new Generic Instance - Android java.lang.reflect

Android examples for java.lang.reflect:Constructor

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Description

new Generic Instance

Demo Code


//package com.java2s;
import java.lang.reflect.Constructor;

public class Main {

    public static <T> T newInstance(Class<T> claxx) throws Exception {
        Constructor<?>[] cons = claxx.getDeclaredConstructors();
        for (Constructor<?> c : cons) {
            Class[] cls = c.getParameterTypes();
            if (cls.length == 0) {
                c.setAccessible(true);/*  w  w w  .ja v  a  2  s  . co  m*/
                return (T) c.newInstance();
            } else {
                Object[] objs = new Object[cls.length];
                for (int i = 0; i < cls.length; i++) {
                    objs[i] = getDefaultPrimiticeValue(cls[i]);
                }
                c.setAccessible(true);
                return (T) c.newInstance(objs);
            }
        }
        return null;
    }

    public static Object getDefaultPrimiticeValue(Class clazz) {
        if (clazz.isPrimitive()) {
            return clazz == boolean.class ? false : 0;
        }
        return null;
    }
}

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