1、Class類方法：getConstructors()

2、Constructor物件的newInstance()

public T newInstance(Object... initargs)
              throws InstantiationException,
                     IllegalAccessException,
                     IllegalArgumentException,
                     InvocationTargetException

3、實驗程式

// ConstructorTest.java
import java.lang.reflect.*;
class OtherConstructor {
	public OtherConstructor(float b, int i) {
		System.out.println("OtherConstructor(float, int): " + b + " " + i);
	}
	public OtherConstructor(String s) {
		System.out.println("OtherConstructor(String): " + s);
	}
	public OtherConstructor(int i) {
		System.out.println("OtherConstructor(int): " + i);
	}
}

public class ConstructorTest {
	public static void main(String[] args) {
		Constructor[] ctors = OtherConstructor.class.getConstructors();
		for(Constructor ctor : ctors)
			System.out.println(ctor);
		try {
			ctors[0].newInstance(1.2F, 5);
			ctors[1].newInstance("Hello");
			ctors[2].newInstance(45);
		} catch(Exception e) {
			throw new RuntimeException(e);
		}
	}
}