The answer to your problem with writing to the file is every time you are writing to the file you are over writing what was there before, what you need to do is change FileOutputStream fos = openFileOutput(“TotalSavings”, Context.MODE_PRIVATE) to: FileOutputStream fos = openFileOutput(“TotalSavings”, Context.MODE_PRIVATE | Context.MODE_APPEND) This tells android you want to append to … Read more
In future, I’d suggest you refrain from begging for answers without first showing some code you’ve tried. That being said, I’ll bite. import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.SecureRandom; public class EncryptHelper { public static String ehashAndSalt(String passedpass) throws NoSuchAlgorithmException, NoSuchProviderException { String passwordToHash = “password”; String salt = getSalt(); String securePassword = getSecurePassword(passwordToHash, … Read more
If you don’t provide a valid long as input it throws NumberFormatException. See below: long converted = Long.valueOf( “3” ); System.out.println( converted ); Prints 3 try{ long converted = Long.valueOf( “TEST” ); System.out.println( converted ); } catch( NumberFormatException e ){ System.out.println( “Your input is wrong..” ); } This throws NumberFormatException, it’s because not a valid … Read more
There’s a couple factors missing from your question that makes me unable to completely answer them, but: Is the courseGrade method in a separate class or in the same class as your public static void main method? Yes: Create a new instance of the separate class by doing: public SeparateClass instance = new SeparateClass(); inside … Read more
I’ll probably get down voted for providing an answer, because you are providing no clear question, and you aren’t showing any effort to solve your problem yourself before the community helps you. What I’m able to decipher from your sample result is there is no need for ArrayList if you’re given two inputs m and … Read more
Integer.parseInt(“hello”) statement will throw an exception: java.lang.NumberFormatException 2 solved What happens to a int i = Integer.parseInt(string) when there are no integers in string?
This is an alternative that does not require to create a custom Comparator. I’m proposing it only for the sake of completeness. Split the String in words. Create a SortedMap. Iterate on the word list. Populate it with “%03d%05d”.format(999-aWord.length(),i) -> aWord , where i is the index of aWord in in the word list. Here, … Read more
First, add implements Comparable<Student> to class header and compareTo() method to Student class: @Override public int compareTo(Student other) { return Integer.valueOf(this.indexnr).compareTo(other.indexnr); } Then, sort your list: List<Student> list3 = …; //some logic to fill list Collections.sort(list3); solved Java. Compare two objects values in LinkedList
As already mentioned there is no certain way to detect encoding. But there is a large amount of heuristics that allow to do a smart guess about file encoding. If there is no way for you to get to know the encoding for sure you may have a look at Apache Tika project and EncodingDetector … Read more
Well @Fencer300, Simply make a simple bean class (Model class with getter setter methd ) // make a city bean class public class cityModel implements Serializable { private String fajr; // do for more same ass public String getFajr() { return fajr; } public void setFajr(String fajr) { this.fajr= fajr; } } protected void outputTimings(JSONArray … Read more
The problem is here: contentPane.add(textPane, BorderLayout.CENTER); At this point, you haven’t set up textPane. You set it up 4 lines later: textPane = new JTextPane(); textPane.setBackground(Color.DARK_GRAY); textPane.setEditable(false); textPane.setMargin(null); textPane.setContentType(“text/html”); You need to add it to the pane after initializing. Simple debugging would have fixed this problem for you. SO is not an appropriate place for … Read more
Put these 2 lines inside onCreate() after findViewById, then you can use context. SharedPreferences store = PreferenceManager.getDefaultSharedPreferences(getApplication()); SharedPreferences.Editor edit = store.edit(); solved Unfortunately, [APP] has stopped! WHAT am i doing wrong? [closed]
I don’t know why your IDE is showing the red squiggly where it is, but the problem is with the b=0; line. At that point, you’re in the top level of your class. You can’t have assignments there, they can only be in methods, constructors, or initializer blocks. The reason int a=0; works is that … Read more
You provided very little information about what kind of logic this would be, but in any case it should be inside the class Child. Depending on what kind of logic it is I would probably put it inside the constructor. Suppose you have the following: public class Child(){ public static int age = 1; public … Read more
String.contains() accepts CharSequence as argument and doesn’t “trigger” regexes that it or processing string may contain. Returns true if and only if this string contains the specified sequence of char values. From here. solved If I use string.contains() on a string that may have regular expressions [closed]