如何將指定的字符串值與整數值相關聯？

我正在編寫一個代碼，允許用戶決定他們想要什麼類型的投資（年度，月度或季度），並且每種投資類型都與特定的整數相關聯：即Annual = 1，Monthly = 12和Quarterly = 4 。但是，當我每年分配一個值時，我也需要將它與下面我的投資等式中的整數值相關聯，並且完全不知道如何去做。如何將指定的字符串值與整數值相關聯？

import java.util.Scanner; 
import java.lang.Math; 
public class CompoundInterest { 

    public static void main (String [] args) 
      { 
       Scanner cool = new Scanner (System.in); 
    double saving, rate; 
    int principal, years; 
    int choice; 

    System.out.println("Please enter you principal investment:"); 
    /*Print statment prompts user to enter their principal investment*/ 
    principal = cool.nextInt(); 

    System.out.println("Would you like to have a regular investment plan?"); 
    /* Print out statement asks user if they would like to participate in a regular investment plan*/ 
    String question =cool.next(); 

    System.out.println("What type of investment plan would you prefer (Annual, Quarterly, or Monthly)?"); 
    String quest =cool.next(); 

    while (quest.equalsIgnoreCase(("Annual"))) 
    { String Annual="1"; 
     Annual.equals(choice); 

    } 

    System.out.println("Please enter the number of years that you wish to invest for:"); 
    /* Print statement prompts user to enter the number of years that they wish to invest for*/ 
    years = cool.nextInt(); 

    System.out.println("Please enter the return rate per year:"); 
    /* Print statement prompts user to enter the return rate per year*/ 
    rate = cool.nextDouble(); 

    saving = principal*(1+(rate/choice))* Math.pow(choice, years); 
    System.out.printf("%.2f", saving); 
    }

來源

2017-10-15 Huntress

您可以創建一個數組「invesment」，位置年度，月度和季度使invesment [的Integer.parseInt （Annual）] = your_correlated_value; – Jar3d

一旦投資計劃的類型回答，您需要檢查quest變量匹配任何您所期待的字符串，即Annual，Quarterly，或Monthly的。
如果quest匹配任何的選擇，你指定一個正確的值choice變量，即，1，4，或12

你也可能還需要如果答案沒有想到的情況下，匹配任何正確的選擇。

if ("Annual".equalsIgnoreCase(quest)) { 
    choice = 1; 
} else if ("Quarterly".equalsIgnoreCase(quest)) { 
    choice = 4; 
} else if ("Monthly".equalsIgnoreCase(quest)) { 
    choice = 12; 
} else { 
    //you need to do something here. 
}

來源

2017-10-15 03:09:23

我會建議使用定義的詮釋你想要一個枚舉。我會打電話給枚舉計劃和INT項：

public enum Plan { 
    ANNUAL(1), 
    QUARTERLY(4), 
    MONTHLY(12); 

    int term; 

    Plan(int term) { 
     this.term = term; 
    } 
};

你會在你的代碼像這樣使用（它取代INT選擇）：

Plan plan = Plan.valueOf(quest.toUpperCase()); 
    saving = principal * (1 + (rate/plan.term)) * Math.pow(plan.term, years);

我想你會需要不同您的計算版本。如果你在enum中添加了一個方法來打開enum的值，enum方法將很容易支持。您可以計算出不同的計算實現並在case語句中定義它們。

double calculateSavings(int principal, double rate, int years) { 
     switch (this) { 
      case ANNUAL: 
      case QUARTERLY: 
      case MONTHLY: 
      default: 
       return principal * (1 + (rate/term)) * Math.pow(term, years); 
     } 
    }

如果你走這條路線，你會用它在你的代碼是這樣的：

// saving = principal * (1 + (rate/plan.term)) * Math.pow(plan.term, years); 
    saving = plan.calculateSavings(principal, rate,years);

來源

2017-10-15 03:33:24 Jeff

如何將指定的字符串值與整數值相關聯？

回答

相關問題