用正则表达式去掉多余的空格与标点符号 Java

public class StringUtil {
public void demo() {
// String stringInfo =
// "{infoNum='10' EdwardBlog='http://hi.baidu.com/Edwardworld'       topicLength='20'    titleShow='yes' EdwardMotto='I am a man,I am a true man!' /}";
String stringInfo = "Madam,         I'm Adam";
System.out.println("待处理的字符串：" + stringInfo);

Pattern p = Pattern.compile("[.,\"\\?!:']");// 增加对应的标点
Matcher m = p.matcher(stringInfo);

String first = m.replaceAll(""); // 把英文标点符号替换成空，即去掉英文标点符号
System.out.println("去掉英文标点符号后的字符串：" + first);

p = Pattern.compile(" {2,}");// 去除多余空格
m = p.matcher(first);
String second = m.replaceAll(" ");
System.out.println("去掉多余空格后的字符串" + second);// second为最终输出的字符串

second = first.replace(" ", "");
System.out.println("去掉所有空格：" + second);
}
}