文件1 导入java.util.Scanner; 公共类方法{public static void main（String [] args）{Scanner sc = new Scanner（System.in）; System.out.print（“输入a：”）; int a = sc.nextInt（）; System.out.print（“ Enter b：”）; int b = sc.nextInt（）; int add = add（a，b）; int sub = sub（a，b）;