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);

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 i = (int) c;

System.out.println(i);

}

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) { }