原创文章，转载请标明出处
http://space.itpub.net/26239116/viewspace-749136
创建注解
这里创建了OS和softWare两个注解，OS里有type,name和softWare的列表，
softWare里有软件的name和type
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface OS {
public enum osType {linux, unix, aix};
public osType type() default osType.linux;
public String name();
public Software[] softwares();
}
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Software {
public enum sofwareType {SYSTEM, USER}
public String name();
public sofwareType type();
}
给函数添加注解
注解中应当以的
enum 类型变量相当于类中的public static 变量，可以直接引用
public class Computers {
@OS(type = osType.linux, name = "red hat", softwares = {
@Software(name = "rpm", type = sofwareType.SYSTEM),
@Software(name = "oracle", type = sofwareType.USER) })
public void computer1(){}
@OS(type = osType.linux, name = "ubuntu", softwares = {
@Software(name = "wget", type = sofwareType.USER),
@Software(name = "firefox", type = sofwareType.USER) })
public void computer2(){}
@OS(type = osType.unix, name = "freeBSD", softwares = {
@Software(name = "ping", type = sofwareType.SYSTEM) })
public void computer3(){}
}
在第三方获取注解
public class Main {
public static void main(String[] args)
{
int softwareLen;
for(Method method : Computers.class.getDeclaredMethods())
{
OS os = (OS)method.getAnnotation(OS.class);
if(os == null)
{
continue;
}
softwareLen = os.softwares().length;
System.out.println(os.type());
System.out.println(os.name());
if(softwareLen > 0)
{
for(Software software : os.softwares())
{
System.out.println(software.name() + " " + software.type());
}
}
}
}
}
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/26239116/viewspace-749139/ ，如需转载，请注明出处，否则将追究法律责任。
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