자주 쓰는 형변환 정리

1) int to String
String str = Integer.toString(i);

2) String to int
int i = Integer.parseInt(str);

3) double to String
String str = Long.toString(d);

4) String to double
double d = Double.valueOf(str).doubleValue();

5) long to String
String str = Long.toString(l);

6) String to long
long l = Long.valueOf(str).longValue();

7) float to String
String str = Float.toString(f);

8) String to float
float f = Float.valueOf(str).floatValue();

9) Long to Timestamp
long l = Long.valueOf(time).longValue();
Timestamp ts = new Timestamp(l);

10) String to Boolean
Boolean bool = Boolean.parseBoolean("true");