Java 字符串[]无法转换为字符串
所以我正在编写一个程序,要求用户输入数组的大小并用名称填充。稍后,我要求用户键入数字,程序将在数组中搜索具有长度的名称。但是,我不断得到一个不兼容的类型错误。字符串[]无法转换为字符串Java 字符串[]无法转换为字符串,java,compiler-errors,static-methods,Java,Compiler Errors,Static Methods,所以我正在编写一个程序,要求用户输入数组的大小并用名称填充。稍后,我要求用户键入数字,程序将在数组中搜索具有长度的名称。但是,我不断得到一个不兼容的类型错误。字符串[]无法转换为字符串 package LAB4_1; import java.util.Arrays; import java.util.Scanner; public class LAB4_1 { public static void main(String[] args) { Scanner sc = new Sc
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();
字符串[]无法转换为字符串。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;
}
System.out.println(打印的名称);
}
/**
*计算数组中具有特定长度的名称数
*@param names:名称数组
*@param length:一个整数长度
*@返回数组中给定长度的名称数
*/
静态int countByLength(字符串[]名称,int长度)
{
整数计数=0;
for(int i=0;i
}否您没有正确调用该方法。您的方法
filterByLength
返回类型字符串[]
。您正试图将该值放入字符串
对象中,即名称\u打印
那不行。将打印的
名称重新键入为字符串[]
,您的代码应该可以工作。但是,您将无法使用println
并获得可读的输出。您应该使用println(Arrays.toString(names_printed))
尝试将字符串数组分配给字符串变量。我认为错误消息是完全清楚的,您将String[]
从filterByLength
方法返回给String
变量
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;
}