程序应在用户确认后返回数据输入，并在用户确认后终止

Question

我想通过请求是/否输入，循环我的html" target="_blank">代码返回到输入分子和分母部分。我正在使用封装（学校项目），我不知道如何做。以下是说明：

编写具有以下规范的Java程序：

>

在分数类中定义两个私有属性：分子和分母。定义此类的构造函数。

为Fraction类定义setter（mutators）和getter（accessor）。

在Fraction类中还定义以下自定义方法：a.showFractionForm b.determineLowestTerm c.DeterminateCimaleEquivalent d.determineFractionType

分数类型如下：a.适当的分数-分子小于分母b.不适当的分数-分子大于分母，但商是实数（例如：3.45）c.整数-分子大于分母，但商没有小数部分

创建一个名为Math的主类。这个类应该包含main方法。

在main方法中实例化Fraction类的对象。

调用main方法中Fraction类的方法以显示示例输出中所示的需求：

这是示例输出：

    import java.util.Scanner;

public class Main 
{

    public static void main (String[]args) 
    {

    Scanner input = new Scanner (System.in);
    Fraction frac = new Fraction ();

    System.out.println ("Enter numerator: ");
        frac.setNum (input.nextInt ());
    System.out.println ("Enter denominator: ");
        frac.setDen (input.nextInt ());

    System.out.println ("***************OUTPUT***************");
    System.out.println ("NUMERATOR: " + frac.getNum ());
    System.out.println ("DENOMINATOR: " + frac.getDen ());
    System.out.println ("FRACTION FORM: " + frac.getShowFractionForm ());
    System.out.println ("LOWEST TERM: " + frac.getDetermineLowestTerm ());
    System.out.println ("LOWEST TERM: " + frac.getDetermineFractionType());
    System.out.println ("DECIMAL EQUIVALENT: " + frac.getDetermineDecimalEquivalent ());

} 

public static class Fraction 
{

private int num, den;
private String showFractionForm;
private String determineFractionType;
private String determineLowestTerm;
private double determineDecimalEquivalent;


//accessors


public String getShowFractionForm () 
{

String num1 = Integer.toString (num);
String den1 = Integer.toString (den);
showFractionForm = num + "/" + den;
return showFractionForm;
}

public String getDetermineFractionType()
{
if (num % den == 0) {
    determineFractionType = ("WHOLE NUMBER");
} else if (num < den ) {
    determineFractionType = ("PROPER FRACTION");
} else if (num > den) {
    determineFractionType = ("IMPROPER FRACTION");
}
return determineFractionType;
}

public String getDetermineLowestTerm () 
{
int smaller = num < den ? num : den;
int HCF = -1;
    for (int i = smaller; i > 0; --i){
        if (num % i == 0 && den % i == 0)
    {
HCF = i;
determineLowestTerm = (num / HCF) + "/" + (den / HCF);
break;
    }
}
return determineLowestTerm;
}

public double getDetermineDecimalEquivalent () 
{
determineDecimalEquivalent = (double) num / den;
return determineDecimalEquivalent;
}

public int getNum ()
{
return num;
}

public int getDen ()
{
return den;
}


//mutators

public void ShowFractionForm (String form) 
{
this.showFractionForm = form;
} 
public void setDetermineFractionType(String type)
{
    this.determineFractionType = type;
}
public void setDetermineLowestTerm (String term) 
{
this.determineLowestTerm = term;
} 

public void setDetermineDecimalEquivalent (int decimal) 
{
this.determineDecimalEquivalent = decimal;
} 

public void setNum (int num)
{
this.num = num;
} 

public void setDen (int den)
{
this.den = den;
} 

} 

}

Answer 1

只需从以下开始包装所有内容：

System.out.println ("Enter numerator: ");

在while循环中。如下所示：

public static void main(String[] args) {

    Scanner input = new Scanner (System.in);

    while(true) {
        System.out.println("Enter numerator: ");
        //enumerator code here
        System.out.println("Enter denominator: ");
        //denominator code here

        //some additional code here

        System.out.println("Again? ");
        if (input.nextLine().toLowerCase().equals("n")) break;
    }

}

Answer 2

我想这样的事情会对你有所帮助：

Scanner sc = new Scanner(System.in);        
    System.out.println("Again? y/n");
    String answer = sc.next(); 

    while (answer.equals("y")) {
        System.out.println("Looping job!");         

        System.out.println("Again? y/n");
        answer = sc.next(); 
        if(answer.equals("n")) {
            System.out.println("bye T.T");
            break;
        }           
    }

Answer 3

您可以这样尝试smth：

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    Fraction frac = new Fraction();
    boolean isContinue = true;
    while (isContinue) {
        System.out.println("Enter numerator: ");
        frac.setNum(input.nextInt());
        System.out.println("Enter denominator: ");
        frac.setDen(input.nextInt());

        System.out.println("***************OUTPUT***************");
        System.out.println("NUMERATOR: " + frac.getNum());
        System.out.println("DENOMINATOR: " + frac.getDen());
        System.out.println("FRACTION FORM: " + frac.getShowFractionForm());
        System.out.println("LOWEST TERM: " + frac.getDetermineLowestTerm());
        System.out.println("LOWEST TERM: " + frac.getDetermineFractionType());
        System.out.println("DECIMAL EQUIVALENT: " + frac.getDetermineDecimalEquivalent());
        System.out.println("Input again? [y/n]");
        String result = input.next();
        isContinue = result.equals("y");
    }
}

有关while循环的详细信息：https://www.w3schools.com/java/java_while_loop.asp