A. there are two methods:
1).int I = integer . parse int([String])； or
i = Integer.parseInt([String]，[int radix])；
2).int i = Integer.valueOf(my_str)。 int value()；
Note: the method of converting strings into double, float and long is similar.
2 how to convert integer int into string?
A. there are three ways:
1.)String s = String . value of(I)；
2.)String s = integer . tostring(I)；
3.) String s = ""+i;
Note: Double, float and long are converted to strings in a similar way.
Java data type conversion ynniebo[ collection]
Keyword type conversion
source
This is an example of data conversion in JAVA. For everyone to learn.
Package cn.com.lwkj.erts.register;
Import java.sql.date;
Public class type change {
public TypeChange() {
}
//Change the string type to int type
Public static int String point(String intstr)
{
Integer；;
integer = integer . value of(intstr)；
Returns integer. intvalue ();
}
//change int type to string type.
Public static string intToString(int value)
{
Integer integer = new integer (value);
Returns integer. tostring ();
}
//Change the string type to floating-point type
Common static floating-point stringToFloat(String floatstr)
{
Float float;
float ee = float . value of(float str)；
Returns floatee. floatvalue ();
}
//Change floating-point type to string type
Public static string floatToString (floating point value)
{
FloatFloat = new float (value);
Returns floatee.tostring ();
}
//Change the string type to sqlDate type.
Public static java.sql.datestringtote (string datestr)
{
Returns java.sql.date.valueof (datestr);
}
//change sqlDate type to string type.
Public static string datetostring (java.sql.datedatee)
{
return datee . tostring()；
}
Public static void main(String[] args)
{
Java.sql.Date day;
day = type change . string tote(" 2003- 1 1-3 ")；
Stringstrday = typechange.datetostring (day);
system . out . println(strday)；
}
}
Common data type conversion functions in JAVA
Although it can be found in JAVA API, tidy it up and make a backup.
String-> byte
Byte static byte analysis byte (string s)
Bytes-> line
Byte static string to string (byte b)
char-& gt； line
Character static string to string (char c)
String-> short
Short static short parseShort (string s)
Short->; line
Short static string toString (short s)
String-> integer
Integer static int parseInt (string s)
Integer-> line
Integer static string tostring(int i)
String-> long
Long static long parseLong (string s)
long->； line
Long static string toString(Long i)
String-> float
Floating-point static floating-point parseFloat (string s)
Floating-> line
Converts a static string to a string (floating point f)
String-> double；twofold
Double static double parseDouble (string s)
double-& gt； line
Double static string toString (double d)