package springbook.learningtest.jdk;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

import java.lang.reflect.Method;
import java.util.Date;

import org.junit.Test;


public class Reflection {
	@Test
	public void invokeMethod() throws Exception {
		String name = "Spring";

		// length
		assertThat(name.length(), is(6));
		
		Method lengthMethod = String.class.getMethod("length");
		assertThat((Integer)lengthMethod.invoke(name), is(6));
		
		// toUpperCase
		assertThat(name.charAt(0), is('S'));
		
		Method charAtMethod = String.class.getMethod("charAt", int.class);
		assertThat((Character)charAtMethod.invoke(name, 0), is('S'));
	}
	
	@Test 
	public void createObject() throws Exception {
		Date now = (Date) Class.forName("java.util.Date").newInstance();
	}
}