitor visitor) {
 		visitor.visit(this);
	}

}

CommonEmployee.java代码如下：

 package com.designPattern.visitor;

public class CommonEmployee extends Employee{

	private String job;
	
	public String getJob() {
		return job;
	}

	public void setJob(String job) {
		this.job = job;
	}

	public void accept(IVisitor visitor) {
		visitor.visit(this);
	}

}

Client.java代码如下：

 package com.designPattern.visitor;

import java.util.ArrayList;
import java.util.List;

public class Client {

	public static void main(String[] args) {
		for(Employee employee:mockEmployee()){
			employee.accept(new Visitor());
		}
	}
	
	public static List<Employee> mockEmployee(){
		List<Employee> employeeList = new ArrayList<Employee>();
		
		CommonEmployee zhangsan = new CommonEmployee();
		zhangsan.setJob("java开发工程师");
		zhangsan.setName("张三");
		zhangsan.setSalary(1900);
		zhangsan.setSex(Employee.MALE);
		employeeList.add(zhangsan);
		
		
		CommonEmployee liSi = new CommonEmployee();
		liSi.setJob("美工");
		liSi.setName("李四");
		liSi.setSalary(4000);
		liSi.setSex(Employee.FEMALE);
		employeeList.add(liSi);
		
		Manager wangwu = new Manager();
		wangwu.setName("王五");
		wangwu.setPerformance("业绩很好");
		wangwu.setSalary(20000);
		wangwu.setSex(Employee.MALE);
		employeeList.add(wangwu);
		
		return employeeList;
	}
}

运行结果如下：

姓名：张三	性别：男	薪水：1900	工作：java开发工程师	
姓名：李四	性别：女	薪水：4000	工作：美工	
姓名：王五	性别：男	薪水：20000	业绩：业绩很好