java 类静态变量加载

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原文

class Singleton {
    private static Singleton singleton = new Singleton();
    public static int count1;
    public static int count2 = 3;

    private Singleton() {
        count1++;
        count2++;
    }

    public static Singleton getInstance() {
        return singleton;
    }
}

public class Test {
    public static void main(String[] args) {
        Singleton singleTon = Singleton.getInstance();
        System.out.println("count1=" + singleTon.count1);
        System.out.println("count2=" + singleTon.count2);
    }
}

class Singleton {
    public static int count1;
    public static int count2 = 3;
    private static Singleton singleton = new Singleton();

    private Singleton() {
        count1++;
        count2++;
    }

    public static Singleton getInstance() {
        return singleton;
    }
}

public class Test {
    public static void main(String[] args) {
        Singleton singleTon = Singleton.getInstance();
        System.out.println("count1=" + singleTon.count1);
        System.out.println("count2=" + singleTon.count2);
    }
}

javap -c Singleton.class 反汇编一下字节码文件，查看顺序

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