Several ways to remove all spaces in a string in Java

Remove spaces in JAVA

1. String.trim()

trim() removes leading and trailing spaces

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

Copy the code code as follows:

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.