Question

我遇到了在Java中将字符数组转换为字符串的问题。我只想复制非空的字符。以此代码为例：

import java.util.*;
import java.lang.*;
import java.io.*;

class CharArrayToStringTest
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // works just fine - string has 5 characters and its length is 5
        char[] word = {'h', 'e', 'l', 'l', 'o'};
        String sWord = new String(word);
        System.out.println("Length of '" + sWord + "' is " + sWord.length());

        // string appears empty in console, yet its length is 5?
        char[] anotherWord = new char[5];
        String sAnotherWord = new String(anotherWord);
        System.out.println("Length of '" + sAnotherWord + "' is " + sAnotherWord.length());
        // isEmpty() even says the blank string is not empty
        System.out.println("'" + sAnotherWord + "'" + " is empty: " + sAnotherWord.isEmpty());
    }
}

控制台输出：

Length of 'hello' is 5
Length of '' is 5
'' is empty: false

如何从字符数组中创建字符串，其中字符串末尾的任何空白字符都被省略？

Answer 1

使用String.trim()尝试trimming String中的尾随空格。只是做： -

char[] anotherWord = new char[5];
String sAnotherWord = new String(anotherWord);
sAnotherWord = sAnotherWord.trim();

现在，空格将被移除。

修改1 ：正如spencer.sm在其回答中提到的那样，您的第二次打印语句错误，因为它打印sWord.length()而不是{ {1}}。

Answer 2

Java中不能有空char。所有字符必须是一个字符。如果要删除字符串末尾的空格，请使用字符串trim()方法。

此外，您的第二个打印声明应以sAnotherWord.length()而不是sWord.length()结尾。见下文：

System.out.println("Length of '" + sAnotherWord + "' is " + sAnotherWord.length());

将字符数组转换为没有空格的字符串

2 个答案: