java个人练习

    xiaoxiao2021-03-25  108

    (1)

    构造器调用顺序: 一在类的内部,变量定义的先后顺序决定了初始化的顺序。即使变量定义散布于方法定义之间,它们仍旧会在任何方法(包括构造器)被调用之前得到初始化。 class Tag {                     Tag(int marker)

                         {                       System.out.println("Tag(" + marker + ")");                      }                    }

    class Card {                    Tag t1 = new Tag(1); // Before constructor                    Card() {                                  System.out.println("Card()");                                  t3 = new Tag(33);                                 }                                Tag t2 = new Tag(2); // After constructor                      void f() {                                     System.out.println("f()");                                   }                     Tag t3 = new Tag(3); // At end                    }

    public class OrderOfInitialization

    {       public static void main(String[] args)

     {     Card t = new Card();    t.f(); // Shows that construction is done  } } 结果应该为

    tag(1)

    tag(2)

    tag(3)

    card()

    tag(33)

    f()

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