![{
this.myLL = new LL();
}
public static void main(String[] args)
{
SimpleDateFormat sdf = new
SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss",Locale.ENGLISH);
String myString = null;
Pattern a = Pattern.compile("[0-9]{2}/?[A-Za-z]{3,4}/?[0-9]{4}[.,-:]{1}[0-9.,-
:]{1,}s+");
Pattern d= Pattern.compile("s+/+[0-9.]{3}/+[A-Za-z]{1,}/+[A-Za-z.,-:%]{1,}");
Pattern f= Pattern.compile("s+[0-9]{3}s+");
String newLine;
try {
File file = new File("myFile.txt");
FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader);
String line;
while ((line = bufferedReader.readLine()) != null)
{
myString = line;
System.out.println(myString);
Matcher m1 = a.matcher(myString);
Matcher m2 = d.matcher(myString);
Matcher m3 = f.matcher(myString);
if (m1.find() && m2.find()&& m3.find())
try {
Date parsedDate = sdf.parse(m1.group());
SimpleDateFormat print = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm");
int responseCode = Integer.parseInt(m3.group().trim());
System.out.println(print.format(parsedDate)+ " "+m2.group()+" "+responseCode);
newLine = print.format(parsedDate)+ " "+m2.group();
// decide true or false
if (responseCode >= 500 )
{](https://image.slidesharecdn.com/keepgettinganullpointerexceptionforsomeoddreasonimcreati-230704004147-80549660/85/Keep-getting-a-null-pointer-exception-for-some-odd-reasonim-creati-pdf-4-320.jpg)
![this.myLL = new LL();
}
public static void main(String[] args) {
SimpleDateFormat sdf = new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss",
Locale.ENGLISH);
String myString = null;
Pattern a = Pattern
.compile("[0-9]{2}/?[A-Za-z]{3,4}/?[0-9]{4}[.,-:]{1}[0-9.,-:]{1,}s+");
Pattern d = Pattern
.compile("s+/+[0-9.]{3}/+[A-Za-z]{1,}/+[A-Za-z.,-:%]{1,}");
Pattern f = Pattern.compile("s+[0-9]{3}s+");
String newLine;
try {
File file = new File("myFile.txt");
FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader);
String line;
while ((line = bufferedReader.readLine()) != null) {
myString = line;
System.out.println(myString);
Matcher m1 = a.matcher(myString);
Matcher m2 = d.matcher(myString);
Matcher m3 = f.matcher(myString);
if (m1.find() && m2.find() && m3.find())
try {
Date parsedDate = sdf.parse(m1.group());
SimpleDateFormat print = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm");
int responseCode = Integer.parseInt(m3.group().trim());
System.out.println(print.format(parsedDate) + " "
+ m2.group() + " " + responseCode);
newLine = print.format(parsedDate) + " " + m2.group();
// decide true or false
if (responseCode >= 500) {
if (NewClass4.myLL == null) {
System.out.println("Link List is empty");](https://image.slidesharecdn.com/keepgettinganullpointerexceptionforsomeoddreasonimcreati-230704004147-80549660/85/Keep-getting-a-null-pointer-exception-for-some-odd-reasonim-creati-pdf-8-320.jpg)
Keep getting a null pointer exception for some odd reasonim creati.pdf
- 1. Keep getting a null pointer exception for some odd reason im creating the variable and the object but it still isnt working My code is below please help package classes; /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ import java.io.*; import java.util.*; import java.text.*; import java.util.regex.Matcher; import java.util.regex.Pattern; public class NewClass4 { private class Node { private String text; private int Hit; private int Miss; private Node next; public Node(String text, int Hit, int Miss, Node next) { this.text=text; this.Hit=Hit; this.Miss=Miss; this.next=next; } public void incrementHit() { this.Hit = this.Hit+1; } public void incrementMiss()
- 2. { this.Miss = this.Miss+1; } public String getText() { return this.text; } public int getHit() { return this.Hit; } public int getMiss() { return this.Miss; } }//end of node private class LL { public Node head; public LL() { head=null; } public void insert(String text2, boolean isHit) { System.out.println("entered insert method"); Node temp=this.head; System.out.println("sent temp node to head"); while((temp!=null) && (!temp.text.equals(text2)) ) { temp=temp.next; } if(temp==null) { // we did not find the string if(isHit)
- 3. { this.head=new Node(text2,1, 0, this.head ); } else { this.head=new Node(text2,0, 1, this.head ); } } else { if(isHit) { temp.incrementHit(); } else { temp.incrementMiss(); } } }//end of insert public void printList() { Node temp=this.head; while(temp!=null) { int Hit=temp.getHit(); int Miss=temp.getMiss(); double sucRate=Hit*100/(Hit+Miss); System.out.println(temp.getText() + " " + sucRate); } } }// end of LL private static LL myLL; public NewClass4()
