Java : Convert from type X to type Y

[refer from http://www.rgagnon.com/javadetails/java-0004.html]

Convert from type X to type Y

integer to String :

int i = 42; String str = Integer.toString(i); or String str = "" + i

double to String :

String str = Double.toString(i);

long to String :

String str = Long.toString(l);

float to String :

String str = Float.toString(f);

String to integer :

str = "25"; int i = Integer.valueOf(str).intValue(); or int i = Integer.parseInt(str);

String to double :

double d = Double.valueOf(str).doubleValue();

String to long :

long l = Long.valueOf(str).longValue(); or long l = Long.parseLong(str);

String to float :

float f = Float.valueOf(str).floatValue();

decimal to binary :

int i = 42; String binstr = Integer.toBinaryString(i);

decimal to hexadecimal :

int i = 42; String hexstr = Integer.toString(i, 16); or String hexstr = Integer.toHexString(i); or (with leading zeroes and uppercase) public class Hex { public static void main(String args[]){ int i = 42; System.out.print (Integer.toHexString( 0x10000 | i).substring(1).toUpperCase()); } }

hexadecimal (String) to integer :

int i = Integer.valueOf("B8DA3", 16).intValue(); or int i = Integer.parseInt("B8DA3", 16);

ASCII code to String

int i = 64; String aChar = new Character((char)i).toString();

integer to ASCII code (byte)

char c = 'A'; int i = (int) c; // i will have the value 65 decimal

To extract Ascii codes from a String

String test = "ABCD"; for ( int i = 0; i < test.length(); ++i ) { char c = test.charAt( i ); int j = (int) c; System.out.println(j); }

integer to boolean

b = (i != 0);

boolean to integer

i = (b)?1:0;

note :To catch illegal number conversion, try using the try/catch mechanism.

try{ i = Integer.parseInt(aString); } catch(NumberFormatException e) { }

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