Java中利用注解和反射简化编程

一 点睛

当调用大量方法，可以使用反射和注解简化编程。 

二 代码

import java.lang.annotation.Annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Method;
import java.util.ArrayList;

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@interface testAnnoation10 {
    public String name() default "methodname";

    public String unit() default "unit";
}

public class ch11_10 {
    public static void main( String[] args ) throws Exception {
        ch11_10 ch9 = new ch11_10();
        Method method[] = ch9.getClass().getMethods();
        for (Method method2 : method) {
            Annotation annotation = method2.getAnnotation(testAnnoation10.class);
            Class<?> ts[] = method2.getParameterTypes();
            if (method2.getName().indexOf("getData") == -1) continue;
            ArrayList<Object> params = new ArrayList<Object>();
            for (Class<?> class1 : ts) {
                if (class1.getSimpleName().equals("int")) {
                    params.add(10);
                }
                if (class1.getSimpleName().equals("String")) {
                    params.add("100");
                }
            }
            if (annotation != null) {
                testAnnoation10 t9 = (testAnnoation10) annotation;
                System.out.println(t9.name() + " is " + method2.invoke(ch9, params.toArray()) + " " + t9.unit());
            }
        }
    }

    @testAnnoation10(name = "SOC", unit = "%")
    public int getData1( int a ) {
        return a;
    }

    @testAnnoation10(name = "Electricity", unit = "Ah")
    public String getData2( String b ) {
        return b;
    }

    @testAnnoation10(name = "Tempreture", unit = "AF")
    public int getData3( int a, int b ) {
        return a + b;
    }
}

三 运行

Tempreture is 20 AF
Electricity is 100 Ah
SOC is 10 %