JAVA Three Ways to Intercept String SubString, StringUtils, Split Example Detailed Explanation

JAVA three methods of intercepting strings subString, StringUtils, split

There are mainly the following methods:

1. Use the subString() method to perform string interception (most commonly used)

2. Methods provided by StringUtils

3. Split() + regular expression to intercept

1. Use the subString() method to intercept strings and return substrings in strings. There are two uses in Java

The first type is to pass a parameter:

public String substring(int beginIndex)               
 //This substring starts with the character at the specified index until the end of the string.  public String substring(int beginIndex) //This substring starts with the character at the specified index，Until the end of this string。

The second type is to pass two parameters:

public String substring(int beginIndex, int endIndex)  
//From the specified beginIndex Beginning，Until the index endIndex - 1 Characters at。therefore，The length of the substring is endIndex-beginIndex。

//Parameter description: beginIndex -- Start index (including), endIndex -- End index (excluding).
Sample code:

public static void main(String[] args) {
    String Str = new String("hello wrold");  
    ("Return value, intercepted from bit 4 to the end of the string:" );
    ((4) );
    ("Return value, intercepting from bit 4 to bit 10:" );
    ((4, 10) );
}

Running results

Return value, intercepted from bit 4 to the end of the string: o whole
Return value, intercepting from bit 4 to bit 10 : o wrol

2. Methods provided by StringUtils

//The effect is the same as the first method("hello world", 4);     // Return value, intercepted from bit 4 to the end of the string: o whole("hello world", 4, 10); // Return value, intercept from bit 4 to bit 10: o wrol//Seave the characters before a string("hello world", "l"); 
//The result is: he here is the first "l", as the standard.("hello world", "l");
//The result is: hello wor Here the last "l" is the basis.//Seave the characters after a string("hello world", "l");
//The result is: lo world Here is the first "l", which is the standard.("hello world", "l");
//The result is: d Here the last "l" is the basis.//Seave characters separated between two strings("hello world", "o");    
//The result is: w The string between two os.("hello world", "l", "r"); 
//The result is: lo wo string between the first character "l" and the first character "r"("hello world", "l", "r");
//turn out：Array [lo wo]   The first character“l”与The first character“r”String between，以Array形式返回。

Use StringUtils to import common-lang3 package

<dependency>
            <groupId></groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.12.0</version>
        </dependency>

3. Split() + regular expression to intercept

Snipped strings as splitters and returned as arrays

String str = "hello, name, 12345, 6789";
String[]  strs=(",");
for(int i=0,len=;i<len;i++){
    (strs[i].toString());
}

Running results

hello
name
12345
6789

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