數字轉成字符串

String s = String.valueOf( value); // 其中 value 為任意一種數字類型

字符串轉數字

String s = "169";

byte b = Byte.parseByte( s );

short t = Short.parseShort( s );

int i = Integer.parseInt( s );

long l = Long.parseLong( s );

Float f = Float.parseFloat( s );

Double d = Double.parseDouble( s );

數字與數字對象轉

byte b = 169;
Byte bo = new Byte( b ); b = bo.byteValue();
short t = 169;
Short to = new Short( t ); t = to.shortValue();
int i = 169;
Integer io = new Integer( i ); i = io.intValue();
long l = 169;
Long lo = new Long( l ); l = lo.longValue();
float f = 169f;
Float fo = new Float( f ); f = fo.floatValue();
double d = 169f;

Double dObj = new Double( d ); d = dObj.doubleValue();

Java數字與字符串的轉換