new Instance Any Parameter - Java Reflection

Java examples for Reflection:Constructor

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Description

new Instance Any Parameter

Demo Code


import java.lang.reflect.Constructor;

public class Main{
    public static void main(String[] argv) throws Exception{
        Class clazz = String.class;
        Object[] params = new String[]{"1","abc","level",null,"java2s.com","asdf 123"};
        System.out.println(newInstanceAnyParameter(clazz,params));
    }//from   w  w w .j  a v a2s . co m
    public static Object newInstanceAnyParameter(Class clazz,
            Object[] params) throws DIIException {
        try {
            return findConstructorWithParams(clazz, params.length)
                    .newInstance(params);
        } catch (Exception ex) {
            throw new DIIException(ex);
        }
    }
    private static Constructor findConstructorWithParams(Class clazz,
            int paramCount) throws NoSuchMethodException {
        Constructor[] inits = clazz.getConstructors();
        for (int i = 0; i < inits.length; ++i) {
            if (inits[i].getParameterTypes().length == paramCount) {
                return inits[i];
            }
        }
        throw new NoSuchMethodException("constructor for class '"
                + clazz.getName() + "' with " + paramCount + " parameters");
    }
}

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