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String to int
int i = Integer.parseInt(str);

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

double to String
String str = Double.toString(d);

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();

long l = Long.parseLong(str);

String to float
float f = Float.valueOf(str).floatValue();

decimal to binary
String binstr = Integer.toBinaryString(i);

decimal to hexadecimal
String hexstr = Integer.toString(i, 16);

String hexstr = Integer.toHexString(i);

Integer.toHexString( 0x10000 | i).substring(1).toUpperCase());

hexadecimal(String) to int
int i = Integer.valueOf("B8DA3", 16).intValue();

int i = Integer.parseInt("B8DA3", 16);

ASCII Code to String
String char = new Character((char)i).toString();

Integer to ASCII Code
int i = (int) c;

Integer to boolean
boolean b = (i != 0);

boolean to Integer
int i = (b)? 1 : 0;