我正在尝试创建一个Java程序,将莫尔斯码转换为英文。在这种情况下,字母用一个空格分开,以字由三个空格隔开。英文摩尔斯码:ArrayIndexOutOfBoundsException
import java.util.Scanner;
public class ReverseMorseCodeProgram {
public static void main(String[] args) { //Converts Morse Code into English
System.out.println("Enter the Morse Code to be converted to English (letters and spaces only, no numbers or punctuation):");
String sentence = new Scanner(System.in).nextLine(); //Input is converted into String
char[] dotdash = sentence.toCharArray(); //String is converted into char[]
String[] words = new String[30]; //String array where char[] is converted into morse code letters
int y = 0;
int x = 0;
while (dotdash[x] < dotdash.length) { //Converts char[] into String[]
while (dotdash[x] != ' ') { //loops until a space is encountered
words[y] = words[y] + dotdash[x]; //adds chars to String in array
x = x + 1; //goes to next char in array
}
if ((dotdash[x+1] == ' ') && (dotdash[x+2] == ' ')) { //determines whether there are three spaces in a row
words[y+1] = " "; //adds " " as next string in array
y = y + 2; //moves to string after " "
x = x + 3; //moves to char after the three spaces
}
else { //if there's only one space
y = y + 1; //moves to next string in String[]
x = x + 1; //moves to next char in char[]
}
}
char[] alphabet = {'a', 'b', 'c', 'd', //English alphabet array
'e', 'f', 'g', 'h',
'i', 'j', 'k', 'l',
'm', 'n', 'o', 'p',
'q', 'r', 's', 't',
'u', 'v', 'w', 'x',
'y', 'z', ' '};
String[] morse = {".-", "-...", "-.-.", "-..", //morse code alphabet array
".", "..-.", "--.", "....",
"..", ".---", "-.-", ".-..",
"--", "-.", "---", ".--.",
"--.-", ".-.", "...", "-",
"..-", "...-", ".--", "-..-",
"-.--", "--..", " "};
for (int i = 0; i < words.length; i++) { //repeats until end of String array
for (int t = 0; t < 27; t++) { //goes through morse code array
if (morse[t] == words[i]) { //compares morse code to each word in String array
System.out.print(alphabet[t]); //prints equivalent english letter when match is found
}
}
}
}
}
然而,当我输入短语“ - -.-- ..- .- ...- - - ..- .- .-。-.-。--- .- .. --- .-。.. .-。 - ..“,我收到以下错误:
java.lang.ArrayIndexOutOfBoundsException: 78
at ReverseMorseCodeProgram.main(ReverseMorseCodeProgram.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)
输入一个较短的字符串,如“ - ”根本没有输出。
我是相当新的编程,这让我难住。
编辑:我已经从改变违规的部分:
while (dotdash[x] < dotdash.length) { //Converts char[] into String[]
while (dotdash[x] != ' ') { //loops until a space is encountered
words[y] = words[y] + dotdash[x]; //adds chars to String in array
x = x + 1; //goes to next char in array
}
if ((dotdash[x+1] == ' ') && (dotdash[x+2] == ' ')) { //determines whether there are three spaces in a row
words[y+1] = " "; //adds " " as next string in array
y = y + 2; //moves to string after " "
x = x + 3; //moves to char after the three spaces
}
else { //if there's only one space
y = y + 1; //moves to next string in String[]
x = x + 1; //moves to next char in char[]
}
}
以下几点:
while (x < dotdash.length) { //Converts char[] into String[]
while (dotdash[x] != ' ') { //loops until a space is encountered
words[y] = words[y] + dotdash[x]; //adds chars to String in array
x = x + 1; //goes to next char in array
}
if (((x+2) < dotdash.length) && ((y+1) < words.length)) { //ensures that dotdash[x+2] and (y+1) doesn't exceed their respective boundaries
if ((dotdash[x+1] == ' ') && (dotdash[x+2] == ' ')) { //determines whether there are three spaces in a row
words[y+1] = " "; //adds " " as next string in array
y = y + 2; //moves to next string after " "
x = x + 3; //moves to next char after the three spaces
}
else { //if there's only one space
y = y + 1; //moves to next string in String[]
x = x + 1; //moves to next char in char[]
}
}
}
然而,ArrayIndexOutOfBoundsException异常错误仍然存在。我似乎无法找到我能超越阵列边界的地方。
我已经做了一些改变(添加到我的文章的编辑),但错误似乎是持续存在... –
ArrayIndexOutOfBoundsException会告诉您发生异常的线路,因此请检查该线路上的代码,以查看超出数组末尾的引用方式。我猜它会在第一个内部while循环中的某处,在那里你不检查任何长度。 – blm