生成小学加减口算题JAVA算法

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生成小学加减口算题JAVA算法

package com.jianchi.fsp.generationchildrenarithmetic;import java.io.Serializable;import java.util.ArrayList;import java.util.List;import java.util.Random;/** * Created by fsp on 16-6-20. */public class GenHelper implements Serializable {    //每道题的数字数，比如 2 , 3 ,4    public int numberNum;    //生成题的数量    public int createCount;    //运算类型    public String calculationMethod;    //数值范围    public int resultRange;    public List<String> make() {        Random r = new Random();        Boolean[] methods = new Boolean[numberNum - 1];        int[] nums = new int[numberNum];        List<String> l = new ArrayList<>();        for (int count = 0; count < createCount; count++) {            for (int i = 0; i < methods.length; i++) {                if (calculationMethod.equals("混合"))                    methods[i] = r.nextInt(2) == 0;//生成  0 ， 1， 0 为 true 为 加法                else if (calculationMethod.equals("加法"))                    methods[i] = true;//生成  0 ， 1                else if (calculationMethod.equals("减法"))                    methods[i] = false;//生成  0 ， 1            }            while (true) {                for (int i = 0; i < nums.length; i++) {                    nums[i] = r.nextInt(resultRange + 1);                }                if (test(methods, nums)) {                    l.add(String.valueOf(count + 1) + ".    " + create(methods, nums));                    break;                }            }        }        return l;    }    String create(Boolean[] methods, int[] nums) {        StringBuilder sb = new StringBuilder();        sb.append(nums[0]);        for (int i = 0; i < methods.length; i++) {            sb.append(" ").append(methods[i] ? "+" : "-").append(" ").append(nums[i + 1]);        }        sb.append(" ").append("=");        return sb.toString();    }    boolean test(Boolean[] methods, int[] nums) {        int d = nums[0];        for (int i = 0; i < methods.length; i++) {            d = methods[i] ? d + nums[i + 1] : d - nums[i + 1];            if (d < 0 || d > resultRange)                return false;        }        return true;    }}

项目源码地址

https://code.csdn.net/do168/generationchildrenarithmetic

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