int-> String
int i=12345;
String s= "";
The first method: s=i+ "";
The second method: S=string.valueof (i);
What is the difference between the two methods? function is not the same. Is it interchangeable in any case?
String-> int
S= "12345";
int i;
The first method: I=integer.parseint (s);
The second method: I=integer.valueof (s). Intvalue ();
What is the difference between the two methods? function is not the same. Is it interchangeable in any case?
Here's the answer:
The first method: s=i+ ""; Two string objects will be generated
The second method: S=string.valueof (i); Use a static method that directly uses the string class to produce only one object The first method: I=integer.parseint (s);//Direct use of static methods, does not produce redundant objects, but throws an exception
The second method: I=integer.valueof (s). Intvalue (),//integer.valueof (s) equals new Integer (Integer.parseint (s)), throws an exception, but produces an extra object |
--------------------------------------------------------------------1 How do I convert string string to 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 string turns into a Double, Float, Long with a similar method.
2 How do I convert an integer int to string string?
A. There are three approaches:
1.) String s = string.valueof (i);
2.) String s = integer.tostring (i);
3.) String s = "" + I;
Note: Double, Float, and Long turn into strings are very similar.
Java Data type conversions
This is an example of the conversion of data numbers in Java. For everyone to learn
Package Shenmixiaozhu;
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 all can be found in the Java API, organize a backup. Transferred from http://blog.sina.com.cn/s/blog_4f9d6b1001000bfo.html