- 4. { this.myLL = new LL(); } public static void main(String[] args) { SimpleDateFormat sdf = new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss",Locale.ENGLISH); String myString = null; Pattern a = Pattern.compile("[0-9]{2}/?[A-Za-z]{3,4}/?[0-9]{4}[.,-:]{1}[0-9.,- :]{1,}s+"); Pattern d= Pattern.compile("s+/+[0-9.]{3}/+[A-Za-z]{1,}/+[A-Za-z.,-:%]{1,}"); Pattern f= Pattern.compile("s+[0-9]{3}s+"); String newLine; try { File file = new File("myFile.txt"); FileReader fileReader = new FileReader(file); BufferedReader bufferedReader = new BufferedReader(fileReader); String line; while ((line = bufferedReader.readLine()) != null) { myString = line; System.out.println(myString); Matcher m1 = a.matcher(myString); Matcher m2 = d.matcher(myString); Matcher m3 = f.matcher(myString); if (m1.find() && m2.find()&& m3.find()) try { Date parsedDate = sdf.parse(m1.group()); SimpleDateFormat print = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm"); int responseCode = Integer.parseInt(m3.group().trim()); System.out.println(print.format(parsedDate)+ " "+m2.group()+" "+responseCode); newLine = print.format(parsedDate)+ " "+m2.group(); // decide true or false if (responseCode >= 500 ) {
- 5. if (NewClass4.myLL == null) { System.out.println("Link List is empty"); } NewClass4.myLL.insert(newLine, false); } else { NewClass4.myLL.insert(newLine, true); } } // end of second try catch (ParseException e) { e.printStackTrace(); } }// end of while fileReader.close(); //System.out.println("Contents of file:"); }//end of first try catch (IOException e) { e.printStackTrace(); } //Classes.myLL.printList(); }// end of main }// end of Classes Solution package classes; /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */
- 6. import java.io.*; import java.util.*; import java.text.*; import java.util.regex.Matcher; import java.util.regex.Pattern; public class NewClass4 { private class Node { private String text; private int Hit; private int Miss; private Node next; public Node(String text, int Hit, int Miss, Node next) { this.text = text; this.Hit = Hit; this.Miss = Miss; this.next = next; } public void incrementHit() { this.Hit = this.Hit + 1; } public void incrementMiss() { this.Miss = this.Miss + 1; } public String getText() { return this.text; } public int getHit() { return this.Hit; } public int getMiss() { return this.Miss; } }// end of node private class LL { public Node head; public LL() {
- 7. head = null; } public void insert(String text2, boolean isHit) { System.out.println("entered insert method"); Node temp = this.head; System.out.println("sent temp node to head"); while ((temp != null) && (!temp.text.equals(text2))) { temp = temp.next; } if (temp == null) { // we did not find the string if (isHit) { this.head = new Node(text2, 1, 0, this.head); } else { this.head = new Node(text2, 0, 1, this.head); } } else { if (isHit) { temp.incrementHit(); } else { temp.incrementMiss(); } } }// end of insert public void printList() { Node temp = this.head; while (temp != null) { int Hit = temp.getHit(); int Miss = temp.getMiss(); double sucRate = Hit * 100 / (Hit + Miss); System.out.println(temp.getText() + " " + sucRate); } } }// end of LL private static LL myLL; public NewClass4() {
- 8. this.myLL = new LL(); } public static void main(String[] args) { SimpleDateFormat sdf = new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss", Locale.ENGLISH); String myString = null; Pattern a = Pattern .compile("[0-9]{2}/?[A-Za-z]{3,4}/?[0-9]{4}[.,-:]{1}[0-9.,-:]{1,}s+"); Pattern d = Pattern .compile("s+/+[0-9.]{3}/+[A-Za-z]{1,}/+[A-Za-z.,-:%]{1,}"); Pattern f = Pattern.compile("s+[0-9]{3}s+"); String newLine; try { File file = new File("myFile.txt"); FileReader fileReader = new FileReader(file); BufferedReader bufferedReader = new BufferedReader(fileReader); String line; while ((line = bufferedReader.readLine()) != null) { myString = line; System.out.println(myString); Matcher m1 = a.matcher(myString); Matcher m2 = d.matcher(myString); Matcher m3 = f.matcher(myString); if (m1.find() && m2.find() && m3.find()) try { Date parsedDate = sdf.parse(m1.group()); SimpleDateFormat print = new SimpleDateFormat( "yyyy-MM-dd'T'HH:mm"); int responseCode = Integer.parseInt(m3.group().trim()); System.out.println(print.format(parsedDate) + " " + m2.group() + " " + responseCode); newLine = print.format(parsedDate) + " " + m2.group(); // decide true or false if (responseCode >= 500) { if (NewClass4.myLL == null) { System.out.println("Link List is empty");
- 9. } NewClass4.myLL.insert(newLine, false); } else { NewClass4.myLL.insert(newLine, true); } } // end of second try catch (ParseException e) { e.printStackTrace(); } }// end of while fileReader.close(); // System.out.println("Contents of file:"); }// end of first try catch (IOException e) { e.printStackTrace(); } // Classes.myLL.printList(); }// end of main }// end of Classes myFile.txt 2011-06-14T04:12 2013-06-14T04:12 2012-06-14T04:12 Note: Please make sure the path of the file is in the project location, i think that is the problem