Java Reflection Method Invoke invokeMethod(Class targetClass, Object obj, String methodName, Object arg)

Description

invoke Method

License

Open Source License

Parameter

Parameter	Description
target	Class Instance
methodName	a parameter
arg	a parameter

Declaration

public static Object invokeMethod(Class targetClass, Object obj, String methodName, Object arg) 

Method Source Code

//package com.java2s;

import java.lang.reflect.Method;

public class Main {
    /**//from w  w  w .j a v  a 2 s.c  o m
     * invoke Method
     * 
     * @param target
     *            Class
     * @param target
     *            Class Instance
     * @param methodName
     * @param arg
     * @return
     */
    public static Object invokeMethod(Class targetClass, Object obj, String methodName, Object arg) {
        Object result = null;
        try {
            Class argClasses[] = null;
            if (arg != null)
                argClasses = new Class[] { arg.getClass() };
            Method method = getMethod(targetClass, methodName, argClasses);
            result = method.invoke(obj, new Object[] { arg });
        } catch (Exception e) {
            // logger.debug(e);
        }
        return result;
    }

    /**
     * invoke Method
     * 
     * @param obj
     * @param methodName
     * @param arg
     * @return Object
     */
    public static Object invokeMethod(Object obj, String methodName, Object arg) {
        Class objClass = obj.getClass();
        Object result = null;
        try {
            Class argClasses[] = null;
            if (arg != null)
                argClasses = new Class[] { arg.getClass() };
            Method method = getMethod(objClass, methodName, argClasses);
            result = method.invoke(obj, new Object[] { arg });
        } catch (Exception e) {
            // logger.debug(e);
        }
        return result;
    }

    /**
     * invoke Method
     * 
     * @param obj
     * @param methodName
     * @param args
     * @return
     */
    public static Object invokeMethod(Object obj, String methodName, Object args[]) {
        Class objClass = obj.getClass();
        Object result = null;
        try {
            Class argClasses[] = null;
            if (args != null && args.length > 0) {
                argClasses = new Class[args.length];
                for (int i = 0, max = args.length; i < max; i++) {
                    argClasses[i] = (args[i] == null) ? null : args[i].getClass();
                }
            }
            Method method = getMethod(objClass, methodName, argClasses);
            result = method.invoke(obj, args);
        } catch (Exception e) {
            // logger.debug(e);
        }
        return result;
    }

    /**
     * get Method
     * 
     * @param objClass
     * @param methodName
     * @param argClass
     * @return Method
     * @throws Exception
     */
    public static Method getMethod(Class objClass, String methodName, Class argClass) throws Exception {
        Class argClasses[] = (argClass == null) ? null : new Class[] { argClass };
        return getMethod(objClass, methodName, argClasses);
    }

    /**
     * get Method
     * 
     * @param objClass
     * @param methodName
     * @param argClasses
     * @return
     * @throws Exception
     */
    public static Method getMethod(Class objClass, String methodName, Class argClasses[]) throws Exception {
        Method method = null;
        try {
            method = objClass.getDeclaredMethod(methodName, argClasses);
        } catch (Exception e) {
        }
        if (method == null) {
            try {
                method = objClass.getMethod(methodName, argClasses);
            } catch (Exception e) {
                // logger.debug(e);
            }
        }
        return method;
    }
}

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4. invokeMethod(Class clazz, Object obj, String methodName, Class[] parametersTypes, Object[] parameters)
5. invokeMethod(Class clazz, String methodName, Object[] args)
6. invokeMethod(Class clazz, E instance, String[] names, Object... args)
7. invokeMethod(Class clazz, Object object, String methodName, Class[] parameterTypes, Object[] parameters)
8. invokeMethod(Class clazz, String method, Class[] args, Object object, Object[] objects)
9. invokeMethod(Class clz, String methodName, Object... params)