Java String包含示例 Java toUpperCase()方法 Java String to Lower Case示例 Java String包含示例 import java.lang.*; public class StringDemo { public static void main(String[] args) { String str1 = "tutorials point", str2 = "http://"; CharSequence cs1 = "int"; // string contains the specified sequence of char values boolean retval = str1.contains(cs1); System.out.println("方法 returns : " + retval); // string does not contain the specified sequence of char value retval = str2.contains("_"); System.out.println("Methods returns: " + retval); } } Java toUpperCase()方法 Java String to Lower Case示例