設計模式-單例模式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;    }}