Help to solve the static method....pls.

Question

package readtext;
import java.io.*; // For input & output classes
import java.util.Date; // For the Date class
public class Main {
public Main() {
public static void main(String[] args)
throws IOException{
BufferedReader in = new BufferedReader(
new FileReader("C:/Documents and Settings/seng/Desktop/testfile/txt.txt"));
*use ' ' as a separator, and rearrange back the datastream column
String text;
while ((text = in.readLine()) != null)
int count = 0; // Number of substrings
char separator = ' '; // Substring separator
// Determine the number of substrings
int index = 0;
do
++count; // Increment count of substrings
++index; // Move past last position
index = text.indexOf(separator, index);
while (index != -1);
// Extract the substring into an array
String[] subStr = new String[count]; // Allocate for substrings
index = 0; // Substring start index
int endIndex = 0; // Substring end index
for(int i = 0; i < count; i++)
endIndex = text.indexOf(separator,index); // Find next separator
if(endIndex == -1) // If it is not found
subStr[i] = text.substring(index); // extract to the end
else // otherwise
subStr[i] = text.substring(index, endIndex); // to end index
index = endIndex + 1; // Set start for next cycle
String dirName = "C:/Documents and Settings/seng/Desktop/testfile";
// Directory name
File aFile = new File(dirName, "data.txt");
aFile.createNewFile(); // Now create a new file if necessary
if(!aFile.isFile()) // Verify we have a file
System.out.println("Creating " + aFile.getPath() + " failed.");
return;
BufferedWriter out = new BufferedWriter(new FileWriter(aFile.getPath(), true));
* Display output at data.txt file
// provide initial (X,Y,Z) coordinates for mobiles
out.write("$node_(" + subStr[0] + ") set X_ " + subStr[0] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Y_ " + subStr[1] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Z_ " + subStr[2] +
System.getProperty("line.separator"));
out.flush();
out.close();
package readtext;
import java.io.*; // For input & output classes
import java.util.Date; // For the Date class
public class create_table {
public create_table() {
public static void main(String[] args)
throws IOException{
BufferedReader in = new BufferedReader(
new FileReader("C:/Documents and Settings/seng/Desktop/testfile/txt.txt"));
*use ' ' as a separator, and rearrange back the datastream column
String text;
while ((text = in.readLine()) != null)
substring(subStr); //problem at here
String dirName = "C:/Documents and Settings/seng/Desktop/testfile";
// Directory name
File aFile = new File(dirName, "data.txt");
aFile.createNewFile(); // Now create a new file if necessary
if(!aFile.isFile()) // Verify we have a file
System.out.println("Creating " + aFile.getPath() + " failed.");
return;
BufferedWriter out = new BufferedWriter(new FileWriter(aFile.getPath(), true));
* Display output at data.txt file
// problem at here
// provide initial (X,Y,Z) coordinates for mobiles
out.write("$node_(" + subStr[0] + ") set X_ " + subStr[0] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Y_ " + subStr[1] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Z_ " + subStr[2] +
System.getProperty("line.separator"));
out.flush();
out.close();
static void substring(String[] subStr)
int count = 0; // Number of substrings
char separator = ' '; // Substring separator
String text;
// Determine the number of substrings
int index = 0;
do
++count; // Increment count of substrings
++index; // Move past last position
index = text.indexOf(separator, index);
while (index != -1);
// Extract the substring into an array
subStr = new String[count]; // Allocate for substrings
index = 0; // Substring start index
int endIndex = 0; // Substring end index
for(int i = 0; i < count; i++)
endIndex = text.indexOf(separator,index); // Find next separator
if(endIndex == -1) // If it is not found
subStr[i] = text.substring(index); // extract to the end
else // otherwise
subStr[i] = text.substring(index, endIndex); // to end index
index = endIndex + 1; // Set start for next cycle
*on top is the original code, bottom is after modified
i would like to create a static method for the static void substring(String[] subStr). But when i use the substring() on the main program, the compiler give me error. Is that my substring () created wrongly?? pls help...

