項目地址（碼雲）：https://gitee.com/tdxm_bq/sizeyunsuan/

使用Android stdio編輯器

class Num {
    private int max = 100;
    private int min = 1;

    public int getMin() {
        return min;
    }

    public void setMin(int min) {
        this.min = min;
    }

    public int getMax() {
        return max;
    }

    public void setMax(int max) {
        this.max = max;
    }
    public int shu(){
        Random random = new Random();
        int s = random.nextInt(max)%(max-min+1) + min;
        return s;
    }
    public int fu(){
        Random random = new Random();
        int s = random.nextInt(4)%(4-1+1) + 1;
        return s;
    }
}
運算參數的隨機生成部分單獨創建了一個類來實現。

if(f == 1){
    s1 = a.shu();
    s2 = a.shu();
    s3 = s1 + s2;
    timu[0] = s1 + "+" +s2;
    jieguo[0] = Double.toString(s3);
}else if(f == 2){
    s1 = a.shu();
    s2 = a.shu();
    s3 = s1 - s2;
    timu[0] = s1 + "-" +s2;
    jieguo[0] = Double.toString(s3);
}else if(f == 3){
    s1 = a.shu();
    s2 = a.shu();
    s3 = s1 * s2;
    timu[0] = s1 + "*" +s2;
    jieguo[0] = Double.toString(s3);
}else if(f == 4){
    s1 = a.shu();
    s2 = a.shu();
    s3 = s1 / s2;
    timu[0] = s1 + "/" +s2;
    jieguo[0] = Double.toString(s3);
}

運算符用隨機生成數字來實現1~4對應4個運算符。

基本效果如上

《結對-四則運算生成器-開發過程》