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FilenameFilter filters filenames

2022-08-09 16:03:00 【Yunhaigutian】

Foreword:

File IO is a feature of programming languages. This article will test Java's File filename filtering.

Screenshot of test directory:

Test results:

data.txtoutput-3.txtoutput-4.txtoutput-d.txtpeople-id.txtqqmusic_cn_seed.txttext-a20.txt---finish ----

Version 1: Interface inheritance

package com.yeezhao.common.io.v1;import java.io.File;import java.io.FilenameFilter;import java.util.regex.Pattern;public class MyFilenameFilter implements FilenameFilter {final static String REGEX = ".*\\.txt";@Overridepublic boolean accept(File dir, String name) {return Pattern.matches(REGEX, name);}}

package com.yeezhao.common.io.v1;import java.io.File;import java.util.Arrays;public class FilenameFilterV1 {public static void main(String[] args) throws Exception{System.out.println("--- start ----");File file = new File("c://test");String[] list = file.list(new MyFilenameFilter());Arrays.sort(list, String.CASE_INSENSITIVE_ORDER); //Ignore string case for dictionary sortingfor(String l:list){System.out.println(l);}System.out.println("--- finish ----");}}

Version 2: Inner class initializes inner object properties

package com.yeezhao.common.io.v2;import java.io.File;import java.io.FilenameFilter;import java.util.Arrays;import java.util.regex.Pattern;public class FilenameFilterV2 {private static String REGEX = ".*\\.txt";private static FilenameFilter filter = new FilenameFilter() {@Overridepublic boolean accept(File dir, String name) {return Pattern.matches(REGEX, name);}};public static void main(String[] args) throws Exception {File file = new File("c://test");String[] list = file.list(filter);Arrays.sort(list, String.CASE_INSENSITIVE_ORDER); //Ignore string case for dictionary sortingfor (String l : list) {System.out.println(l);}System.out.println("--- finish ----");}}

Version 3: inner classes directly call methods

package com.yeezhao.common.io.v3;import java.io.File;import java.io.FilenameFilter;import java.util.Arrays;import java.util.regex.Pattern;public class FilenameFilterV3 {private static String REGEX = ".*\\.txt";public static void main(String[] args) {File file = new File("c://test/");String[] list = file.list(new FilenameFilter() {@Overridepublic boolean accept(File dir, String name) {return Pattern.matches(REGEX, name);}});Arrays.sort(list, String.CASE_INSENSITIVE_ORDER); //Ignore string case for dictionary sortingfor (String l : list) {System.out.println(l);}System.out.println("--- finish ----");}}

Attachment: list() method of File object

Afterword:

Java.io involves quite a lot of tool classes. I hope to get started with some of the content of java.nio after research and compare it!

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