Java String[] 无法转换为 String
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String[] cannot be converted to String
提问by Kapaz
So I'm writing a program where i ask the user to enter size of array and fill it with names. Later i ask user to type number and the program will search array for names that have length. However i keep getting a incompatible type error. String[] cannot be converted to string.
所以我正在编写一个程序，我要求用户输入数组的大小并用名称填充它。后来我要求用户输入数字，程序将在数组中搜索具有长度的名称。但是我不断收到不兼容的类型错误。String[] 不能转换为字符串。
package LAB4_1;
import java.util.Arrays;
import java.util.Scanner;
public class LAB4_1
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
String names [];
int length_typed;
String names_printed;
// Read the number of kids
System.out.print("How many kids are there? ");
int size = sc.nextInt();
// Read the names of the kids
String [] kids = new String [size];
for (int k = 0; k < kids.length; k++)
{
System.out.print("Enter name of kid #" + k + ": ");
kids[k] = sc.next();
}
// Print all the names of the kids and the length of their names
System.out.println("Names of kids with lengths are: ");
for (int i = 0; i < kids.length; i++)
{
System.out.println(kids[i] + " " + kids[i].length());
}
// Prompt for sequence of name lengths:
System.out.print("Enter lengths of names as promted, 0 to terminate.");
// Read the lengths and print list of names till 0 is entered
length_typed = sc.nextInt();
The error is here
错误在这里
names_printed = LAB4_1.filterByLength(names, length_typed);
String[] cannot be converted to String. Am i not calling the method correctly?
String[] 不能转换为 String。我没有正确调用该方法吗？
System.out.println(names_printed);
}
/**
* Count the number of names in an array that have a certain length
* @param names: An array of names
* @param length : an integer length
* @return the number of names in the array whose length is given
*/
static int countByLength(String [] names, int length)
{
int count = 0;
for(int i = 0;i < names.length;i++)
{
if(names[i].length() == length)
count++;
}
return count;
}
/**
* Filter an array of names and keep only those names with a given length
* @param names: an array of names
* @param length: an integer length
* @return the array of names that have the given length
*/
static String [] filterByLength(String [] names, int length)
{
String [] filtered = new String[countByLength(names, length)];
int index = 0;
for(int k = 0; k < filtered.length; k++)
{
if(names[k].length() == length) filtered[index++]=names[k];
}
return filtered;
}
}
}
采纳答案by k_g
No you are not calling the method correctly. Your method filterByLengthreturns the type String[]. You are trying to place the value in a Stringobject, namely names_printed.
不，您没有正确调用该方法。您的方法filterByLength返回类型String[]。您正在尝试将该值放在一个String对象中，即names_printed.
That doesn't work. Retype your names_printedas a String[]and your code should work. However, you won't be able to use printlnand get a readable output. You should use println(Arrays.toString(names_printed)).
那行不通。重新键入您names_printed作为 aString[]和您的代码应该工作。但是，您将无法使用println并获得可读的输出。你应该使用println(Arrays.toString(names_printed)).
