Java程序來簡化分數不起作用。

我正在嘗試編寫一個程序，它將從用戶（形式爲a/b）中取出兩個部分，並通過特定的操作並簡化結果。我已經能夠得到正確的數學，但我沒有簡化部分的運氣。我每次運行程序時都會遇到ArithmeticExceptions。Java程序來簡化分數不起作用。

任何人都可以指向正確的方向，並提供我的代碼反饋？

任何建議，歡迎和讚賞！

主類：

import java.util.*; 
    public class Fraction { 

     /** 
     * @param args 
     */ 
     @SuppressWarnings("resource") 
     public static void main(String[] args) { 

      Scanner input = new Scanner(System.in); 
      System.out.println("Please enter your first fraction:"); 
      String frac = input.nextLine(); 
      Driver f1 = new Driver(frac); 

      System.out.println("Please enter your second fraction:"); 
      String frac2 = input.nextLine(); 
      Driver f2 = new Driver(frac2); 

      Driver multiFrac = f1.multiply(f1, f2); 
      System.out.println("Multiplication: " +multiFrac.getNum()+ "/" + multiFrac.getDenom()); 

      Driver divFrac = f1.divide(f1, f2); 
      System.out.println("Division: " + divFrac.getNum()+ "/" + divFrac.getDenom()); 

      Driver addFrac = f1.add(f1, f2); 
      System.out.println("Addition: " + addFrac.getNum()+ "/" + addFrac.getDenom()); 


      Driver subFrac = f1.sub(f1, f2); 
      System.out.println("Subtraction: " + subFrac.getNum()+ "/" + subFrac.getDenom()); 


     } 


    }

構造類：

public class Driver { 

     public static int num0; 
     public static int denom0; 
     private int denom = 0; 
     private int num = 0; 

     public Driver (String frac){ 

    String s0[] = frac.split("/"); 

    int[] numbers0 = new int[s0.length]; 
    for(int i = 0;i < s0.length;i++){ 

     numbers0[i] = Integer.parseInt(s0[i]); 
    } 

    num = numbers0[0]; 
    denom = numbers0[1]; 
} 

public Driver(int num0, int denom0) { 
    num = num0; 
    denom = denom0; 
} 

public int getNum(){ 
    int gcf= GCD(num0, denom0); 
    return (num/gcf); 
} 

public int getDenom(){ 
    int gcf = GCD(num0, denom0); 
    return (denom/gcf); 
} 


public Driver add(Driver firstFrac, Driver secondFrac){ 
    int denom0 = firstFrac.getDenom() * secondFrac.getDenom(); 
    int num0 = firstFrac.getNum() * secondFrac.getDenom() + secondFrac.getNum() * firstFrac.getDenom(); 
    this.GCD(num0, denom0); 
    return new Driver (num0 , denom0); 
} 

public Driver sub(Driver firstFrac, Driver secondFrac){ 
    int denom0 = firstFrac.getDenom() * secondFrac.getDenom(); 
    int num0 = (firstFrac.getNum() * secondFrac.getDenom()) - (secondFrac.getNum() * firstFrac.getDenom()); 
    return new Driver (num0 , denom0); 
} 

public Driver multiply(Driver firstFrac, Driver secondFrac){ 
    int num0 = firstFrac.getNum() * secondFrac.getNum(); 
    int denom0 = firstFrac.getDenom() * secondFrac.getDenom(); 
    return new Driver (num0, denom0); 
} 

public Driver divide(Driver firstFrac, Driver secondFrac){ 
    int num0 = firstFrac.getNum() * secondFrac.getDenom(); 
    int denom0 = firstFrac.getDenom() * secondFrac.getNum(); 
    this.GCD(num0, denom0); 
    return new Driver (num0, denom0); 
} 

public int GCD(int a, int b){ 
     if (b==0) return a; 
     return GCD(b,a%b); 
} 
}

來源

2015-09-11 ZachP.

這裏是一個暗示，使用BigDecimal的

String str[] = frac.split("/"); 

BigDecimal top = new BigDecimal (str[0]); 
BigDecimal bottom= new BigDecimal (str[1]); 

BigDeimal result = top.divide (bottom);

看到http://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#divide(java.math.BigDecimal)

來源

2015-09-11 01:41:22

'BigDecimal'是不是有助於分數。 'new BigDecimal（1）.divide（new BigDecimal（3））;'拋出一個異常。 –

是的，閱讀javadocs，並考慮使用舍入模式。我將試圖向OP說明，要求標準的Java類不是一個好主意。 –

Java程序來簡化分數不起作用。

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