考虑以下代码:了解Pattern和Matcher
import java.util.regex.*;
public class Pattern3 {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
Pattern p = Pattern.compile("Our"); //line 1
Matcher m = p.matcher("Our mom and Our dad"); //line 2
//p.compile(mom); commented line
StringBuffer s = new StringBuffer();
boolean found = m.find();
while (found){
m.appendReplacement(s, "My"); //line 3
found=m.find();
}
m.appendTail(s); //line 4
System.out.println(s);
}
}
一)为什么我需要调用m.appendTrail(s)
第4行,以获得unchopped字符串?
b)当我取消注释并将"mom"
作为新的正则表达式时,为什么输出不会改变?