jdk源码详解之StringTokenizer

jdk源码详解之StringTokenizer

1.类释义

The string tokenizer class allows an application to break a string into tokens

2.

3.类方法

3.1 hasMoreTokens()

译：判断在这个tokenizer 字符串中是否有更多可用的tokens。如果这个方法返回 true，那么后续对无参的nextToken()【nextToken()方法分两种，分别是有参和无参的】的调用将会成功返回一个token。

3.2 nextToken()

3.3 StringTokenizer()

public StringTokenizer(String str)

Constructs a string tokenizer for the specified string. The tokenizer uses the default delimiter set, which is " \t\n\r\f": the space character, the tab character, the newline character, the carriage-return character, and the form-feed character. Delimiter characters themselves will not be treated as tokens.

Parameters:
    str - a string to be parsed.
Throws:
    NullPointerException - if str is null

注意默认的分隔符是哪几个。空格，tab，换行符，回车符，换页符

4.简单示例

4.1

package test;

import java.util.StringTokenizer;

public class TestStringTokenizer {

    public static void main(String args[]) {
        StringTokenizer st = new StringTokenizer("this is a test");
        while (st.hasMoreTokens()) {
            System.out.println(st.nextToken());
        }
    }
}