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Methods

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java.lang.reflect.Method 类提供了访问方法的修饰符,返回类型,方法参数,注解,和可能抛也的异常的API.也可以调用方法.:

获取方法类型信息:
如何来列举申明在类中的方法,以及如何获取其类型信息.
一个方法的申明包括方法名,修饰符,参数,返回类型,以及可能抛也的异常.我们可能通过java.lang.reflect.Method来获取.如下示例:
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import static java.lang.System.out;

public class MethodSpy {
		private static final String fmt = "%24s: %s%n";
		<E extends RuntimeException> void genericThrow() throws E {}
		private int get(int x,int y,double z) {
				return 0;	
		}
		
		public static void main(String... args) {
			try {
				Class<?> c = Class.forName(args[0]);
				Method[] allMethods = c.getDeclaredMethods();
				for(Method m : allMethods) {
						if(!m.getName().equals(args[1])) {
								continue;	
						}	
						out.format("%s%n",m.toGenericString());
						
						out.format(fmt, "ReturnType",m.getReturnType());
						out.format(fmt, "GenericReturnType",m.getGenericReturnType());
						
						Class<?> [] pType = m.getParameterTypes();
						Type[] gpType = m.getGenericParameterTypes();
						for(int i = 0; i < pType.length;i++) {
								out.format(fmt,"ParameterType",pType[i]);
								out.format(fmt,"genericParameterType",gpType[i]);	
						}
						
						Class<?>[] xType = m.getExceptionTypes();
						Type[] gxType = m.getGenericExceptionTypes();
						for(int i = 0;i < xType.length;i++) {
								out.format(fmt,"ExceptionType",xType[i]);
								out.format(fmt,"GenericExceptionType",gxType[i]);	
						}
				}	//for
			}	catch(ClassNotFoundException x) {
					x.printStackTrace();	
			}
		}	//main
}//class
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