设计模式-单例模式code

package singeton;

import java.security.SecureRandom;

/** * @author Zero * @since 2019-08-13. * Description: */public class HungrySingleton {    private static final HungrySingleton singleton = new HungrySingleton();    private final int ID = new SecureRandom().nextInt();

    private HungrySingleton() {    }

    public static HungrySingleton getSingleton() {        return singleton;    }

    public int doSomething() {//        System.out.println("I'm HungrySingeton " + ID + "!");        return ID;    }}

package singeton;

import java.security.SecureRandom;

/** * @author Zero * @since 2019-08-13. * Description: */public class LazySingleton {    private static LazySingleton singeton = null;    private final int ID = new SecureRandom().nextInt();

    private LazySingleton() {    }

    public static synchronized LazySingleton getSingleton() {        if (singeton == null) {            singeton = new LazySingleton();        }        return singeton;    }

    public int doSomething() {//        System.out.println("I'm LazySingeton " + ID + "!");        return ID;    }

}