Before Swap, a is 10 Before Swap, b is 50 After Swap a is 10 After Swap b is 50 Before Swap i is 5 Before Swap j is 9 After Swap i is 5 After Swap j is 9
因为swap方法接收到的是引用参数的副本（传值），对他们的修改不会反射到调用代码。
译者注：在传递引用和原始类型时还是有不同的，考虑以下的代码：
class Change { public static void main(String args[]) { StringBuffer a=new StringBuffer(\"ok\"); int i; i = 5; System.out.println(\"Before change, a is \" + a); change(a); System.out.println(\"After change a is \" + a); System.out.println(\"Before change i is \" + i); change(i); System.out.println(\"After change i is \" + i); } public static void change(StringBuffer ia) { ia.append(\" ok?\"); } public static void change(int li) { li = 10; } }
程序的输出为：
Before change, a is ok
After change a is ok ok? Before change i is 5 After change i is 5
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