可以像这样调用该方法。还有更多的可能性(检查反射api)，但这是最简单的一个:

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.junit.Assert;
import org.junit.Test;

public class ReflectionTest {

    private String methodName = "length";
    private String valueObject = "Some object";

    @Test
    public void testGetMethod() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
            IllegalAccessException, InvocationTargetException {
        Method m = valueObject.getClass().getMethod(methodName, new Class[] {});
        Object ret = m.invoke(valueObject, new Object[] {});
        Assert.assertEquals(11, ret);
    }



}

首先,不要。避免使用这类代码。它往往是非常糟糕的代码，也不安全(请参阅安全编码指南的第6节) Java编程语言，版本2.0)。

如果你必须这样做，你更喜欢java。豆子要反射。Beans包装反射，允许相对安全和常规的访问。

请参考以下代码，可能对您有帮助。

public static Method method[];
public static MethodClass obj;
public static String testMethod="A";

public static void main(String args[]) 
{
    obj=new MethodClass();
    method=obj.getClass().getMethods();
    try
    {
        for(int i=0;i<method.length;i++)
        {
            String name=method[i].getName();
            if(name==testMethod)
            {   
                method[i].invoke(name,"Test Parameters of A");
            }
        }
    }
    catch(Exception ex)
    {
        System.out.println(ex.getMessage());
    }
}

谢谢……

为了完成我同事的回答，你可能需要密切关注以下问题:

static or instance calls (in one case, you do not need an instance of the class, in the other, you might need to rely on an existing default constructor that may or may not be there) public or non-public method call (for the latter,you need to call setAccessible on the method within an doPrivileged block, other findbugs won't be happy) encapsulating into one more manageable applicative exception if you want to throw back the numerous java system exceptions (hence the CCException in the code below)

下面是一个旧的java1.4代码，它考虑了这些要点:

/**
 * Allow for instance call, avoiding certain class circular dependencies. <br />
 * Calls even private method if java Security allows it.
 * @param aninstance instance on which method is invoked (if null, static call)
 * @param classname name of the class containing the method 
 * (can be null - ignored, actually - if instance if provided, must be provided if static call)
 * @param amethodname name of the method to invoke
 * @param parameterTypes array of Classes
 * @param parameters array of Object
 * @return resulting Object
 * @throws CCException if any problem
 */
public static Object reflectionCall(final Object aninstance, final String classname, final String amethodname, final Class[] parameterTypes, final Object[] parameters) throws CCException
{
    Object res;// = null;
    try {
        Class aclass;// = null;
        if(aninstance == null)
        {
            aclass = Class.forName(classname);
        }
        else
        {
            aclass = aninstance.getClass();
        }
        //Class[] parameterTypes = new Class[]{String[].class};
    final Method amethod = aclass.getDeclaredMethod(amethodname, parameterTypes);
        AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
                amethod.setAccessible(true);
                return null; // nothing to return
            }
        });
        res = amethod.invoke(aninstance, parameters);
    } catch (final ClassNotFoundException e) {
        throw new CCException.Error(PROBLEM_TO_ACCESS+classname+CLASS, e);
    } catch (final SecurityException e) {
        throw new CCException.Error(PROBLEM_TO_ACCESS+classname+GenericConstants.HASH_DIESE+ amethodname + METHOD_SECURITY_ISSUE, e);
    } catch (final NoSuchMethodException e) {
        throw new CCException.Error(PROBLEM_TO_ACCESS+classname+GenericConstants.HASH_DIESE+ amethodname + METHOD_NOT_FOUND, e);
    } catch (final IllegalArgumentException e) {
        throw new CCException.Error(PROBLEM_TO_ACCESS+classname+GenericConstants.HASH_DIESE+ amethodname + METHOD_ILLEGAL_ARGUMENTS+String.valueOf(parameters)+GenericConstants.CLOSING_ROUND_BRACKET, e);
    } catch (final IllegalAccessException e) {
        throw new CCException.Error(PROBLEM_TO_ACCESS+classname+GenericConstants.HASH_DIESE+ amethodname + METHOD_ACCESS_RESTRICTION, e);
    } catch (final InvocationTargetException e) {
    throw new CCException.Error(PROBLEM_TO_ACCESS+classname+GenericConstants.HASH_DIESE+ amethodname + METHOD_INVOCATION_ISSUE, e);
    } 
    return res;
}

您应该使用reflection - init一个类对象，然后是该类中的一个方法，然后在具有可选参数的对象上调用此方法。记住将下面的代码段封装在try-catch块中

希望能有所帮助!

Class<?> aClass = Class.forName(FULLY_QUALIFIED_CLASS_NAME);
Method method = aClass.getMethod(methodName, YOUR_PARAM_1.class, YOUR_PARAM_2.class);
method.invoke(OBJECT_TO_RUN_METHOD_ON, YOUR_PARAM_1, YOUR_PARAM_2);

使用import java.lang.reflect.*;

public static Object launchProcess(String className, String methodName, Class<?>[] argsTypes, Object[] methodArgs)
        throws Exception {

    Class<?> processClass = Class.forName(className); // convert string classname to class
    Object process = processClass.newInstance(); // invoke empty constructor

    Method aMethod = process.getClass().getMethod(methodName,argsTypes);
    Object res = aMethod.invoke(process, methodArgs); // pass arg
    return(res);
}

下面是你如何使用它:

String className = "com.example.helloworld";
String methodName = "print";
Class<?>[] argsTypes = {String.class,  String.class};
Object[] methArgs = { "hello", "world" };   
launchProcess(className, methodName, argsTypes, methArgs);