Answer 1

package readtext;
import java.io.*; // For input & output classes
import java.util.Date; // For the Date class
public class Main {
public Main() {
public static void main(String[] args)
throws IOException{
BufferedReader in = new BufferedReader(
new FileReader("C:/Documents and Settings/seng/Desktop/testfile/txt.txt"));
*use ' ' as a separator, and rearrange back the datastream column
String text;
while ((text = in.readLine()) != null)
int count = 0; // Number of substrings
char separator = ' '; // Substring separator
// Determine the number of substrings
int index = 0;
do
++count; // Increment count of substrings
++index; // Move past last position
index = text.indexOf(separator, index);
while (index != -1);
// Extract the substring into an array
String[] subStr = new String[count]; // Allocate for substrings
index = 0; // Substring start index
int endIndex = 0; // Substring end index
for(int i = 0; i < count; i++)
endIndex = text.indexOf(separator,index); // Find next separator
if(endIndex == -1) // If it is not found
subStr = text.substring(index); // extract to the end
else // otherwise
subStr = text.substring(index, endIndex); // to end index
index = endIndex + 1; // Set start for next cycle
String dirName = "C:/Documents and Settings/seng/Desktop/testfile";
// Directory name
File aFile = new File(dirName, "data.txt");
aFile.createNewFile(); // Now create a new file if necessary
if(!aFile.isFile()) // Verify we have a file
System.out.println("Creating " + aFile.getPath() + " failed.");
return;
BufferedWriter out = new BufferedWriter(new FileWriter(aFile.getPath(), true));
* Display output at data.txt file
// provide initial (X,Y,Z) coordinates for mobiles
out.write("$node_(" + subStr[0] + ") set X_ " + subStr[0] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Y_ " + subStr[1] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Z_ " + subStr[2] +
System.getProperty("line.separator"));
out.flush();
out.close();
package readtext;
import java.io.*;                            // For input & output classes
import java.util.Date;                       // For the Date class
public class create_table {
   public create_table() {
   public static void main(String[] args)
   throws IOException{
  BufferedReader in = new BufferedReader(
          new FileReader("C:/Documents and Settings/seng/Desktop/testfile/txt.txt"));
   *use ' ' as a separator, and rearrange back the datastream column
   String text;
   while ((text = in.readLine()) != null)
    String[] subStr;
     String[] substring;
     int i;
   substring(subStr); //PROBLEM: substring in readtext can not apply
String dirName = "C:/Documents and Settings/seng/Desktop/testfile";
// Directory name
File aFile = new File(dirName, "data.txt");
aFile.createNewFile(); // Now create a new file if necessary
if(!aFile.isFile()) // Verify we have a file
System.out.println("Creating " + aFile.getPath() + " failed.");
return;
BufferedWriter out = new BufferedWriter(new FileWriter(aFile.getPath(), true));
* Display output at data.txt file
// provide initial (X,Y,Z) coordinates for mobiles
out.write("$node_(" + subStr[0] + ") set X_ " + subStr[0] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Y_ " + subStr[1] +
System.getProperty("line.separator") +
"$node_(" + subStr[0] + ") set Z_ " + subStr[2] +
System.getProperty("line.separator"));
out.flush();
out.close();
static void substring(String[] subStr)
int count = 0; // Number of substrings
char separator = ' '; // Substring separator
String text;
// Determine the number of substrings
int index = 0;
do
++count; // Increment count of substrings
++index; // Move past last position
index = text.indexOf(separator, index);
while (index != -1);
// Extract the substring into an array
subStr = new String[count]; // Allocate for substrings
index = 0; // Substring start index
int endIndex = 0; // Substring end index
for(int i = 0; i < count; i++)
endIndex = text.indexOf(separator,index); // Find next separator
if(endIndex == -1) // If it is not found
subStr[i] = text.substring(index); // extract to the end
else // otherwise
subStr[i] = text.substring(index, endIndex); // to end index
index = endIndex + 1; // Set start for next cycle
the problem is here
   String text;
   while ((text = in.readLine()) != null)
    String[] subStr;
     String[] substring;
     int i;
   substring(subStr); //PROBLEM: substring in readtext can not apply
String dirName = "C:/Documents and Settings/seng/Desktop/testfile";
the system say that my substring(subStr[i]) (java.lang.String[])in read.text can not applied to (java.lang.String)...how can i solve for tis problem? is that i have to use for loop to create an array for subStr???