Java Reflection Method Invoke invokeMethodAndReturn(Class clazz, String method, Object object)

Description

invoke Method And Return

License

Open Source License

Declaration

public static Object invokeMethodAndReturn(Class<?> clazz, String method, Object object) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

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

public class Main {
    public static Object invokeMethodAndReturn(Method method, Object instance) {
        Object ret;/*www .j a v  a  2s. c  o m*/

        try {
            method.setAccessible(true);
            ret = method.invoke(instance);
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            ret = null;
        }

        return ret;
    }

    public static Object invokeMethodAndReturn(Method method, Object instance, Object[] params) {
        Object ret;

        try {
            method.setAccessible(true);
            ret = method.invoke(instance, params);
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            ret = null;
        }

        return ret;
    }

    public static Object invokeMethodAndReturn(Class<?> clazz, String method, Object object) {
        Object value = null;

        try {
            Method methodToInvoke = getMethod(clazz, method);
            methodToInvoke.setAccessible(true);

            value = methodToInvoke.invoke(object);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        return value;
    }

    public static Object invokeMethodAndReturn(Class<?> clazz, String method, Object object, Object... params) {
        Object value = null;

        Class<?>[] args = new Class<?>[params.length];
        for (int x = 0; x < params.length; x++) {
            args[x] = params[x].getClass();
        }

        try {
            Method methodToInvoke = getMethod(clazz, method, args);
            methodToInvoke.setAccessible(true);

            value = methodToInvoke.invoke(object, params);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        return value;
    }

    public static Method getMethod(Class<?> clazz, String method, Class<?>[] args) {
        for (Method m : clazz.getMethods()) {
            if (m.getName().equals(method) && classListEqual(args, m.getParameterTypes())) {
                return m;
            }
        }

        return null;
    }

    public static Method getMethod(Class<?> clazz, String method, Integer args) {
        for (Method m : clazz.getMethods()) {
            if (m.getName().equals(method) && args.equals(Integer.valueOf(m.getParameterTypes().length))) {
                return m;
            }
        }

        return null;
    }

    public static Method getMethod(Class<?> clazz, String method) {
        for (Method m : clazz.getMethods()) {
            if (m.getName().equals(method)) {
                return m;
            }
        }

        return null;
    }

    public static boolean classListEqual(Class<?>[] listOne, Class<?>[] listTwo) {
        if (listOne.length != listTwo.length) {
            return false;
        }

        for (int i = 0; i < listOne.length; i++) {
            if (listOne[i] != listTwo[i] && (listTwo[i].isAssignableFrom(listOne[i]) == false)) {
                return false;
            }
        }

        return true;
    }
}

Related

1. invokeMethod(String methodName, Object gameCommand)
2. invokeMethod(String name, Object target)
3. invokeMethod2(Class cls, Object obj, String methodName, Object[] args)
4. invokeMethodAndGet(Object object, String methodName, Object... args)
5. invokeMethodAndGetRecursively(Object object, String methodName, Object... args)
6. invokeMethodByName(@Nonnull T object, @Nonnull String name, Class typeArg, Object arg)
7. invokeMethodByName(final Object obj, final String methodName, final Object[] args)
8. invokeMethodHandleException(Method method, Object... args)
9. invokeMethodNoArgs(final Object obj, final String methodName, final Class... returnTypePreference)