Converting datatypes in Java

int to string

String myString = Integer.toString(my int value) or String str = "" + i;

String to int

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

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 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 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

integer to boolean

b = (i != 0);

boolean to integer

i = (b)?1:0;