Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

import android.support.annotation.NonNull;

import java.lang.reflect.Constructor;

public class Main {
    @SuppressWarnings("unchecked")
    public static <T> T newInstance(@NonNull Class<T> cls) {
        final Constructor ctor = getDefaultConstructor(cls);
        try {
            return (T) ctor.newInstance();
        } catch (Throwable t) {
            t.printStackTrace();
            throw new RuntimeException("Failed to instantiate " + cls.getName() + ": " + t.getLocalizedMessage());
        }
    }

    private static Constructor<?> getDefaultConstructor(@NonNull Class<?> cls) {
        final Constructor[] ctors = cls.getDeclaredConstructors();
        Constructor ctor = null;
        for (Constructor ct : ctors) {
            ctor = ct;
            if (ctor.getGenericParameterTypes().length == 0)
                break;
        }
        if (ctor == null)
            throw new IllegalStateException("No default constructor found for " + cls.getName());
        ctor.setAccessible(true);
        return ctor;
    }
}