Java类型转换与时间处理-优快云博客

本文介绍了Java中字符串与基本类型的转换方法，包括String转double、int及double转Long的操作，并提供了两种从InputStream读取String的实现方式。此外，还展示了如何将毫秒数转换为易于理解的时间格式。

//String转double
String x = "154.5";
String y = "123.4";
double dx = Double.parseDouble(x);
double dy = Double.parseDouble(y);//String转换为double


//String转int
String x = "15";
        String y = "12";
        int dx = Integer.parseInt(x);
        int dy = Integer.valueOf(y).intValue();  //String转换为int
        Log.i(TAG , ""+ dx+ dy);




//double到Long
Long lUpdateMilis = updateMilis.longValue();//double转long




//inputStream转换成String（此方法效率高些）
 public static String inputStreamToString(InputStream in) throws IOException {
  StringBuffer out = new StringBuffer();
  byte[] b = new byte[4096];
  for (int n; (n = in.read(b)) != -1;) {
   out.append(new String(b, 0, n));
  }
  return out.toString();
 } 
 //inputStream转换成String
 public static String inputStream2String(InputStream is) throws IOException {


  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  int i = -1;
  while ((i = is.read()) != -1) {
   baos.write(i);
  }
  return baos.toString();
 }

long时间戳转时间

public static String getTime(int mss) {  
            int hours = (mss / (1000 * 60 * 60));  
            int minutes = (mss - hours * (1000 * 60 * 60)) / (1000 * 60);  
            int seconds = (mss - hours * (1000 * 60 * 60) - minutes * (1000 * 60)) / 1000;  
            return  hours + " hours " + minutes + " minutes "  
                    + seconds + " seconds ";  
        }