this means that the JSONObject json == null. You can check this in code before calling methods on the JSONObject. I guess you dont actually get data when you call the httprequest. 2 solved java.lang.NullPointerException occuring, developing android, how do I fix that? [duplicate]
Use the modern Java date and time classes for everything that has got to do with dates or times. DateTimeFormatter usFormatter = DateTimeFormatter.ofLocalizedDate(FormatStyle.SHORT) .withLocale(Locale.US); System.out.println(date.format(usFormatter)); DateTimeFormatter deFormatter = DateTimeFormatter.ofLocalizedDate(FormatStyle.SHORT) .withLocale(Locale.GERMANY); System.out.println(date.format(deFormatter)); This will print something like 6/27/17 27.06.17 It’s not exactly the formats you asked for, but it’s the formats Java thinks are appropriate for … Read more
Here are several ways to get the first character: String str = “x , y – zzzzzz”; System.out.println(str.charAt(0)); System.out.println(str.substring(0, 1)); System.out.println(str.replaceAll(“^(.).*”, “$1”)); See IDEONE demo Choose the one you like more 🙂 UPDATE: To find the first word, you may use the following regex pattern: String pattern = “[\\s\\p{P}]+”; \s stands for whitespace, and \p{P} … Read more
Preface: Given your “console application” doesn’t involve forking any processes or performing any “actual” I/O, you may want to redesign your application to use the TextField and TextArea directly, or at least more directly than you’re currently trying to do. Using System.out and System.in adds a layer of unnecessary indirection and makes everything more complex. … Read more
Consider following: public interface Animal { bool isVertebrate(); bool isDomesticable(); } and an abstract class that implements this interface: abstract class Cat implements Animal { public bool isVertebrate() {return true;} public void dealWithCat(){ if (isDomesticable()){ … } } But implementation for isDomesticable is delegated to subclass: public class Tiger extends Cat { public bool isDomesticable(){ … Read more
You could solve it like this: private static final int MIN = -180; private static final int MAX = 180; public static void main(String[] args) { System.out.println(keepInRange(-150 + 90)); System.out.println(keepInRange(0 + 90)); System.out.println(keepInRange(150 + 90)); System.out.println(keepInRange(-150 – 90)); } private static int keepInRange(final int value) { if (value < MIN) { /* * subtract the … Read more
Why Notes.user? You’re putting an unnecessary dot. Go compare to the link you’ve referenced. Just use Notes or UserNotes solved SQLiteException: unknown database
I hope this might help you as I am doing something similar. Mat gray8 = new Mat(marked.size(), CvType.CV_8UC1); Imgproc.cvtColor(marked, gray8, Imgproc.COLOR_RGB2GRAY); Scalar mean = Core.mean(gray8); Imgproc.threshold(gray8, gray8, mean.val[0], 255, Imgproc.THRESH_BINARY); /*Imgproc.erode(gray8, gray8, new Mat(), new Point(-1, -1), 2);*/ List<MatOfPoint> contours = new ArrayList<MatOfPoint>(); MatOfInt4 hierarchy = new MatOfInt4(); Imgproc.findContours(gray8, contours, hierarchy, Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE); Toast.makeText(getApplicationContext(), contours.size()+” … Read more
just use the same mode on text to speech ADD and it will play when the first one is done, ADD = ADD, FLUSH = reset textToSpeech.speak(“this will play when first is done”, TextToSpeech.QUEUE_ADD, null); solved I am working on OCR reader application. below is my java code. My question is how to start another … Read more
double a = <ur NUmber>; double roundOff = (double) Math.round(a*10)/10; Hope this would help you. here 2.25 would be round off to 2.3 solved Rounding Logic for decimal digits in java [duplicate]
If you want to create an HTML file you need to write some HTML content into the file. It would be more nice if you name the output file with the .html suffix. So after you get the file name from that JTextField, you should add a .html suffix to it’s name and then use … Read more
import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class MainActivity extends Activity{ Cal cal; TextView textView; public void onCreate(Bundle s){ super.onCreate(s); setContentView(R.layout.<your layout name>); // You can not set id of any view here cal = new Cal(this); // This is a object cal.cal(); textView.setText(“”+ cal.result); // set the value instead of view object } } … Read more
Error parsing dataorg.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject solved Error parsing dataorg.json.JSONException: Value
This regex String a = “Want to Start (A) Programming and (B) Designing”; String b = a.replaceAll(“\\(“, “\n\\(“); System.out.println(b); results in Want to Start (A) Programming and (B) Designing Just escape the brackets with \\ and you’re fine. Edit: more specific, like mentioned below a.replaceAll(“(\\([AB]\\))”, “\n$1”); to match only (A) and (B) or a.replaceAll(“(\\(\\w\\))”, “\n$1”); … Read more
i think you should try this public class EmpBean { public java.util.List dataList(){ ArrayList list=new ArrayList(); try{ Class.forName(“driver”); Connection con = DriverManager.getConnection(“url”, “user”, “pwd”); Statement st=con.createStatement(); System.out.println(“hiiiii”); ResultSet rs=st.executeQuery(“select * from employee”); while(rs.next()){ list.add(rs.getString(“name”)); list.add(rs.getString(“address”)); list.add(rs.getString(“contactNo”)); list.add(rs.getString(“email”)); } System.out.println(rs.getString(“contactNo”)); } catch(Exception e){} return list; } } Assuming this class working fine and it is returning … Read more