java中一个方法改变另外一个方法里面的变量

Question

这是一道面试题，我做不出来 ，请教一下

Answer 1

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Answer 2

import java.io.PrintStream;public class Demo3 {            public static void main(String[] args) {                   int a = 10;                  int b = 20;                   method(a,b);                  System.out.println("a="+a);                  System.out.println("b="+b);         }               public static void method(int a,int b){                     System.setOut(new PrintStream(System.out,true){                                public void println(String x){                                          super.println(x+'0');              }          });     } }

Answer 3

 暂时只想到这种方法。。。