Hui Li 李辉 我的电脑小天地

String -> double:

Double d = Double.valueOf(String s);
Double d = Double.parseDouble(String s);

String -> int:

int i = Integer.parseInt(String s);

int & double -> String:

String s = ""+i;
String s = ""+d;

int -> double:

double d = (double)i;

double -> int:

int i = (int)d;