Java 中的 StringTokenizer 类

原文:https://www . geeksforgeeks . org/stringtokenizer-class-in-Java/

Java 中的 StringTokenizer 类用于将字符串分解成标记。StringTokenizer 对象在内部维护要标记化的字符串中的当前位置。某些操作会将当前位置推进到已处理的字符之外。通过获取用于创建 StringTokenizer 对象的字符串的子字符串来返回标记。

插图:

stringtokenizer

StringToken 的构造函数:让我们考虑“str”是要标记化的字符串

  1. StringTokenizer(字符串):默认分隔符，如换行符、空格、制表符、回车符和换行符。
  2. StringTokenizer(String str，String delim): delim 是一组用于标记给定字符串的分隔符。
  3. StringTokenizer(String str，String delim，布尔标志):前两个参数具有相同的含义，其中标志 用于以下目的。

3.1: 如果标志为假，分隔符用于分隔标记

示例:

Input : if string --> "hello geeks" and Delimiter is " ", then 
Output:  tokens are "hello" and "geeks".

3.2: 如果标志为真，则分隔符字符被视为令牌。

示例:

Input : String --> is "hello geeks"and Delimiter is " ", then 
Output: Tokens --> "hello", " " and "geeks".

字符串生成器类的方法

| 方法 | 已执行的操作 | | --- | --- | | [计数令牌()](https://www.geeksforgeeks.org/stringtokenizer-counttokens-method-in-java-with-examples/) | 返回存在的令牌总数 | | [hasMoreToken()](https://www.geeksforgeeks.org/stringtokenizer-hasmoretokens-method-in-java-with-examples/) | 测试字符串的字符串中是否存在标记 | | [nextElement()](https://www.geeksforgeeks.org/stringtokenizer-nextelement-method-in-java-with-examples/#:~:text=The%20nextElement()%20method%20of,Object%20rather%20than%20the%20String.) | 返回一个对象而不是字符串 | | [【hasmorellis()](https://www.geeksforgeeks.org/stringtokenizer-hasmoreelements-method-in-java-with-examples/) | 返回与 hasMoreToken 相同的值 | | [外令牌()](https://www.geeksforgeeks.org/stringtokenizer-nexttoken-method-in-java-with-examples/) | 从给定的 StringTokenizer 返回下一个标记。 |

实施:

Java 语言(一种计算机语言，尤用于创建网站)

// Java Program to Illustrate StringTokenizer Class

// Importing requieed classes
import java.util.*;

// Main class
public class GFG {

    // Main driver method
    public static void main(String args[])
    {

        // Constructor 1
        System.out.println("Using Constructor 1 - ");

        // Creating object of class inside main() method
        StringTokenizer st1 = new StringTokenizer(
            "Hello Geeks How are you", " ");

        // Condition holds true till there is single token
        // remaining using hasMoreTokens() method
        while (st1.hasMoreTokens())

            // Getting next tokens
            System.out.println(st1.nextToken());

        // Constructor 2
        System.out.println("Using Constructor 2 - ");

        // Again creating object of class inside main()
        // method
        StringTokenizer st2 = new StringTokenizer(
            "JAVA : Code : String", " :");

        // If tokens are present
        while (st2.hasMoreTokens())

            // Print all tokens
            System.out.println(st2.nextToken());

        // Constructor 3
        System.out.println("Using Constructor 3 - ");

        // Again creating object of class inside main()
        // method
        StringTokenizer st3 = new StringTokenizer(
            "JAVA : Code : String", " :", true);

        while (st3.hasMoreTokens())
            System.out.println(st3.nextToken());
    }
}

Output

Using Constructor 1 - 
Hello
Geeks
How
are
you
Using Constructor 2 - 
JAVA
Code
String
Using Constructor 3 - 
JAVA

:

Code

:

String

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