用 Java 在字串中查詢字元和子字串
以下 Java 程式用於在字串中搜索字元和子字串 −
示例
import java.io.*; import java.lang.*; public class Demo { public static void main (String[] args) { String test_str = "Hello"; CharSequence seq = "He"; boolean bool_1 = test_str.contains(seq); System.out.println("Was the substring found? " + bool_1); boolean bool_2 = test_str.contains("Lo"); System.out.println("Was the substring found? " + bool_2); } }
輸出
Was the substring found? true Was the substring found? False
Demo 類中包含 main 函式。在此,定義字串並建立 CharSequence 例項。使用與字串關聯的 ‘contains’ 函式檢查原始字串中是否包含特定的子字串。然後將其列印在螢幕上。
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