public class Pf {public static void main(String[] args) {int a = 2;int b = a * a;System.out.println(b);}} 也可以这样public class Pf {public static void main(String[] args) {int a = 2;int b = A(a);System.out.println(b);}private static int A(int a) {return a*a;}}...
