泛型化单例模式实例-MyEclipse, Maven, Junit

泛型化单例模式，关键点为Class.newInstance()，构建无参的Class类的实例。写个例子记录一下（MyEclipse maven）：

src/main/java源文件夹下：

club.younge.demo下新建单例获取类和实体类（Singleton, Student）

Singleton:

package club.younge.demo;

import java.util.concurrent.ConcurrentHashMap;

/**
 * 泛型化单例模式
 * 
 * @author Younge
 *
 */
public class Singleton {
	@SuppressWarnings("rawtypes")
	private static final ConcurrentHashMap<Class, Object> MAP = new ConcurrentHashMap<Class, Object>();

	@SuppressWarnings("unchecked")
	public static <T> T getInstance(Class<T> type) {
		Object object = MAP.get(type);
		if (object == null) {
			try {
				synchronized (MAP) {
					object = type.newInstance(); //关键部分，通过类型创建无参实例
					MAP.put(type, object);
				}
			} catch (InstantiationException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {

				e.printStackTrace();
			}
		}
		return (T) object;
	}
	public static <T> void remove(Class<T> type){
		MAP.remove(type);
	}
}

Student:

package club.younge.demo;

public class Student {
	private String number;
	private String name;
	public String getNumber() {
		return number;
	}
	public void setNumberAndName(String number, String name){
		this.number = number;
		this.name = name;
	}
	public void setNumber(String number) {
		this.number = number;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public String toString() {
		return new StringBuilder()
		.append("I am a student, my number is ")
		.append(this.number).append(",my name is ")
		.append(this.name).toString();
	}
	
}

src/test/java源文件夹下：

club.younge.demo下新建测试类（TestCC）

TestCC:

package club.younge.demo;

import org.junit.Test;

public class TestCC {

	@Test
	public void testSingleTon(){
		Student student = Singleton.getInstance(Student.class);
		student.setNumberAndName("123", "Haha");
		System.out.println(student);
	}
}

测试结果：

I am a student, my number is 123,my name is Haha