为什么在用空白空间替换元音后没有改变句子？

Question

这里是我的代码，我用空白空间代替元音：

System.out.println("Enter a sentence"); 
String sentence=in.nextLine(); 
for(int i=0;i<sentence.length();i++) { 
    if(sentence.charAt(i)=='a'||sentence.charAt(i)=='e'|| sentence.charAt(i)=='i'|| 
     sentence.charAt(i)=='o'|| sentence.charAt(i)=='u') 
    { 
     sentence.replace(sentence.charAt(i), ' '); 
    } 
} 
System.out.println(sentence); 

Answer 1

你有replace()

public static void main(String[] args) throws Exception { 
    Scanner in = new Scanner(System.in); 

    System.out.println("Enter a sentence"); 
    String sentence = in.nextLine(); 
    for (int i = 0; i < sentence.length(); i++) { 
     if (sentence.charAt(i) == 'a' || sentence.charAt(i) == 'e' || sentence.charAt(i) == 'i' 
       || sentence.charAt(i) == 'o' || sentence.charAt(i) == 'u') { 
      // Assign the results of replace() back to sentence 
      sentence = sentence.replace(sentence.charAt(i), ' '); 
     } 
    } 
    System.out.println(sentence); 
} 

您能抽出自己for环和长篇大论if与replaceAll()后重新分配句子使用图案

"[aAeEiIoOuU]"

个

public static void main(String[] args) throws Exception { 
    Scanner in = new Scanner(System.in); 

    System.out.println("Enter a sentence"); 
    String sentence = in.nextLine(); 

    // Replace all english upper-case & lower-case vowels 
    System.out.println(sentence.replaceAll("[aAeEiIoOuU]", " ")); 
} 

结果：

Enter a sentence 
thE Quick Brown FOX 
th Q ck Br wn F X