英文:
I need help comparing arrays with error checking in Java
问题
我查看了这里以前的一些类似问题，但似乎没有什么我尝试过可以修复我的程序。我正在进行一个用于学习Java的项目，我在这个特定部分遇到了问题。
我需要比较两个字符数组，并进行错误检查，然后打印与第一个数组中的字符对应的枚举常量数组。我尝试过使用嵌套for循环、增强for循环，还尝试将其设置为哈希集。我需要帮助。
第一个字符数组来自用户输入的字符串：例如，用户输入"FFRL"，它被放入一个字符数组['F', 'F', 'R', 'L']。第二个字符数组来自分配的枚举值FORWARD('F')，RIGHT('R')，LEFT('L')，它是['F', 'R', 'L']。如果给出无效输入，如B，就抛出一个错误。指令建议使用continue和/或break。这是预期的测试结果：
- 输入：FFRL
- 输出：{FORWARD FORWARD RIGHT LEFT}
- 输入：FFB
- 输出：INVALID INSTRUCTION EXCEPTION
该程序已经有一些预定义的方法，但我还没有在程序的循环部分中得到太多使用。如果我没有清楚地呈现这个问题，请告诉我是否更愿意看到代码或实际指令的一部分。
英文:
I looked at a bunch of previously similar issues on here and nothing I tried seems to fix my program. I'm working on a project that is used for learning Java and I'm hung up on this one section.
I need to compare two char arrays, with error checking, and print an array of enum constants that corresponds to the chars in the first array. I've tried doing a nested for loop, enhanced for loop, tried setting it up as hashsets. I need help.
The first array of chars comes from a user input string: ex. user inputs "FFRL", it gets put into a char array ['F', 'F' ,'R' ,'L']. The second array of chars is from assigned enum values FORWARD('F'), RIGHT('R'), LEFT('L') ['F', 'R', 'L']. Throw an error if given invalid input, such as B. Instructions suggest continue and/or break. Here's the expected testing outcome:
- input: FFRL
- output: {FORWARD FORWARD RIGHT LEFT}
- input: FFB
- output: INVALID INSTRUCTION EXCEPTION
The program does have some predefined methods but I haven't gotten much use out of them yet for the loop part of the program. Let me know if you rather see code or part of the actual instructions if i didn't present this clearly.
答案1
得分: 0
以下是翻译好的内容：
如果我理解正确，这就是你所寻找的：
枚举类：
public enum Enum {
FORWARD('F'),
RIGHT('R'),
LEFT('L');
private Enum(char letter) {
this.letter = letter;
}
private char letter;
public char getLetter() {
return letter;
}
}
方法：
public static Enum[] method(char[] input) throws InstructionException {
Enum[] output = new Enum[input.length];
for (int i = 0; i < input.length; i++) {
boolean found = false;
for (Enum e : Enum.values()) {
if (e.getLetter() == input[i]) {
output[i] = e;
found = true;
break;
}
}
if (!found) {
throw new InstructionException();
}
}
return output;
}
主函数：
public static void main(String[] args) {
char[] input = {'F', 'F', 'R'};
try {
Enum[] output = method(input);
for (Enum e : output) {
System.out.println(e);
}
} catch (InstructionException e) {
System.out.println("ERROR !");
}
}
英文:
If i understood correctly, this is what you're looking for :
Enum Class :
public enum Enum {
FORWARD('F'),
RIGHT('R'),
LEFT('L');
private Enum(char letter) {
this.letter = letter;
}
private char letter;
public char getLetter() {
return letter;
}
}
Method :
public static Enum[] method(char[] input) throws InstructionException {
Enum[] output = new Enum[input.length];
for (int i = 0; i < input.length; i++) {
boolean found = false;
for (Enum e : Enum.values()) {
if (e.getLetter() == input[i]) {
output[i] = e;
found = true;
break;
}
}
if (!found) {
throw new InstructionException();
}
}
return output;
}
Main :
public static void main(String[] args) {
char[] input = {'F', 'F', 'R'};
try {
Enum[] output = method(input);
for (Enum e : output) {
System.out.println(e);
}
} catch (InstructionException e) {
System.out.println("ERROR !");
}
}
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