How to use the split method in Java String-javaTutorial-php.cn

Table of Contents

String中split方法使用

1、一般用法

2、需要转义的分隔符

3、多个符号作为分隔符

4、空值的存储

String.split()需要的转义字符

转义字符

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How to use the split method in Java String

May 02, 2023 am 09:37 AM

java split string

String中split方法使用

String的split()方法用于按传入的字符或字符串对String进行拆分，返回拆分之后的数组。

1、一般用法

用一般的字符，例如@或,等符号做分隔符时：

String address=&quot;上海@上海市@闵行区@吴中路&quot;;
String[] splitAddr=address.split(&quot;@&quot;);
System.out.println(splitAddr [0]+splitAddr [1]+splitAddr [2]+splitAddr [3]);

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2、需要转义的分隔符

当使用* ^ : | . \等6个符号做分隔符时，上述6个符号转义字符,必须得加"\\"，即split(“\\^”)等。第二个“\”是用来给这6种符号转义，第一个“\”是用来给第二个“\”转义。

String address=&quot;上海*上海市*闵行区*吴中路&quot;;
String[] splitAddr=address.split(&quot;\\*&quot;);  
System.out.println(splitAddr[0]+splitAddr[1]+splitAddr[2]+splitAddr[3]);

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其中有个更特殊的，就是“\”。如果字符串中想要使用"\"，就应该使用"\\"进行转义。也就是说，对于"a\b"，应该写成"a\\b"，而如果想要用split方法针对"\"进行拆分，应该使用"a\\b".split("\\\\")。

3、多个符号作为分隔符

可以用“|”字符作为连字符，把多个分隔符分隔的内容都区分开：

String address=&quot;上海^上海市@闵行区#吴中路&quot;;
String[] splitAddr=address.split(&quot;\\^|@|#&quot;);
System.out.println(splitAddr[0]+splitAddr[1]+splitAddr[2]+splitAddr[3]);

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4、空值的存储

如果split(String s)函数产生了空值，那么不会存到数组中。可以通过使用它的重载函数split(";"，-1)实现空值的保存。这里的“;”只是作为分隔符的一个例子。

String.split()需要的转义字符

注意“/”和“-”,"&"不是转义字符。

String str=&quot;aaaa/aaaa/aaaa&quot;;
String[] strings=str.split(&quot;/&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa-aaaa-aaaa&quot;;
String[] strings=str.split(&quot;-&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa&amp;aaaa&amp;aaaa&quot;;
String[] strings=str.split(&quot;&amp;&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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转义字符

|
\
$
*
+
.
?
^
(
)
[
]
{
}

String str=&quot;aaaa|aaaa|aaaa&quot;;
String[] strings=str.split(&quot;\\|&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa\\aaaa\\aaaa&quot;;
String[] strings=str.split(&quot;\\\\&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa$aaaa$aaaa&quot;;
String[] strings=str.split(&quot;\\$&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa*aaaa*aaaa&quot;;
String[] strings=str.split(&quot;\\*&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa+aaaa+aaaa&quot;;
String[] strings=str.split(&quot;\\+&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa.aaaa.aaaa&quot;;
String[] strings=str.split(&quot;\\.&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa?aaaa?aaaa&quot;;
String[] strings=str.split(&quot;\\?&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa^aaaa^aaaa&quot;;
String[] strings=str.split(&quot;\\^&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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String str=&quot;aaaa(aaaa(aaaa&quot;;
String[] strings=str.split(&quot;\\(&quot;);
for (int i = 0; i &lt; strings.length; i++) {
    System.out.println(strings[i]);
}

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所有的括号都是转义字符。

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