控制反转思想的理解实例

通过依赖注入来从不同的部门获取数据，借助其来理解Spring的IOC

package com.xl.ioc.demo;

public interface DataManagement {
	
	//使用该方法来获取数据
	public void getData();
}

package com.xl.ioc.demo;

public class DepartmentAData implements DataManagement {

	@Override
	public void getData() {
		//使用该方法来从部门A获取数据
		System.out.println("======从部门A获取数据========");

	}

}

 

package com.xl.ioc.demo;

public class DepartmentBData implements DataManagement {

	@Override
	public void getData() {
		//使用该方法来从部门B获取数据
		System.out.println("======从部门B获取数据========");
	}
}

 

package com.xl.ioc.demo;

public class DepartmentCData implements DataManagement {

	@Override
	public void getData() {
		//使用该方法来从部门C获取数据
		System.out.println("======从部门C获取数据========");
	}
}

 

package com.xl.ioc.demo;

public class Business {

	private DataManagement dm;

	public void setDm(DataManagement dm) {
		this.dm = dm;
	}
	//根据注入的获取数据
	public void getData() {	
		dm.getData();
	}
}

 

package com.xl.ioc.demo;

public class Test {

	public static void main(String[] args) {
		
		Business business = new Business();
//		business.setDm(new DepartmentAData());
//		business.setDm(new DepartmentBData());
		business.setDm(new DepartmentCData());
		business.getData();
	}

}