data-server-java/src/main/java/com/tidecloud/dataacceptance/common/NumUtil.java

package com.tidecloud.dataacceptance.common;

import java.text.DecimalFormat;

/**   
 * @author: chudk 
 * @date:   2017年10月16日 下午4:30:53   
 */
public class NumUtil {
    
    public static Double toFixed2Place(Double num){
        if (num == null) {
            return null;
        }
        DecimalFormat df = new DecimalFormat("######0.0");
        return Double.valueOf(df.format(num));
    }
    
    public static void main(String[] args) {
        Double fixed2Place = NumUtil.toFixed2Place(1112.292d);
        System.out.println(fixed2Place);
    }
    
   public static byte[] int2bytes(int num)
    {
           byte[] b=new byte[4];
           //int mask=0xff;
           for(int i=0;i<4;i++){
                b[3-i]=(byte)(num>>>(24-i*8));
           }
          return b;
    }
   
   public static byte[] intToByte(int data, int length){
       byte[] bytes = new byte[length];
       bytes[0] = (byte)(data >> 8);
       bytes[1] = (byte)(data & 0xff);
       return bytes;
   }
   
   public static String byte2String(byte b) {
       if (b < 10) {
           return "0" + b;
       } else {
           return String.valueOf(b);
       }
   }
}