我如何檢查數組中的數據與indexOf在java

Question

我是相當新的Java和我試圖用indexOf來檢查一個人的名字是否以數組中的字母結尾並輸出一個字它押韻用。我哪裏錯了？例如院長以「ean」結尾，所以它用綠色押韻。謝謝你們

String [] first = new String [3]; 
    first [0] = "eem"; 
    first [1] = "een"; 
    first [2] = "ean"; 

    for (int i = 0; i < first.length; i++) { 

     if (first[i].indexOf(first.length) != -1){ 
      System.out.println("That rhymes with green"); 
     } 
    } 

Answer 1

您應該使用endsWith而不是indexOf。 indexOf將返回傳遞的字符串與當前字符串完全匹配的索引，顧名思義，endsWith將檢查當前字符串是否以傳入的字符串結尾。

看看下面的代碼：

String personName = "Dean"; 
String[] suffix = {"eem", "een", "ean"}; 
String[] names = {"greem", "green", "grean"}; 

for(int i = 0; i < suffix.length; i++) { 
    if (personName.endsWith(suffix[i])){ 
     System.out.println("That rhymes with " + names[i]); 
    } 
} 

此外，理想情況下，你會想保留地圖suffix -> name可維護性，但是爲了簡單/探索這應該是罰款。

Answer 2

要與氣象檢查輸入包含給定元素的任何數組，你應該得到input，然後遍歷您的陣列來看待。例如

String personname = "Dean"; 
    String [] first = new String [3]; 
    first [0] = "eem"; 
    first [1] = "een"; 
    first [2] = "ean"; 

    for (int i = 0; i < personname.length; i++) {  
     if (input.indexOf(first[i]) != -1){ // check my input matched 
      System.out.println("That rhymes with green"); 
     } 
    } 

Answer 3

我已經在編譯器上測試並運行了它。這工作正常。請評論任何問題。由於

import java.util.*; 

public class HelloWorld 
{ 

    public static void main(String []args) 
     { 
      String [] first = new String [3]; 
      first [0] = "eem"; 
      first [1] = "een"; 
      first [2] = "ean"; 

      /* I am trying to get the input from user here */ 

      String s; 
      Scanner in = new Scanner(System.in); 
      System.out.println("Enter the string:"); 
      s = in.nextLine(); 

      /* Now, String.indexOf(substring) will check the condition if the match happens it will print the output, if it doesn't it returns -1 */ 

      for (int i = 0; i <s.length(); i++) 
       {  
        if (s.indexOf(first[i]) != -1) 
         { 
          System.out.println("That rhymes with green"); 
         } 
       } 

     } 
}