You can’t apply the ++ operator to a string, but you can implement this logic yourself. I’d go over the string from its end and handle each character individually until I hit a character that can just be incremented simply: public static String increment(String s) { StringBuilder sb = new StringBuilder(s); boolean done = false; … Read more
Here’s a way with nested loops (semi-pseudocode): int x ; //check if x is a multiple of any two factors < x for (int i1 = 2 ; i1 < x ; i1++) { for (int i2 = i1 ; i2 < x ; i2++) { prod = i1 * i2 ; if (prod > … Read more
In Java if you leave the access specifier off then the member is “package” level. Package level members can be seen by the class that defines the member and other classes in the same package. The difference between that and private are private members may only be seen by the class which defines it. 10 … Read more
It looks like there is already an api for just that: new CountDownTimer(30000, 1000) { public void onTick(long millisUntilFinished) { mTextField.setText(“seconds remaining: ” + millisUntilFinished / 1000); } public void onFinish() { mTextField.setText(“done!”); } }.start(); Reference: http://developer.android.com/reference/android/os/CountDownTimer.html solved How to use Chronometer on Android?
If you have to check if str is equal to a string in strarray so you have to cycle it. for(int i = 0; i<strarray.length; i++){ if(str.equals(strarray[i])){ System.out.println(strarray[i]+” help me”); } } 2 solved How can i check string value in String array?
In your code you add values to this.list and check obj.getArrlstValues(), when this != obj. So you never update the same list you look at! You can use this.getArrlstValues() (or just getArrlstValues()) and remove this line: Test obj=new Test() 5 solved Java- how to temporarily store data in array-list
I have just removed the following lines of code from the jComboBox.addActionListener(new ActionListener(){ … }); What I am doing is, adding model to table two times that why it is not getting the selected row. After removing following lines of code it works fine. table = new JTable(model); table3 = new JTable(model1); table.setRowHeight(30); table3.setRowHeight(30); JScrollPane … Read more
Can i use Context.getDir() with MOD_PRIVATE to do it ? That directory is already private. I want to download .apk file and install programmatically That is not possible, unless the installer has access to the file, which is only possible if you make the file world-readable. 10 solved Is there a way to securely store … Read more
You can do this. However I don’t think it’s good practise. my first concern is the potential for null pointer exceptions (NPEs). If you write a.getB().getC().getD(), any one of these can return null. You can’t tell which returned null in the resulting stack trace (excluding the last invocation returning null, which is fine). You may … Read more
Why is that? Because Main() is static. If Main() was an instance method, and you had called Main() on an instance of myClass (e.g., new myClass), then doThis() could also be an instance method. Or, if your static Main() created an instance of myClass, it could call doThis() on that instance. When I develop some … Read more
Consider the following example using toUpperCase which is also an instance method. It works in this case because the Stream item that is being handled is of the same type as the class of the method being invoked. So the item actually invokes the method directly. So for Stream.of(“abcde”).map(String::toUpperCase).forEach(System.out::println); the String::toUpperCase call will be the … Read more
I want to understand the working of this Java program in detail? Why are we doing it and how are we taking such values to solve this? solved I want to understand the working of this Java program in detail? Why are we doing it and how are we taking such values to solve this?
The category is of type String which uses the String equals() implementation. 6 solved Java equal vs == (String Instance Variable) [duplicate]
You’ve got some options. Either with string concatenation, right in the spot that you want it (mind the number of quotes): System.out.println(“Since there are (” + bluerocks + “) there must be less than 12 normal rocks”); …or with symbol substitution, via printf: System.out.printf(“Since there are (%d) there must be less than 12 normal rocks”, … Read more
I need to pass the formatter to some other methods(for formatting Y axis in a bar chart) I’ll leave the implementation details as a learning exercise for you, but one straightforward way would be to create your own subclass of DecimalFormat that overrides the various format methods, does the math, and passes the resulting modified … Read more