Java/숫자와문자사이변환

1. ��

int i = 639;
String str = String.valueOf ( i );
String str = Integer.toString ( i );
String str = i.toString ( );
String str = "" + i;

2. ��

String str = "639";
int i = Integer.valueOf ( str ).intValue ( );
int i = Integer.parseInt ( str );
long i = Long.parseLong ( str )
double j = Double.valueOf ( str ).doubleValue ( );

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01, 02, ... , 09 String ��
int i_month = Integer.parseInt(s_month); 하�� 1, 2, 3 ... �� ...

3. �� 형��환

Float�� Integer��

float f = 3.25;
int i = ( int ) f;

double d = ( double ) i; // 플��트형

Object�� int �� 형��환 하�� ... �� String�� int�� 형��환 한��.
Integer.parseInt ( vector.elementAt ( 0 ).toString () );