Java Class New Instance newInstance(String className, Object... parameters)

Description

new Instance

License

LGPL

Declaration

public static Object newInstance(String className, Object... parameters) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.lang.reflect.*;

public class Main {
    public static Object newInstance(String className, Object... parameters) {
        try {/*from w w w  .j  a v a2 s .  c  o m*/
            Class<?> objClass = Class.forName(className);
            Constructor<?> constructor = getConstructor(objClass, parameters);

            if (constructor != null) {
                return constructor.newInstance(parameters);
            }
        } catch (Exception e) {
        }

        return null;
    }

    public static Constructor<?> getConstructor(Class<?> cls, Object... parameters) {
        Constructor<?> constructor = null;

        for (Constructor<?> classMethod : cls.getConstructors()) {
            Class<?>[] parametersType = classMethod.getParameterTypes();
            boolean match = false;

            if (parametersType.length == parameters.length) {
                match = true;
                for (int i = 0, length = parametersType.length; i < length; i++) {
                    if (parameters[i] != null) {
                        if (!parametersType[i].isAssignableFrom(parameters[i].getClass())) {
                            match = false;
                            break;
                        }
                    }
                }
            }

            if (match) {
                constructor = classMethod;
                break;
            }
        }
        return constructor;
    }
}

Related

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2. newInstance(String className, Class[] parmsCls, Object[] parms)
3. newInstance(String className, Object arg1)
4. newInstance(String className, Object... args)
5. newInstance(String className, Object... args)
6. newInstance(String className, Object... params)
7. newInstance(String className, Object[] args)
8. newInstance(String className, Object[] args)
9. newInstance(String className, Object[] args)