对于每个方法调用，使用 int 通过字符串数组递增答案

【问题标题】：using ints to increment through a string array for each method invocation对于每个方法调用，使用 int 通过字符串数组递增
【发布时间】：2015-02-11 07:43:05
【问题描述】：

在一个类中，我在这里有一个方法，应该为每次调用添加到 int mWeight，然后每调用 3 次，移动通过 mSize 数组。在我调用 getter 的主要方法中，我没有在数组中获得任何更高的字符串值。

这里是相关的类变量和getter。

// Amount of weight to gain after eating
    final float WEIGHT_GAIN = 0.25f;

 // Its weight in pounds
    float mWeight;

// Size, either "tiny", "small", "average", or "large"
    String mSize[] = {"tiny", "small", "average", "large"};

 int dogSize;

String getSize(){
    return mSize[dogSize];

方法和它需要做什么。

/*
 * feed
 *
 * Feeds the Dog.
 *
 * Side-effect: 1. The Dog gains weight, specifically WEIGHT_GAIN
 *              2. Every 3 meals, the Dog grows to a larger size, if
 *                 possible
 *                 i.e. "tiny" (3 meals later ->) "small" (3 meals later ->)
 *                 "average" (3 meals later ->) "large"
 *                 the Dog cannot exceed the "large" size or shrink smaller than
 *                 "tiny"
 * @return nothing
 */ 

void feed(){
    while(mWeight < mSize.length)
    mWeight ++;
    mWeight = mWeight * WEIGHT_GAIN; 
    dogSize += (int)mWeight/3;
    if (dogSize > mSize.length)
    dogSize = mSize.length;
}

【问题讨论】：

你没有忘记while 后面的花括号吗？ dogSize 声明在哪里？
当我看到“每 3 次调用它”时，我在想实例范围计数器和模运算符。
已编辑。 dogGender 应该是 dogSize，在成员变量中声明。

标签： java arrays methods

【解决方案1】：

您可以为狗的用餐次数维护一个变量。

final float WEIGHT_GAIN = 0.25f;
String mSize[] = {"tiny", "small", "average", "large"};
class Dog{
        int num_meals, mWeight, dogSize;
        public Dog(int weight){
            num_meals = 0;
            dogSize = 0;
            mWeight = weight;
        }
        public String getSize(){
            return mSize[dogSize];
        }
        void feed(){
            mWeight += mWeight * WEIGHT_GAIN;
            num_meals++;
            dogSize = num_meals/3 < mSize.length-1 ? num_meals/3 : mSize.length - 1; 
        }
}

【讨论】：