Several ways to remove all spaces in a string in Java

Removing spaces in JAVA

1. String.trim()

trim() removes leading and trailing spaces

2.str.replace(" ", "" ); Remove all spaces, including the beginning, end and middle

String str = " hell o ";  
String str2 = str.replaceAll(" ", "");  
System.out.println(str2);

3. Or replaceAll(" +",""); Remove all spaces

4.str = .replaceAll("\\s *", "");
Can replace most whitespace characters, not limited to spaces
\s can match any of the whitespace characters such as spaces, tabs, form feeds, etc.

Update For related articles on several methods to remove all spaces in strings in Java, please pay attention to the PHP Chinese website!