Question

我有一个赋值，我需要使用抽象类号来使用类Number中的方法打印出值。

以下是给出的代码，我只需要使用这些方法来打印PI值：

public class Pi extends Number {

    public static double PI = 3.14159265358979323846264338327950;

    private int intValue;        // PI rounded down to nearest int
    private long longValue;      // PI rounded up to nearest int
    private float floatValue;    // PI as type float
    private double doubleValue;  // PI as defined

/*
* TBI (To Be Implemented)
* The constructor assigns values to all of the instance 
* variables defined above. The values that are assigned
* to the instance variables are documented using comments
* when the instance variables are defined.
*/
public Pi() {

  // the expressions on the right side of each of the following 
  // assignment statements must use PI in them...
  intValue = ;
  longValue = ;
  floatValue = ;
  doubleValue = ;
}

/*
* TBI (To Be Implemented)
* Returns a String representation of this Pi object
* that is used as the output of this progam.
*/
public String toString() {
}

/*
* The following methods cannot be modified/deleted.
*/
public static void main(String[] argv) {
  System.out.println(new Pi());
}

public double getPi() { return doubleValue; }
}

/*
* the output of the program must look something like the following
*

byteValue(): 3
shortValue(): 3
intValue(): 3
longValue(): 4
floatValue(): 3.1415927
doubleValue(): 3.141592653589793

*
*/

我只是很难开始这个。我不希望任何人为你做这个程序，只是帮助我开始，以及如何实现构造函数和方法。

Answer 1

非抽象Pi类扩展了抽象Number类，它有4个抽象方法。因此，Pi类必须实现这4个抽象方法。此外，您必须在提供的To Be Implemented框架代码中实现标记为Pi的代码，并确保您的实现返回预期的输出。

使用抽象类号进行PI分配

1 个答案: