Java: static-non-static-this problem
- by HH
$ javac TestFilter.java
TestFilter.java:19: non-static variable this cannot be referenced from a static context
for(File f : file.listFiles(this.filterFiles)){
^
1 error
$ sed -i 's@this@TestFilter@g' TestFilter.java
$ javac TestFilter.java
$ java TestFilter
file1
file2
file3
TestFilter.java
import java.io.*;
import java.util.*;
public class TestFilter {
private static final FileFilter filterFiles;
// STATIC!
static{
filterFiles = new FileFilter() {
// Not Static below. When static, an error:
// "accept(java.io.File) in cannot implement
// accept(java.io.File) in java.io.FileFilter;
// overriding method is static"
//
// I tried to solve by the change the problem at the bottom.
public boolean accept(File file) {
return file.isFile();
}
};
}
// STATIC!
public static void main(String[] args){
HashSet<File> files = new HashSet<File>();
File file = new File(".");
// IT DID NOT WORK WITH "This" but with "TestFilter".
// Why do I get the error with "This" but not with "TestFilter"?
for(File f : file.listFiles(TestFilter.filterFiles)){
System.out.println(f.getName());
files.add(f);
}
}
}
