正则表达式实现替换字符串封装类

import java.util.regex.Matcher;
import java.util.regex.Pattern;

//正则表达式替换字符方法
public class PatternReplaceExmple{

private static Pattern p ;
private static Matcher m ;

//str为要匹配的字符格式
public static void setPattern(String str){
p = Pattern.compile(str);
}

public static void setPattern(String str,int i){
p = Pattern.compile(str,i);
}
//str为要匹配字符串
public static void setMatcher(String str){
m = p.matcher(str);
}

//str为替换匹配字符格式的字符
public static String replace(String str){
StringBuffer buf = new StringBuffer();
while(m.find()){
m.appendReplacement(buf,str);
}
m.appendTail(buf);
return buf.toString();
}

}

import java.util.Date;
import java.util.regex.Pattern;

public class A {

public static void main(String args[]){
//Pattern.CASE_INSENSITIVE为不区分大小写
PatternReplaceExmple.setPattern("jav",Pattern.CASE_INSENSITIVE );
PatternReplaceExmple.setMatcher("sdlfjjavalj adj a vaaljkJAvakljljJavA lkjlj ");
System.out.println(PatternReplaceExmple.replace("haha"));
}
}