FileExample.java
import java.util.*;
import java.awt.*;
import java.io.*;
class WildFilter implements FilenameFilter {
private String suffix = null;
WildFilter(String _suffix) {
suffix = _suffix;
}
public boolean accept(File f, String fn) {
return fn.endsWith(suffix);
}
}
public class TrivialApplication {
double sum =0;
String s
= "T,h#is i,s my n#ew str#ing!! 1 #2 3";
StringTokenizer st
= new StringTokenizer(s,",");
public void init() {
//while (st.hasMoreTokens())
//System.out.println( st.nextToken());
writeFile();
}
public void print(String s[]) {
if (s==null) {
System.out.println("Null in print!!");
}
for (int i=0; i < s.length; i++)
System.out.println(s[i]);
}
public String [] ls() {
File f = getFile("select a file");
return f.list(new WildFilter("txt"));
}
public static void main(String args[]) {
TrivialApplication
ta = new TrivialApplication();
ta.init();
}
public void addNumber(double d ) {
sum += d;
System.out.println(d+" sum is"+ sum);
}
public void processFile(StreamTokenizer st)
throws IOException {
int next = 0;
while ((next = st.nextToken())!=
st.TT_EOF)
switch (next) {
case st.TT_WORD: break;
case st.TT_NUMBER:
addNumber(st.nval);
}
}
public void writeFile(PrintWriter pw) {
for (int i=0; i < 100; i++)
pw.println("Happy Thanksgiving!!"+i);
}
public void writeFile() {
String fn = getWriteFileName("Enter a file");
try {
FileOutputStream os =
new FileOutputStream(fn);
PrintWriter pw =
new PrintWriter(os);
writeFile(pw);
pw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void processFile(String fn) {
try {
FileInputStream fis
= new FileInputStream(fn);
StreamTokenizer st
= new StreamTokenizer(fis);
processFile(st);
fis.close();
}
catch(IOException e) {
e.printStackTrace();
}
}
public File getFile(String prompt) {
String fn = getDirectoryName(prompt);
File f = new File(fn);
//System.out.println("File="+f);
return f;
}
public String getFileName(String prompt) {
FileDialog
fd = new FileDialog(new Frame(),
prompt);
fd.setVisible(true);
fd.setVisible(false);
return fd.getDirectory()+fd.getFile();
}
public String getWriteFileName(String prompt) {
FileDialog
fd = new FileDialog(new Frame(),
prompt,FileDialog.SAVE);
fd.setVisible(true);
fd.setVisible(false);
return fd.getDirectory()+fd.getFile();
}
public String getDirectoryName(String prompt) {
FileDialog
fd = new FileDialog(new Frame(),
prompt);
fd.setVisible(true);
fd.setVisible(false);
return fd.getDirectory();
}
}