Java——值传递

//public class test1{int num = 1;public static void main(String[] args){ int x = 12;System.out.println("chage_pre X=" + x);change(x);System.out.println("chage_after X=" + x);}static void change(int x){System.out.println("in_chage_pre X=" + x);x = 20;System.out.println("in_chage_after X=" + x);}}