小学四则运算练习软件项目报告

public class Main {
    @SuppressWarnings("resource")
    public static void main(String[] args) throws ScriptException{
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入题目的个数\n");
        int n=sc.nextInt();
        new Question(n);
    }
}

    //实例化
    private void init(){
        random=new Random();
        ar=new ArrayList<String>();
        manager = new ScriptEngineManager();
        se = manager.getEngineByName("js");
    }

//生成随机题库并给出答案并输出
    private void ques() throws ScriptException{
        String qu = null;
        for(int i=0;i<n;i++){
            qu="";
            int time=t();
            for(int j=0;j<time;j++){
                qu=qu+ti();
                if(j<time-1){
                    qu=qu+type(ope());
                }
            }
            
            double result=Double.valueOf(se.eval(qu.toString()).toString()) ;
            if(result%1!=0 || result<0 || result>400){
                i--;
                continue;
            }
            ar.add(qu);            
        }
        wtf=new Transport("result.txt", ar, n);//输出
        
    }

//生成运算符
    private String type(int n){
        if(n==0){
            return "+";
        }else if(n==1){
            return "-";
        }else if(n==2){
            return "*";
        }else{
            return "/";
        }
    }