該程序提取數字，我希望它一直循環直到用戶鍵入鍵“Q”/“q”。例如，當用戶按下“O”鍵時，程序應該打印他們輸入的數字的個位數字，對于用戶輸入的任何 3 位數字，依此類推。我已經創建了提取個位、十位和百位數字的方法，并將它們存儲到單獨類中的變量中，但是當我嘗試打印這些數字時，控制臺中沒有打印任何內容。import java.util.Scanner;class Methods { public Methods (int value) {}public int hundreds (int num) { int hund = (num /100)%10; return hund;}public int tens (int num) { int ten = (num / 10)%10; return ten;}public int ones (int num) { int one = num % 10; return one;}}public class DigitExtractor {public static void main(String[] args) throws java.io.IOException { char input = ' '; //initialize outside loop Scanner s = new Scanner(System.in); System.out.print("Input an integer"); int wholeNumber = s.nextInt(); Methods num = new Methods(wholeNumber); do { System.out.println("show (W)hole number."); System.out.println("show (O)nes place number."); System.out.println("show (T)ens place number."); System.out.println("show (H)undreds place number."); System.out.println("(Q)uit"); System.out.println("Enter your choice: "); input = s.next().trim().charAt(0); //using scanner only if (wholeNumber == 'W' || wholeNumber == 'w') { System.out.println("The whole number is: " + wholeNumber); } else if (wholeNumber == 'O' || wholeNumber == 'o') { System.out.println("The ones place digit is: " + num.ones(wholeNumber)); } else if (wholeNumber == 'T' || wholeNumber == 't') { System.out.println("The tens place digit is: " + num.tens(wholeNumber)); } else if (wholeNumber == 'H' || wholeNumber == 'H') { System.out.println("The hundreds place digit is: " + num.hundreds(wholeNumber)); } } while ((wholeNumber != 'q') && (wholeNumber != 'Q'));}}
1 回答
弒天下
TA貢獻1818條經驗 獲得超8個贊
您的代碼有一些問題需要解決才能使其正常工作：
班級
Method必須在班級之外DigitExtractor。您在循環中調用的方法屬于該類
Methods，因此您必須實例化的構造函數是Methods.您必須從變量中捕獲鍵盤輸入
input。額外：你需要用 try/catch 包圍你的代碼。
我對您的代碼進行了最少的更正，并且它適用于此版本：
import java.util.Scanner;
public class DigitExtractor {
public static void main(String[] args) throws java.io.IOException {
try (Scanner input = new Scanner(System.in)){
System.out.print("Input an integer");
int integer = input.nextInt();
Methods num = new Methods(integer);
char keyboard;
do {
System.out.println("show (W)hole number.");
System.out.println("show (O)nes place number.");
System.out.println("show (T)ens place number.");
System.out.println("show (H)undreds place number.");
System.out.println("(Q)uit");
System.out.println("Enter your choice: ");
keyboard = input.next().charAt(0);
if (keyboard == 'W' || keyboard == 'w') {
System.out.println("The whole number is: " + integer);
} else if (keyboard == 'O' || keyboard == 'o') {
System.out.println("The ones place digit is: " + num.ones(integer));
} else if (keyboard == 'T' || keyboard == 't') {
System.out.println("The tens place digit is: " + num.tens(integer));
} else if (keyboard == 'H' || keyboard == 'H') {
System.out.println("The hundreds place digit is: " + num.hundreds(integer));
}
} while ((keyboard != 'q') && (keyboard != 'Q'));
}
}
}
class Methods {
public Methods (int value) {}
public int hundreds (int num) {
return (num /100)%10;
}
public int tens (int num) {
return (num / 10)%10;
}
public int ones (int num) {
return num % 10;
}
}
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