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
*///:~