String转换char数组和int型和Double型

package z;

public class z {

public static void main(String[] args) {

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

int s_ = Integer.parseInt(s);// String转换为int
System.out.println(s_);

double s__ =Double.parseDouble(s);// String转换为double
System.out.println(s__ );

}

}