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 bin = 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);

char to String:

String s = String.valueOf('c');

integer to ASCII code (byte):

char c = 'A'; int i = (int) c; // i == 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); // ex : 42 != 0 --> true

boolean to integer:

i = (b)?1:0; // true --> 1