implements java.io.Serializable与implements Serializable的区别

请先看两段代码

package com.jadyer.base;
public class User implements java.io.Serializable{
	private static final long serialVersionUID = 2035637204889097968L;
	
	private Integer age;
	
	public Integer getAge() {
		return age;
	}
	
	public void setAge(Integer age) {
		this.age = age;
	}
}

package com.jadyer.base;
import java.io.Serializable;
public class User implements Serializable{
	private static final long serialVersionUID = 2035637204889097968L;
	
	private Integer age;
	
	public Integer getAge() {
		return age;
	}
	
	public void setAge(Integer age) {
		this.age = age;
	}
}

同样是实现序列化接口，那么这两种书写方式将导致JVM在底层处理上有何差异呢......