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) { }
v

本文地址：http://com.8s8s.com/it/it18881.htm