跳至主要內容
02-Java String charAt() Method

Example

Return the first character (0) of a string:

返回字符串的第一个字符(0):

String myStr = "Hello";
char result = myStr.charAt(0);
System.out.println(result);  // H

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01-Java String contains() Method

Example

Find out if a string contains a sequence of characters:

找出一个字符串是否包含一个字符序列:

String myStr = "Hello";
System.out.println(myStr.contains("Hel"));   // true
System.out.println(myStr.contains("e"));     // true
System.out.println(myStr.contains("Hi"));    // false

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