C02_D12_bean_inheritance

//bean
public class Address {

    private String province; //省
    private String city;     //市
    private String detailedAddress; //详细地址

    @Override
    public String toString() {
        return "地址::" + province + "省" + city + "市" + detailedAddress;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public void setDetailedAddress(String detailedAddress) {
        this.detailedAddress = detailedAddress;
    }
}
public class Employee {

    private String empId; // 员工编号
    private String empName; // 员工姓名
    private double empSalary; // 员工工资
    private Address address; // 员工地址

    public void init() {
        System.out.println("init....");
    }

    public void destroy() {
        System.out.println("destroy....");
    }

    public void showEmployeeDetails() {
        System.out.println("---------------员工信息---------------");
        // 输出员工基本信息
        System.out.println("工号：" + empId);
        System.out.println("姓名：" + empName);
        System.out.println("工资：" + empSalary);
        // 输出员工地址信息
        System.out.println(address);
    }

    public void setEmpId(String empId) {
        this.empId = empId;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }

    public void setEmpSalary(double empSalary) {
        this.empSalary = empSalary;
    }

    public void setAddress(Address address) {
        this.address = address;
    }
}

//config-beans.xml
    <bean id="addr1" class="com.qdu.bean.Address">
        <property name="province" value="山东" />
        <property name="city" value="青岛" />
        <property name="detailedAddress" value="宁夏路308号 青岛大学" />
    </bean>

    <bean id="addr2" class="com.qdu.bean.Address">
        <property name="province" value="山东" />
        <property name="city" value="临沂" />
        <property name="detailedAddress" value="人民广场" />
    </bean>

    <bean id="emp1" class="com.qdu.bean.Employee" init-method="init"
        destroy-method="destroy">
        <property name="empId" value="E001" />
        <property name="empName" value="小明" />
        <property name="empSalary" value="20000.3" />
        <property name="address" ref="addr1" />
    </bean>

    <!-- 可以使用bean标记的parent属性指定当前bean继承自哪个bean -->
    <!-- 给出其id或name即可 -->
    <!-- bean的继承类似类的继承，但不是类的继承 -->
    <!-- 而是继承那个bean的配置，包括依赖注入和特定于容器的配置（范围、init-method等） -->
    <!-- 方便重用代码 -->
    <!-- 如果在当前bean定义了相同的依赖注入或配置，则覆盖继承的配置 -->
    <bean id="emp2" class="com.qdu.bean.Employee" parent="emp1">
        <property name="address" ref="addr2" />
    </bean>

//main
public static void main(String[] args) {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("config/beans.xml");

        Employee emp1 = (Employee) ctx.getBean("emp1");
        emp1.showEmployeeDetails();

        Employee emp2 = (Employee) ctx.getBean("emp2");
        emp2.showEmployeeDetails();

        ((ClassPathXmlApplicationContext)ctx).registerShutdownHook();
    }