单例模式-饿汉式

package com.example.SpringBootTest1.shejimoshi.singleton;
public class HungrySingleton {
    private static final HungrySingleton hungrySingleton = new HungrySingleton();
    private HungrySingleton() {}

    public static HungrySingleton getInstance() {
        return hungrySingleton;
    }
}

public class Test {
    public static void main(String[] args) {
        HungrySingleton instance1 = HungrySingleton.getInstance();
        HungrySingleton instance2 = HungrySingleton.getInstance();
        System.out.println(instance1 == instance2); // true
    }
}