Android-Java-饿汉式单例模式(内存图)

package android.java.oop14;

public class Single {

    // 默认构造方法 私有化 不让外界调用
    private Single() {}

    private static final Single SINGLE = new Single();

    public static Single getSingle() {
        return SINGLE;
    }

    public void printlnData() {
        System.out.println("---> 显示数据...");
    }
}

package android.java.oop14;

public class SingleDemo {

    public static void main(String[] args) {

        Single single = Single.getSingle();

        single.printlnData();

    }

}