3.上海郊区某家公司自己眼瞎做错的题

public static void main(String[] args) {
    int result = 0;
    int i = 2;
    switch (i) {
        case 1:
                result = result + i;       //i为2,此处不运行
            System.out.println(" "+result);   //不输出
        case 2:
            result = result + i * 2;//4    result=0+2*2=4
            System.out.println("  "+result);
        case 3:
            result = result + i * 3;//10     result=4+2*3=10
    }
    System.out.println(result);
}