我刚刚做了一个java莫尔斯电码翻译器,但是当我把莫尔斯转换成英语时,它把每个符号转换成一个字母,所以当我把它翻译成....它给了我e e e e而不是h.所以我的问题是我怎么做,所以我可以翻译整个单词在莫尔斯电码和使用一个|来分隔单词。
这是我的代码
public class project1 {
public static void main ( String [] args ) {
char [] english = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0' };
String [] morse = { ".-" , "-..." , "-.-." , "-.." , "." , "..-." , "--." , "...." , ".." , ".---" , "-.-" , ".-.." , "--" , "-." , "---" , ".--." , "--.-" , ".-." , "..." , "-" , "..-" , "...-" , ".--" , "-..-" , "-.--" , "--.." , "|" };
String a = Input.getString ( "Please enter MC if you want to translate Morse Code into English, or Eng if you want to translate from English into Morse Code" );
if (a.equals("MC"))
{
String b = Input.getString ("Please enter a sentence in Morse Code. Separate each letter/digit with a single space and delimit multiple words with a | .");
String[] words = b.split("|");
for (String word: words )
{
String[] characters = word.split(" ");
for (String character: characters)
{
if (character.isEmpty()) { continue; }
for (int m = 0; m < morse.length; m++)
{
if (character.equals(morse[m]))
System.out.print(english[m]);
}
}
System.out.print(" ");
}
}
else if (a.equals("Eng"))
{
String c = Input.getString ( "Please enter a sentence in English, and separate each word with a blank space." );
c = c.toLowerCase ();
for ( int x = 0; x < english.length; x++ )
{
for ( int y = 0; y < c.length (); y++ )
{
if ( english [ x ] == c.charAt ( y ) )
System.out.print ( morse [ x ] + " " );
}
}
}
else
{
System.out.println ( "Invalid Input" );
}
}
}
您遇到的问题是您的String#split(...)
方法没有考虑到|
是正则表达式方面的特殊字符,并且没有像您期望的那样分割字符串。您需要转义这个字符,以便正常工作。所以修改这个:
String[] words = b.split("|");
:
String[] words = b.split("\|"); // escaping the pipe char
要调试并查看事情是否按预期工作,请使用调试器或在代码中添加println,如:
String[] words = b.split("\|");
// TODO: remove line below from finished program
System.out.println(java.util.Arrays.toString(words));
顺便说一句,如果这是我的程序,我会使用HashMap<String, String>
来帮助我将英语翻译成莫尔斯码,反之亦然。
关于我刚刚执行的进一步搜索,请查看:为什么字符串。分割需要转义管道分隔符吗?有关管道字符需要转义的背景信息
这是您改编的代码,可以正常工作…
import java.util.Scanner;
public class project1 {
public static void main ( String [] args ) {
char [] english = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0' };
String [] morse = { ".-" , "-..." , "-.-." , "-.." , "." , "..-." , "--." , "...." , ".." , ".---" , "-.-" , ".-.." , "--" , "-." , "---" , ".--." , "--.-" , ".-." , "..." , "-" , "..-" , "...-" , ".--" , "-..-" , "-.--" , "--.." , "|" };
Scanner scanner = new Scanner(System.in);
System.out.println("Please enter MC if you want to translate Morse Code into English, or Eng if you want to translate from English into Morse Code");
String a = scanner.nextLine();
if (a.equals("MC"))
{
System.out.println("Please enter a sentence in Morse Code. Separate each letter/digit with a single space and delimit multiple words with a | .");
String b = scanner.nextLine();
String[] words = b.split("|");
for (String word: words )
{
String[] characters = word.split(" ");
for (String character: characters)
{
if (character.isEmpty()) { continue; }
for (int m = 0; m < morse.length; m++)
{
if (character.equals(morse[m]))
System.out.print(english[m]);
}
}
System.out.print(" ");
}
}
else if (a.equals("Eng"))
{
System.out.println("Please enter a sentence in English, and separate each word with a blank space.");
String c = scanner.nextLine();
c = c.toLowerCase ();
for ( int x = 0; x < english.length; x++ )
{
for ( int y = 0; y < c.length (); y++ )
{
if ( english [ x ] == c.charAt ( y ) )
System.out.print ( morse [ x ] + " " );
}
}
}
else
{
System.out.println ( "Invalid Input" );
}
}
}