java annotation 注解 异常处理

package com.le;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@interface Test {

}

class Sample{
	@Test
	public static void m1(){}
	public static void m2(){}
	@Test
	public static void m3(){
		throw new RuntimeException("Boom");
	}
	public static void m4(){}
	@Test
	public void m5(){}
	public static void m6(){}
	@Test
	public static void m7(){
		throw new RuntimeException("Crash");
	}
	public static void m8(){};
}


@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@interface ExceptionTest{
	Class value();
}

class Sample2{
	@ExceptionTest(ArithmeticException.class)
	public static void m1(){
		int i=0;
		i=i/i;
	}
	@ExceptionTest(ArithmeticException.class)
	public static void m2(){
		int[] a=new int[0];
		int i=a[1];
	}
	@ExceptionTest(ArithmeticException.class)
	public static void m3(){}
}


public class RunTests {
	public void main1() throws Exception {
		int tests=0;
		int passed=0;
		Class testClass=Class.forName("com.le.Sample");
		for(Method m:testClass.getDeclaredMethods()){
			if(m.isAnnotationPresent(Test.class)){
				tests++;
				try {
					m.invoke(null);
					passed++;
				} catch (InvocationTargetException ite) {
					Throwable exc=ite.getCause();
					System.out.println(m+" failed : "+exc);
				} catch(Exception e){
					System.out.println("INVALID @Test:"+m);
				}
			}
		}
		System.out.printf("Passed: %d, Failed: %d%n",passed,tests-passed);
	}
	public static void main(String[] args) throws Exception {
		int tests=0;
		int passed=0;
		Class testClass=Class.forName("com.le.Sample2");
		for(Method m:testClass.getDeclaredMethods()){
			if(m.isAnnotationPresent(ExceptionTest.class)){
				tests++;
				try {
					m.invoke(null);
					System.out.printf("Test %s failed : no exception%",m);
				} catch (InvocationTargetException ite) {
					Throwable exc=ite.getCause();
					Class excType=m.getAnnotation(ExceptionTest.class).value();
					if(excType.isInstance(exc)){
						passed++;
					}else{
						System.out.printf("Test %s failed: expected %s,got %s%n",m,excType.getName(),exc);
					}
				} catch(Exception e){
					System.out.println("INVALID @ExceptionTest:"+m);
				}
			}
		}
		System.out.printf("Passed: %d, Failed: %d%n",passed,tests-passed);
	}
	
	
}