Java字符串split() _字符串split()

本文概述

Java String split()方法示例
带有正则表达式和长度示例的Java String split()方法
带有正则表达式和长度示例2的Java String split()方法

Java字符串split()方法根据给定的正则表达式拆分此字符串, 并返回一个char数组。
内部实施

public String[] split(String regex, int limit) { /* fastpath if the regex is a (1)one-char String and this character is not one of the RegEx's meta characters ".$|()[{^?*+\\", or (2)two-char String and the first char is the backslash and the second is not the ascii digit or ascii letter. */ char ch = 0; if (((regex.value.length == 1 & & ".$|()[{^?*+\\".indexOf(ch = regex.charAt(0)) == -1) || (regex.length() == 2 & & regex.charAt(0) == '\\' & & (((ch = regex.charAt(1))-'0')|('9'-ch)) < 0 & & ((ch-'a')|('z'-ch)) < 0 & & ((ch-'A')|('Z'-ch)) < 0)) & & (ch < Character.MIN_HIGH_SURROGATE || ch > Character.MAX_LOW_SURROGATE)) { int off = 0; int next = 0; boolean limited = limit > 0; ArrayList< String> list = new ArrayList< > (); while ((next = indexOf(ch, off)) != -1) { if (!limited || list.size() < limit - 1) { list.add(substring(off, next)); off = next + 1; } else {// last one //assert (list.size() == limit - 1); list.add(substring(off, value.length)); off = value.length; break; } } // If no match was found, return this if (off == 0) return new String[]{this}; // Add remaining segment if (!limited || list.size() < limit) list.add(substring(off, value.length)); // Construct result int resultSize = list.size(); if (limit == 0) while (resultSize > 0 & & list.get(resultSize - 1).length() == 0) resultSize--; String[] result = new String[resultSize]; return list.subList(0, resultSize).toArray(result); } return Pattern.compile(regex).split(this, limit); }

签名
java字符串中的split()方法有两个签名。

public String split(String regex) and, public String split(String regex, int limit)

参数
regex：将应用于字符串的正则表达式。
limit：数组中字符串数的限制。如果为零, 它将返回所有与正则表达式匹配的字符串。
退货
字符串数组
投掷
【Java字符串split()】PatternSyntaxException如果正则表达式的模式无效
以来
1.4
Java String split()方法示例给定的示例返回字符串中的单词总数, 仅不包括空格。它还包括特殊字符。

public class SplitExample{ public static void main(String args[]){ String s1="java string split method by srcmini"; String[] words=s1.split("\\s"); //splits the string based on whitespace //using java foreach loop to print elements of string array for(String w:words){ System.out.println(w); } }}

立即测试

java string split method by srcmini

带有正则表达式和长度示例的Java String split()方法

public class SplitExample2{ public static void main(String args[]){ String s1="welcome to split world"; System.out.println("returning words:"); for(String w:s1.split("\\s", 0)){ System.out.println(w); } System.out.println("returning words:"); for(String w:s1.split("\\s", 1)){ System.out.println(w); } System.out.println("returning words:"); for(String w:s1.split("\\s", 2)){ System.out.println(w); }}}

立即测试

returning words: welcome to split world returning words: welcome to split world returning words: welcome to split world

带有正则表达式和长度示例2的Java String split()方法在这里, 我们将拆分限制作为第二个参数传递给此函数。这限制了分割字符串的数量。

public class SplitExample3 { public static void main(String[] args) { String str = "srcminitt"; System.out.println("Returning words:"); String[] arr = str.split("t", 0); for (String w : arr) { System.out.println(w); } System.out.println("Split array length: "+arr.length); } }