Java integer and String Conversion

1 how to convert a string to an integer Int?

A. There are two methods:

1). Int I = integer. parseint ([String]); or

I = integer. parseint ([String], [int Radix]);

2). Int I = integer. valueof (my_str). intvalue ();

Note: The methods for converting strings to double, float, and long are similar.

2. How do I convert an integer int to a string?

A. There are three methods:

1.) string S = string. valueof (I );

2.) string S = integer. tostring (I );

3.) string S = "" + I;

Note: the conversion of double, float, and long into strings is similar.

Conversion of Java data types to ynniebo [favorites]

Keyword type conversion

Source

This is an example of data type conversion in Java.

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 );

}

}

Common data type conversion functions in Java

Although they can all be found in Java API, sort out and make a backup.

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)