Java 如何实现；凌驾；在爪哇？

我试图在java中使用多态性对二进制到十进制和十进制到二进制进行编码，但是它一直打印位于父类中的方法，而不是重写。谢谢你的帮助

oopfailal.class:

package oopfinal;
import java.util.Scanner;

public class OopFinal extends Convert{

    public static void main(String[] args) {

      Scanner userInput = new Scanner(System.in);

      System.out.print("Please value to convert: ");
      int inputNumbers = userInput.nextInt();

      Convert convert = new Convert();

      //checks whether number is binary or not  

      if (inputNumbers !=0 || inputNumbers % 10 > 1){
           String bin = Integer.toBinaryString(inputNumbers);
           int binaryResult = Integer.parseInt(bin);
           convert.Calc(binaryResult);

      } else if (inputNumbers == 0 || inputNumbers % 10 == 1) {
           String dec = Integer.toString(inputNumbers);
           int decimalResult = Integer.parseInt(dec);
           convert.Calc(decimalResult);  

      } else {
           System.out.println("Negative numbers are invalid here... ");
      }    
     }


     //binary to decimal
     @Override
     public void Calc(int n) {
         System.out.println("Decimal equivalent is: " + n);
     }    
 }

package oopfinal;

public class Convert {

    //decimal to binary
    public void Calc(int n) {
        System.out.println("Binary equivalent is: " + n);
   }
}

转换器。类别：

package oopfinal;
import java.util.Scanner;

public class OopFinal extends Convert{

    public static void main(String[] args) {

      Scanner userInput = new Scanner(System.in);

      System.out.print("Please value to convert: ");
      int inputNumbers = userInput.nextInt();

      Convert convert = new Convert();

      //checks whether number is binary or not  

      if (inputNumbers !=0 || inputNumbers % 10 > 1){
           String bin = Integer.toBinaryString(inputNumbers);
           int binaryResult = Integer.parseInt(bin);
           convert.Calc(binaryResult);

      } else if (inputNumbers == 0 || inputNumbers % 10 == 1) {
           String dec = Integer.toString(inputNumbers);
           int decimalResult = Integer.parseInt(dec);
           convert.Calc(decimalResult);  

      } else {
           System.out.println("Negative numbers are invalid here... ");
      }    
     }


     //binary to decimal
     @Override
     public void Calc(int n) {
         System.out.println("Decimal equivalent is: " + n);
     }    
 }

package oopfinal;

public class Convert {

    //decimal to binary
    public void Calc(int n) {
        System.out.println("Binary equivalent is: " + n);
   }
}

---

对于方法重写，签名（返回类型除外）必须不同。这不符合使用方法重写实现的条件。这是否回答了您的问题？多态性的使用存在问题，因为您的convert实例不是oopfail，因为您正在编写：

convert convert=new convert（）。相反，您应该编写
Convert=new oopfail（）
。这就是如何使对Calc方法的调用动态绑定到子方法而不是父方法的方法。