Converting datatypes in Java

integer to String

String myString = Integer.toString(my int value) 

or

String str = "" + i;

String to integer

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)

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 (int) to char

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

char to integer

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

char to String

char c = 'A';
String str = Character.toString(c);

String to char

String str = "A";
char c = str.charAt(0);

integer to boolean

b = i != 0;

boolean to integer

i = b ? 1 : 0;