averageLength获取用户在上一个案例中输入的所有单词并获取平均单词数。switch 语句位于 main 方法下（此处未显示），但是当我尝试实现案例 3 以获得平均值时，它不起作用，因为它没有average在main方法下声明，而是在averageLength. 我怎样才能解决这个问题？谢谢 import java.util.Scanner; import java.util.Arrays; /** * Word Manager * * @author Harry */ public class WordManager { /** * Adds the word to the next empty space in the array, if there is space. * Returns the new size of the array. */ public static int add(String[] words, int count, String word) { if (count < words.length) { words[count] = word; count++; } else { System.out.println("The array is full"); } return count; } /** Displays the words in the collection as a comma separated list. */ public static void printList(String[] words, int count) { } public static void averageLength(String[] words, int count) { Scanner sc = new Scanner(System.in); double average; double sum; while (sc.hasNext()) { String userInput = sc.next(); double charNum = userInput.length(); sum = charNum + sum; count++; if (count > 0) { average = sum / count; System.out.println("Average word length = " + average); } } } public static void main(String[] args ) { Scanner sc = new Scanner(System.in); String[] words = new String[20]; int count = 0; String aWord; int choice; do { System.out.println("\t MENU:"); System.out.println("1. Add a word"); System.out.println("2. Display words:"); System.out.println("3. Display average word length"); System.out.println("4. Quit"); System.out.println("Enter option: "); choice = sc.nextInt(); System.out.println("choice = "+choice);
4 回答
慕码人2483693
TA贡献1860条经验 获得超9个赞
您粘贴的代码存在一些问题 - 其中一些问题已在之前的评论/答案中确定，但为了完整性，我也会在此处列出它们：
名称中的拼写错误
averageLenth- 更改为averageLength。因此，您的代码将无法编译。averageLength(String[] words, int count)呼叫站点未遵守 的签名- 更改averageLength(words, count)为交换机内的呼叫站点。的实现
averageLength是不正确的 - 您的实现实际上并不是迭代单词数组并计算平均值，而是似乎要求扫描仪提供下一个输入。我更改了下面代码中的实现，以通过迭代单词数组来计算平均值。
import java.util.Scanner;
import java.util.Arrays;
/**
* Word Manager
*
* @author Harry
*/
public class WordManager {
/**
* Adds the word to the next empty space in the array, if there is space.
* Returns the new size of the array.
*/
public static int add(String[] words, int count, String word) {
if (count < words.length) {
words[count] = word;
count++;
} else {
System.out.println("The array is full");
}
return count;
}
/**
* Displays the words in the collection as a comma separated list.
*/
public static void printList(String[] words, int count) {
}
private static void averageLength(String[] words, int count) {
int sum=0;
for(int word =0; word < count; word++){
int wordLength = words[word].length();
sum += wordLength;
}
double averageWorldLength = sum/count;
System.out.println("Average word length = " +averageWorldLength;
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String[] words = new String[20];
int count = 0;
String aWord;
int choice;
do {
displayMenuOptions();
choice = sc.nextInt();
System.out.println("choice = " + choice);
switch (choice) {
case 1:
System.out.println("Add a word");
aWord = sc.next();
count = add(words, count, aWord);
break;
case 2:
System.out.println("Display words");
System.out.println("We have an array of " + words.length + " integers: " + Arrays.toString(words));
break;
case 3:
averageLength(words, count);
break;
default:
System.out.println("Invalid responce");
}
} while (choice >= 0 && choice < 4);
}
private static void displayMenuOptions() {
System.out.println("\t MENU:");
System.out.println("1. Add a word");
System.out.println("2. Display words:");
System.out.println("3. Display average word length");
System.out.println("4. Quit");
System.out.println("Enter option: ");
}
}
慕姐4208626
TA贡献1852条经验 获得超7个赞
import java.util.Scanner;
import java.util.Arrays;
/**
* Word Manager
*
* @author Harry
*/
public class WrodManager {
/**
* Adds the word to the next empty space in the array, if there is space.
* Returns the new size of the array.
*/
public static int add(String[] words, int count, String word) {
if (count < words.length) {
words[count] = word;
count++;
} else {
System.out.println("The array is full");
}
return count;
}
/** Displays the words in the collection as a comma separated list. */
public static void printList(String[] words, int count) {
}
public static void averageLength(String[] words, int count) {
Scanner sc = new Scanner(System.in);
double average;
double sum = 0;
while (sc.hasNext()) {
String userInput = sc.next();
double charNum = userInput.length();
sum = charNum + sum;
count++;
if (count > 0) {
average = sum / count;
System.out.println("Average word length = " + average);
}
}
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String[] words = new String[20];
int count = 0;
String aWord;
int choice;
do {
System.out.println("\t MENU:");
System.out.println("1. Add a word");
System.out.println("2. Display words:");
System.out.println("3. Display average word length");
System.out.println("4. Quit");
System.out.println("Enter option: ");
choice = sc.nextInt();
System.out.println("choice = " + choice);
switch (choice) {
case 1:
System.out.println("Add a word");
aWord = sc.next();
count = add(words, count, aWord);
break;
case 2:
System.out.println("Display words");
System.out.println("We have an array of " + words.length + " integers: " + Arrays.toString(words));
break;
case 3:
averageLength(words, count);
break;
default:
System.out.println("Invalid responce");
}
} while (choice >= 0 && choice < 4);
}
}
至尊宝的传说
TA贡献1789条经验 获得超10个赞
从显示的代码中，您可以不带参数调用“averageLength()”，而它需要两个参数：单词数组及其计数。
该调用还包含一个拼写错误（缺少“g”）。
因此，编译器无法找到该函数，因为它引用了实际不存在的函数。
此外，在“averageLength()”的两个参数中，单词数组未使用，您可以重新扫描单词，而不是使用通过其他开关情况建立的列表。这很可能是一个逻辑错误。
明月笑刀无情
TA贡献1828条经验 获得超4个赞
请修复：
在方法中
main()：averageLenth();averageLength(words, count);在方法中
averageLength()：double sum;double sum = 0;
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