1.Integer转换成int的方法
Integer i = new Integer(10);
int k = i.intValue();
即Integer.intValue();
2.int转换成Integer
int i = 10;
Integer it = new Integer(i);
3.String转换成int的方法
String str = "10";
Integer it = new Interger(str);
int i = it.intValue();
即：int i = Integer.intValue(string);
4.int转换成String
int i = 10;
(1)String s = String.valueOf(i);
(2)String s = Ingeger.toString(i);
(3)String s = "" + i;
5.String转换成Integer
String str = "10";
Integer it = Integer.valueOf(str);
6.Integer转换成String
Integer it = new Integer(10);
String str = it.toString();
7.String转换成BigDecimal
BigDecimal bd = new BigDecimal(str);
8.日期
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH)+1;
int day = calendar.get(Calendar.DATE);
//获取今天的日期字符串
String today = java.text.DateFormat.getDateInstance().format(new java.util.Date());
//获取今天的日期
new java.sql.Date(System.currentTimeMillis());
JAVA的整型与字符串相互转换
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 cn.com.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 integer.intValue();
}
//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->byte
Byte static byte parseByte(String s)
byte->string
Byte static String toString(byte b)
char->string
Character static String to String (char c)
string->Short
Short static Short parseShort(String s)
Short->String
Short static String toString(Short s)
String->Integer
Integer static int parseInt(String s)
Integer->String
Integer static String tostring(int i)
String->Long
Long static long parseLong(String s)
Long->String
Long static String toString(Long i)
String->Float
Float static float parseFloat(String s)
Float->String
Float static String toString(float f)
String->Double
Double static double parseDouble(String s)
Double->String
Double static String toString(Double d)