java string 去掉空格

JAVA中去掉空格

1. String.trim()

trim()是去掉首尾空格



2.str.replace(" ", ""); 去掉所有空格，包括首尾、中间

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



3.或者replaceAll(" +",""); 去掉所有空格



4.str = .replaceAll("\\s*", "");

可以替换大部分空白字符， 不限于空格
\s 可以匹配空格、制表符、换页符等空白字符的其中任意一个



5.或者下面的代码也可以去掉所有空格，包括首尾、中间

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

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

测试的全部代码如下：

public class test1 {

public static void main(String[] args) {

String QJstr = " hello wch ";

String QJstr1 = remove(QJstr,' ');

System.out.println(QJstr + "\n" + QJstr1);

}



public static String remove(String resource,char ch)

{

StringBuffer buffer=new StringBuffer();

int position=0;

char currentChar;



while(position
{

currentChar=resource.charAt(position++);

if(currentChar!=ch) buffer.append(currentChar);

}

return buffer.toString();

}

}

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