问题1--static final关键词

如下面所述代码,scf输出scf = SelfCounter id,后面id递增,可以理解。而由于scsf被static final修饰了,无论再new多少次输出都不会变,但是为什么输出是0而不是1呢?百思不得解,小白求拍求解答!

class SelfCounter {
  private static int count;
  private int id = count++;
  public String toString() { return "SelfCounter " + id; }
}

class WithFinalFields {
  final SelfCounter scf = new SelfCounter();
  static final SelfCounter scsf = new SelfCounter();
  public String toString() {
    return "scf = " + scf + "\nscsf = " + scsf;
  }
}
public class Final_Static {
  public static void main(String args[]) {
    System.out.println("First object:");
    System.out.println(new WithFinalFields());
    System.out.println("Second object:");
    System.out.println(new WithFinalFields());
  }
}/* Output: 

First object:
scf = SelfCounter 1
scsf = SelfCounter 0
Second object:
scf = SelfCounter 2
scsf = SelfCounter 0
*///:~

posted @ 2018-04-21 16:09  小熊hit  阅读(271)  评论(3编辑  收藏  举报