[置顶] JAVA基本类型互相转换

/** * <p>TypeChange.java * <p>JAVA基本类型互相转换 * * @author heardy * @time 2011/01/30 * @version 1.0 */ public class TypeChange { /** * 转为字符串 * * @param obj * @return 为null时返回空字符串 */ public static String objectToString(Object obj) { String str = ""; try { str = (String) obj; if (str == null) { str = ""; } } catch (ClassCastException ce) { try { str = String.valueOf(obj); } catch (Exception e) { str = ""; } } return str.trim(); } /** * 转null为空字符 * * @param str * @return */ public static String nullOfString(Object obj) { String str = objectToString(obj); return str; } /** * 转null为Int * * @param obj * @return */ public static int nullOfInt(Object obj) { return objectToInt(obj); } // *****************Object 转 其他类型***************** /** * 转字节 * * @param str * @return * @throws 如果无法转换 * 抛出 NumberFormatException */ public static byte objectToByte(Object obj) { String str = objectToString(obj); str = nullOfString(str); try { return Byte.parseByte(str); } catch (NumberFormatException e) { System.out.println("转换出错" + e); throw e; } } /** * 转布尔 * * @param str * @return 为1或"true"返回真 否则假 */ public static boolean objectToBoolean(Object obj) { String str = objectToString(obj); if (str.equals("1")) { return true; } else if (str.equals("0")) { return false; } else { try { return Boolean.parseBoolean(str); } catch (Exception e) { return false; } } } /** * 转Int * * @param str * @return 相应的值 或 零 */ public static int objectToInt(Object obj) { String str = objectToString(obj); int i = 0; try { i = Integer.parseInt(str.trim()); } catch (NumberFormatException e) { i = 0; } return i; } /** * 转short * * @param obj * @return 相应的值 或 零 */ public static short objectToShort(Object obj) { String str = objectToString(obj); short i = 0; try { i = Short.parseShort(str.trim()); } catch (NumberFormatException e) { i = 0; } return i; } /** * 转Double * * @param obj * @return 相应的值 或 零 */ public static double objectToDouble(Object obj) { String str = objectToString(obj); double i = 0; try { i = Double.parseDouble(str.trim()); } catch (NumberFormatException e) { i = 0; } return i; } /** * 转Long * * @param obj * @return 相应的值 或 零 */ public static long objectToLong(Object obj) { String str = objectToString(obj); Long li = new Long(0); try { li = Long.valueOf(str); } catch (NumberFormatException e) { } return li.longValue(); } // ***************** 其他类型相互转换 ***************** /** * double转long * * @param d * @return 只截取前面的整数 */ public static long doubleToLong(double d) { long l = 0; try { // double转换成long前要过滤掉double类型小数点后数据 l = Long.parseLong(String.valueOf(d).substring(0, String.valueOf(d).lastIndexOf("."))); } catch (Exception e) { l = 0; } return l; } /** * double转int * * @param d * @return 只截取前面的整数 */ public static int doubleToInt(double d) { int i = 0; try { // double转换成Int前要过滤掉double类型小数点后数据 i = Integer.parseInt(String.valueOf(d).substring(0, String.valueOf(d).lastIndexOf("."))); } catch (Exception e) { i = 0; } return i; } /** * double转long(四舍五入) * * @param d * @return 只截取前面的整数 (四舍五入) */ public static long doubleToLongWhithRound(double d) { long l = 0; try { l = Math.round(d); } catch (Exception e) { l = 0; } return l; } /** * double转int(四舍五入) * * @param d * @return 只截取前面的整数 (四舍五入) */ public static int doubleToIntWhithRound(double d) { int i = 0; try { i = (int) Math.round(d); } catch (Exception e) { i = 0; } return i; } public static double longToDouble(long d) { double l = 0; try { l = Double.parseDouble(String.valueOf(d)); } catch (Exception e) { l = 0; } return l; } public static int longToInt(long d) { int l = 0; try { l = Integer.parseInt(String.valueOf(d)); } catch (Exception e) { l = 0; } return l; } }

 

实现了基本类型的转换...

 

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