My Log

String[] s to List:

List l = Arrays.asList(s);

Long to long:

Long l;
l.longValue();

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( 0×10000 | 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)
{
}