单例模式

package top.xedxed.design.singleton;
/**
 * @Author: xieed
 * @Description: 单例模式
 * @Date: Created in 11:01 2018-4-26
 * @Modified By:
 */
public class SingletonFristClass {

    private String version;

    private static class SingletonClassInstance{
        private static SingletonFristClass instance = new SingletonFristClass().setVersion(""+System.currentTimeMillis());
    }

    public static  SingletonFristClass getInstance(){
        return SingletonClassInstance.instance;
    }

    public String getVersion() {
        return version;
    }

    public SingletonFristClass setVersion(String version) {
        this.version = version;
        return this;
    }
}