public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入分数1:");
        float scor1 = sc.nextFloat();
        System.out.println("请输运算符号");
        String str = sc.next();
        System.out.println("请输入分数2:");
        float scor2 = sc.nextFloat();
        System.out.println("结果是: " + util(scor1, str, scor2));

    }

    public static float util(float scor1, String str, float scor2) {
        float rs = 0;
        if (str.equalsIgnoreCase("+")) {
            rs = scor1 + scor2;
        } else if (str.equalsIgnoreCase("-")) {
            rs = scor1 - scor2;
        } else if (str.equalsIgnoreCase("*")) {
            rs = scor1 * scor2;
        } else if (str.equalsIgnoreCase("/")) {
            rs = scor1 / scor2;
        } else {
            return 0;
        }
        return rs;

    }

}