如何搜索一個關鍵字的字符串，然後在java中打印關鍵字後面的內容？

Question

我想搜索特定單詞的字符串，然後打印該單詞之後的下5個字符。我不知道如何去做這件事。我試圖尋找教程，但找不到任何東西。

Answer 1

您可以在String上使用indexOf方法，然後爲後面的字符執行substring。

int start = yourString.indexOf(searchString); 
System.out.println(yourString.subString(start + 1, start + 6); 

Answer 2

您可以輕鬆地使用正則表達式使用Matcher和Pattern

import java.util.regex.*; //import 

    public class stringAfterString { //class declaration 
     public static void main(String [] args) { //main method 
      Pattern pattern = Pattern.compile("(?<=sentence).*"); //regular expression, matches anything after sentence 

      Matcher matcher = pattern.matcher("Some lame sentence that is awesome!"); //match it to this sentence 

      boolean found = false; 
      while (matcher.find()) { //if it is found 
       System.out.println("I found the text: " + matcher.group().toString()); //print it 
       found = true; 
      } 
      if (!found) { //if not 
       System.out.println("I didn't find the text."); //say it wasn't found 
      } 
     } 
    } 

這個代碼是找到並打印字一句後什麼做到這一點。代碼中的註釋說明了它的工作原理。