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