Java에서 toString() 메소드를 사용하여 숫자의 문자열 표현을 얻는 방법은 무엇입니까?

public String toString()

public class ToStringMethodTest {
   public static void main(String args[]) {
      int num1 = 50;
      Integer num2 = 75;
      float flt1 = 50.75f;
      Float flt2 = 80.55f;
      double dbl1 = 3256522.44d;
      Double dbl2 = new Double(565856585d);
<strong>      </strong>//converting numbers to string format by toString()<strong>
</strong>      String str_int1 = Integer.toString(num1);
      String str_int2 = num2.toString();
      String str_flt1 = Float.toString(flt1);
      String str_flt2 = flt2.toString();
      String str_dbl1 = Double.toString(dbl1);
      String str_dbl2 = dbl2.toString();
      System.out.println("int to string = " + str_int1);
      System.out.println("Integer to string = " + str_int2);
      System.out.println("float to string = " + str_flt1);
      System.out.println("Float to string = " + str_flt2);
      System.out.println("double to string = " + str_dbl1);
      System.out.println("Double to string = " + str_dbl2);
   }  
}

int to string = 50
Integer to string = 75
float to string = 50.75
Float to string = 80.55
double to string = 3256522.44
Double to string = 5.65856585E8