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public final class Test{
    public static int totalNumber= 5 ;
    public final int id;
    public Test(){
        id = ++totalNumber;
    }
       public static void main(String[] args) {
        Test t = new Test();
        System.out.println(t.id);      
        final int i = 10;
        final int j;
        j = 20;
        j = 30; //·Ç·¨£¬ÒòΪfinal±ê¼ÇµÄ±äÁ¿Ö»Äܱ»¸³ÖµÒ»´Î
        }
}


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