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[英]why does my program print the numbers in my array as zeros but still print the largest value out of the array?
[英]Why does setting a value to a specific subscript of an array not print it out?
在下面的代碼中,在底部,出於某種原因,雖然我分配了 encodingCharacter = encodeArray[j]; 的值。 之后,我嘗試打印出該特定下標值。 但出於某種原因,該聲明引起了問題。 在我運行程序后,我看到它運行了 2 個空行,我不知道為什么我不能將字符值 'z' 分配給 encodingCharacter。
import java.util.Scanner;
public class UserInputDemo1
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
//creating scanner named input.
System.out.println ("Would you like to encode or decode a message.");
System.out.println ("If you would like to encode a message enter true. If you would like to decode a message enter false");
System.out.println("Note that blank spaces are seperated by a space and the message terminates with a period.");
boolean encodeOrDecode = input.nextBoolean();
if (encodeOrDecode)
{
Scanner scan = new Scanner(System.in);
System.out.println("Please enter the message you would like to be encoded.");
String encodeMessage = scan.nextLine();
char[] encodeCharArray = encodeMessage.toCharArray();
encodeMessage(encodeCharArray);
}
if (!encodeOrDecode)
{
Scanner scan = new Scanner(System.in);
System.out.println("Please enter the message you would like to be decoded.");
String decodeMessage = scan.nextLine();
char[] decodeCharArray = decodeMessage.toCharArray();
}
}
public static void encodeMessage (char encoding [])
{
char encodeArray [] = new char [encoding.length];
for (int j = 0; j < encoding.length; j++ )
{
char encodingCharacter = encoding[j];
if (encodingCharacter == 'a')
{
encodingCharacter = 'z';
System.out.println(encodingCharacter);
encodingCharacter = encodeArray[j];
System.out.println(encodeArray[j]);
}
if (encodingCharacter == 'b')
{
encodingCharacter = 'y';
System.out.println(encodingCharacter);
encodingCharacter = encodeArray[j];
}
}
String encodedArray = new String(encodeArray);
System.out.println (encodeArray);
}
}
第15行是 java.util.InputMismatchException 發生的地方。
您的input.nextBoolean()
返回輸入的下一個標記是否是布爾值,而不是是否有另一個字符。
我相信您正在尋找input.hasNext()
或 類似的東西。
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