double d = double . parse double(" 1.0 ")；

String-> flotage

float f = float . parse float(" 1.0f ")；

String-> Internationalorganizations (same as international organizations)

int I = integer . parse integer(" 123 ")；

Hehe, and long is also used in this way, but remember that string must be a numeric string when converting values. . . If it contains other characters, a type conversion exception is reported. .