字符串[]不能转换为字符串

所以我正在写一个程序，我要求用户输入数组的大小并填写名称。之后，我要求用户键入数字，程序将搜索数组中有长度的名称。但是我不断收到一个不兼容的类型错误。字符串[]不能转换为字符串。字符串[]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();

该错误是这里

 names_printed = LAB4_1.filterByLength(names, length_typed);

字符串[]不能被转换成字符串。我是不是正确调用方法？

 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; 
}

}

来源

2015-02-09 Kapaz

您正在尝试将字符串数组分配给字符串变量。 – Zavior 2015-02-09 06:32:01

我认为错误信息是完全清楚的，您将'filter [']'从'filterByLength'方法返回给'String'变量 – 2015-02-09 06:33:51

不，你没有正确调用方法。您的方法filterByLength返回类型String[]。您正尝试将该值放在String对象中，即names_printed。

这是行不通的。请重新输入names_printed作为String[]，并且您的代码应该可以正常工作。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))。

来源

2015-02-09 06:33:06

字符串[]不能转换为字符串

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