자바 형 변환 - String 과 Double,Float String to double,float String s = "10"; double d = Double.valueOf(s); float f = Float.valueOf(s); double, float to String String s; float f = 10.1; double d = 10.2; /* float -> String */ s = String.valueOf(f); s = Float.toString(f); /* double -> String */ s = String.valueOf(d); s = Float.toString(d);