创建对象实例的其它方式.

import java.lang.reflect.Constructor;

public class TestCreateInstance {

	public static void main(String[] args) throws Exception {
		Instance i1 = (Instance) Instance.class.newInstance();
		i1.setId("one");
		System.out.println(i1);

		Instance i2 = null;
		Constructor<Instance> cons = Instance.class
				.getConstructor(String.class);
		Constructor<Instance> defaultCons = Instance.class
				.getConstructor((Class[]) null);// get the default constructor
												// of a class
		System.out.println(cons);
		System.out.println(defaultCons);
		i2 = cons.newInstance("two");
		System.out.println(i2);

	}

}

class Instance {
	String id;

	public Instance() {

	}

	public String getId() {
		return id;
	}

	public Instance(String id) {
		this.id = id;
	}

	public void setId(String id) {
		this.id = id;
	}

	@Override
	public String toString() {
		return "Instance [id=" + id + "]";
	}

}