package z;

public class z {

public static void main(String[] args) {

String s = "123";
char[] c = s.toCharArray();// String轉換為char[]
for (int i = 0; i < c.length; i++) {
System.out.println(c[i]);
}

int s_ = Integer.parseInt(s);// String轉換為int
System.out.println(s_);

double s__ =Double.parseDouble(s);// String轉換為double
System.out.println(s__ );

}

}

String轉換char數組和int型和Double型