SCJP題庫第111題
Given:
15. public class Pass2{
16. public void static main(String[] args){
17. int x = 6;
18. Pass2 p = new Pass2();
19. .doStuff(x);
20. System.out.print(" main x = " + x);
21. }
22.
23. void doStuff(int x){
24. System.out.print(" doStuff x = " + x++);
25. }
26. }
And the command-line invocations:
javac Pass2.java
java Pass2 5
What is the result?
A. Compilation fails.
B. An exception is thrown at runtime.
C. doStuff x = 6 main x = 6
D. doStuff x = 6 main x = 7
E. doStuff x = 7 main x = 6
F. doStuff x = 7 main x = 7
Ans: C
解說:
此題是考call by value的觀念
19行將x=6傳進doStuff方法，6被複製給doStuff.x，印出後，doStuff.x++後結束doStuff方法
回到main方法之後，x還是為6…
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