Averager.java

package com.lh.fly.common.assist;


import com.lh.fly.common.log.Log;

import java.util.ArrayList;

/**
 * 用以统计平均数
 *
 * @author MaTianyu
 *         2013-12-11下午3:31:03
 */
public class Averager {
    private static final String TAG = "Averager";
    private ArrayList<Number> numList = new ArrayList<Number>();

    /**
     * 添加一个数字
     *
     * @param num
     */
    public synchronized void add(Number num) {
        numList.add(num);
    }

    /**
     * 清除全部
     */
    public void clear() {
        numList.clear();
    }

    /**
     * 返回参与均值计算的数字个数
     *
     * @return
     */
    public Number size() {
        return numList.size();
    }

    /**
     * 获取平均数
     *
     * @return
     */
    public Number getAverage() {
        if (numList.size() == 0) {
            return 0;
        } else {
            Float sum = 0f;
            for (int i = 0, size = numList.size(); i < size; i++) {
                sum = sum.floatValue() + numList.get(i).floatValue();
            }
            return sum / numList.size();
        }
    }

    /**
     * 打印数字列
     *
     * @return
     */
    public String print() {
        String str = "PrintList(" + size() + "): " + numList;
        Log.i(TAG, str);
        return str;
    }

}