[IT] Java, Python, JavaScript 타입 변환 (From \ To)

※ Java

From \ To	int x	long x	double x	boolean x	String x	Object x
int i	int x = i;	long x = i;	double x = i;	boolean x = (i != 0);	String x = String.valueOf(i);	Object x = Integer.valueOf(i);
long l	int x = (int) l;	long x = l;	double x = l;	boolean x = (l != 0L);	String x = String.valueOf(l);	Object x = Long.valueOf(l);
double d	int x = (int) d;	long x = (long) d;	double x = d;	boolean x = (d != 0.0);	String x = String.valueOf(d);	Object x = Double.valueOf(d);
boolean b	int x = (b ? 1 : 0);	long x = (b ? 1L : 0L);	double x = (b ? 1.0 : 0.0);	boolean x = b;	String x = String.valueOf(b);	Object x = Boolean.valueOf(b);
String s	int x = Integer.parseInt(s.trim());	long x = Long.parseLong(s.trim());	double x = Double.parseDouble(s.trim());	boolean x = Boolean.parseBoolean(s.trim());	String x = s;	Object x = s;
Object obj	int x = Integer.parseInt(String.valueOf(obj).trim());	long x = Long.parseLong(String.valueOf(obj).trim());	double x = Double.parseDouble(String.valueOf(obj).trim());	boolean x = Boolean.parseBoolean(String.valueOf(obj).trim());	String x = String.valueOf(obj);	Object x = obj;

 

※ Python

From \ To	int x	float x	bool x	str x	list x	dict x	None x
int i	x = int(i)	x = float(i)	x = bool(i)	x = str(i)	x = list(str(i))		x = None
float f	x = int(f)	x = float(f)	x = bool(f)	x = str(f)	x = list(str(f))		x = None
bool b	x = int(b)	x = float(b)	x = bool(b)	x = str(b)			x = None
str s	x = int(s)	x = float(s)	x = bool(s)	x = s	x = list(s)	x = json.loads(s)	x = None
list lst			x = bool(lst)	x = str(lst)	x = list(lst)
dict dic			x = bool(dic)	x = str(dic)		x = dict(dic)
None n			x = False	x = "None"			x = None

 

※ JavaScript

From \ To	Number x	String x	Boolean x	Object x	Array x
Number n	x = Number(n)	x = String(n)	x = Boolean(n)	x = Object(n)	x = [n]
String s	x = Number(s)	x = String(s)	x = Boolean(s)	x = Object(s)	x = s.split("")
Boolean b	x = Number(b)	x = String(b)	x = Boolean(b)	x = Object(b)	x = [b]
Object obj	x = Number(obj)	x = String(obj)	x = Boolean(obj)	x = obj	x = Object.values(obj)
Array arr	x = Number(arr)	x = String(arr)	x = Boolean(arr)	x = Object(arr)	x = arr
null	x = 0	x = "null"	x = false
undefined	x = NaN	x = "undefined"	x = false