What are the methods for intercepting strings in Java?-javaTutorial-php.cn

1 .substring()

This is a more commonly used method.

This method has two forms:

substring(int beginIndex); //提取从索引位置开始至结尾处的字符串部分 substring(int beginIndex,int endIndex); //提取beginIndex开始到endIndex的字符串部分

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Instance code:

String str = "你好，Java练习生"; //substring(int beginIndex); String substring1 = str.substring(3); //substring(int beginIndex,int endIndex); String substring2 = str.substring(3, 7); System.out.println(substring1);//Java练习生 System.out.println(substring2);//Java

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It should be noted that:The counting starts from 0, if it exceeds the character If the string length is too long, an error will be reported:

java.lang.StringIndexOutOfBoundsException: String index out of range:

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Calculation position diagram

What are the methods for intercepting strings in Java?

##2 split() regular expression

is not commonly used, but in certain Especially useful in certain situations.

Format:

String.split("specify delimiter");–returns an array

Example (using English comma as delimiter):

String str = "good,good,study,day,day,up"; String[] split = str.split(","); for (String s: split) { System.out.println(s); }

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What are the methods for intercepting strings in Java?

3 StringUtils.substring()

You need to import the StringUtils tool class. A combination of many methods.

Because everyone uses different tools, only one type is recorded.

maven import:

 com.lispcast org.apache.commons.lang 2.5.0

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String substring(String str,int start): Avoid abnormally obtaining a substring from the specified String.
String substring(String str,int start, int end): It can avoid abnormally obtaining a substring from the specified String.
String substringAfter(String str,String separator): Get the substring after the first occurrence of the separator.
String substringAfterLast(String str,String separator): Gets the substring after the last occurrence of the separator.
String substringBefore(String str,String separator): Gets the substring before the first occurrence of the separator.
String substringBeforeLast(String str,String separator): Gets the substring before the last occurrence of the separator.
String substringBetween(String str,String tag): Get the String nested between two instances of the same String.
String substringBetween(String str, String open, String close): Get the string nested between two strings.

Test:

String str = "大家好，我是练习两年半的个人练习生，cxk"; //- String substring(String str,int start)：避免异常地从指定的String获取一个子字符串。 String substring1 = StringUtils.substring(str, 4); //- String substring(String str,int start, int end)：可避免异常地从指定的String获取一个子字符串。 String substring2 = StringUtils.substring(str, 4, 7); //- String substringAfter(String str,String separator)：在第一次出现分隔符后获取子字符串。 String substringAfter = StringUtils.substringAfter(str, "，"); //- String substringAfterLast(String str,String separator)：在最后一次出现分隔符之后获取子字符串。 String substringAfterLast = StringUtils.substringAfterLast(str, "，"); //- String substringBefore(String str,String separator)：在第一次出现分隔符之前获取子字符串。 String substringBefore = StringUtils.substringBefore(str, "，"); //- String substringBeforeLast(String str,String separator)：在最后一次出现分隔符之前获取子字符串。 String substringBeforeLast = StringUtils.substringBeforeLast(str, "，"); //- String substringBetween(String str,String tag)：获取嵌套在同一String的两个实例之间的String。 String substringBetween1 = StringUtils.substringBetween(str, "，"); // - String substringBetween(String str, String open, String close)：获取嵌套在两个字符串之间的字符串。 String substringBetween2 = StringUtils.substringBetween(str, "好", "的"); System.out.println(substring1); System.out.println(substring2); System.out.println(substringAfter); System.out.println(substringAfterLast); System.out.println(substringBefore); System.out.println(substringBeforeLast); System.out.println(substringBetween1); System.out.println(substringBetween2);

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What are the methods for intercepting strings in Java?

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