package staticinit.one;public class Main1 {
        public static void main(String[] args) {        System.out.println("第一遍初始化StaticOrInstance...");        new StaticOrInstance();        System.out.println("第二遍初始化StaticOrInstance...");        new StaticOrInstance();        /*         * 输出结果：         * 第一遍初始化StaticOrInstance...         * Mug(3)         * Mug(4)         * Mug(1)         * Mug(2)         * StaticOrInstance constructor...         * 第二遍初始化StaticOrInstance...         * Mug(1)         * Mug(2)         * StaticOrInstance constructor...         */    }}class StaticOrInstance {    public Mug mug1;    public Mug mug2;    public static Mug mug3;    public static Mug mug4;    {        mug1 = new Mug(1);        mug2 = new Mug(2);    }    static {        mug3 = new Mug(3);        mug4 = new Mug(4);    }    public StaticOrInstance() {        System.out.println("StaticOrInstance constructor...");    }}class Mug {    public Mug() {    }    public Mug(int i) {        System.out.println("Mug(" + i + ")");    }}

注：1.在类初始化时，先初始化静态块或变量，再初始化非静态块或变量（StaticOrInstance类中静态块位于非静态块后面，但是输出结果中静态块先初始化）；2.静态块或变量只会在第一次初始化时初始化，而非静态块或变量会在每一次类初始化时执行初始化（在第二次初始化时静态块没有再次初始化）；3.静态块（变量）和非静态块（变量）均在构造方法之前被初始化。