不输入参数输出结果为
.project
.settings
bin
src输入参数"D.*\.java"
无输出结果
File path = new File(".");
这里的"."代表什么?我不明白//: io/DirList.java
// Display a directory listing using regular expressions.
// {Args: "D.*\.java"}
import java.util.regex.*;
import java.io.*;
import java.util.*;public class DirList {
public static void main(String[] args) {
File path = new File(".");
String[] list;
if(args.length == 0)
list = path.list();
else
list = path.list(new DirFilter(args[0]));
Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
for(String dirItem : list)
System.out.println(dirItem);
}
}class DirFilter implements FilenameFilter {
private Pattern pattern;
public DirFilter(String regex) {
pattern = Pattern.compile(regex);
}
public boolean accept(File dir, String name) {
return pattern.matcher(name).matches();
}
} /* Output:
DirList.java*///:~
.project
.settings
bin
src输入参数"D.*\.java"
无输出结果
File path = new File(".");
这里的"."代表什么?我不明白//: io/DirList.java
// Display a directory listing using regular expressions.
// {Args: "D.*\.java"}
import java.util.regex.*;
import java.io.*;
import java.util.*;public class DirList {
public static void main(String[] args) {
File path = new File(".");
String[] list;
if(args.length == 0)
list = path.list();
else
list = path.list(new DirFilter(args[0]));
Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
for(String dirItem : list)
System.out.println(dirItem);
}
}class DirFilter implements FilenameFilter {
private Pattern pattern;
public DirFilter(String regex) {
pattern = Pattern.compile(regex);
}
public boolean accept(File dir, String name) {
return pattern.matcher(name).matches();
}
} /* Output:
DirList.java*///:~
. 代表当前所在目录
这句是找D盘下的*.java,注意是精确匹配不是操作系统的模糊匹配,如果要模糊匹配,只能根据后缀名用正则表达式匹配....
D.*\.java 这个真不知道