Teach you to use Java implementation to remove various Spaces

1. String. The trim ()

Trim () is to remove head-and-tail Spaces

2. STR. Replace (" ", ""); Remove all Spaces, including head, tail and middle

String STR = "hell o ";
String str2 = STR. ReplaceAll (" ", "");
System. The out. Println (str2);

3. Or replaceAll(" +",""); Get rid of all Spaces

4. The STR =. ReplaceAll (" \ s * ", "");

Can replace most white space characters, not limited to Spaces
S can match any of the whitespace characters such as Spaces, tabs, page breaks, etc

5. Or the following code can also remove all the Spaces, including the beginning, the end, and the middle

public String remove(String resource,char ch)
  {
    StringBuffer buffer=new StringBuffer();
    int position=0;
    char currentChar;

    while(position<resource.length())
    {
      currentChar=resource.charAt(position++);
      if(currentChar!=ch) buffer.append(currentChar); } return buffer.toString();
  }

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