java类型转换IntegerStringLongFloatDoubleDate.doc

java类型转换?Integer?String?Long?Float?Double?Date ? 1如何将字串 String 转换成整数 int? A. 有两个方法: 1). int i = Integer.parseInt([String]); 或i = Integer.parseInt([String],[int radix]); 2). int i = Integer.valueOf(my_str).intValue(); 注: 字串转成 Double, Float, Long 的方法大同小异. 2 如何将整数 int 转换成字串 String ? A. 有叁种方法: 1.) String s = String.valueOf(i); 2.) String s = Integer.toString(i); 3.) String s = + i; 注: Double, Float, Long 转成字串的方法大同小异. JAVA数据类型转换????? ynniebo [收藏]??关键字??? 类型转换出处????这是一个例子,说的是JAVA中数据数型的转换.供大家学习引 package .lwkj.erts.register;import java.sql.Date;public class TypeChange {?? public TypeChange() {?? }?? //change the string type to the int type?? public static?? int stringToInt(String intstr)?? {???? Integer integer;???? integer = Integer.valueOf(intstr);???? return Value();?? }?? //change int type to the string type?? public static String intToString(int value)?? {???? Integer integer = new Integer(value);???? return integer.toString();?? }?? //change the string type to the float type?? public static?? float stringToFloat(String floatstr)?? {???? Float floatee;???? floatee = Float.valueOf(floatstr);???? return floatee.floatValue();?? }?? //change the float type to the string type?? public static String floatToString(float value)?? {???? Float floatee = new Float(value);???? return floatee.toString();?? }?? //change the string type to the sqlDate type?? public static java.sql.Date stringToDate(String dateStr)?? {???? return?? java.sql.Date.valueOf(dateStr);?? }?? //change the sqlDate type to the string type?? public static String dateToString(java.sql.Date datee)?? {???? return datee.toString();?? } ?? public static void main(String[] args)?? {???? java.sql.Date day ;???? day = TypeChange.stringToDate(2003-11-3);???? String strday = TypeChange.dateToString(day);???? System.out.println(strday);?? } } JAVA中常用数据类型转换函数虽然都能在JAVA API中找到，整理一下做个备份。 string-byteByte static byte parseByte(String s)?? byte-stringByte static String t