String? -& gt； ? Internationalorganizations (same as international organizations)

s = " 12345 "；

int？ Me;

The first method: I = integer.parseint (s);

The second method: i=Integer.valueOf(s). int value()； The first method: I = integer.parseint (s); //Using the static method directly will not generate redundant objects, but will throw an exception.

The second method: i=Integer.valueOf(s). int value()； //Integer.valueOf(s) is equivalent to new Integer(Integer.parseInt(s)), and an exception will be thrown, but an extra object will be generated.