Consider this: public static void printFirstHalf(int m, int n){ if(m>n){ return; } // print asterix for(int i=1; i<=m; i++){ System.out.print(“*”); } System.out.println(); // recurse printFirstHalf(m+1,n); } Do you see where you went wrong with your other method now? If you’re working with recursion for the first time, I understand that it can be difficult but … Read more
I guess, you want to store first list items as keys and second list items as values in a HashMap. For that, you need to create a hashmap of string, string type as given below and store all its value there. HashMap<String, String> hmap = new HashMap<String, String>(); for(int i=0;i<a1.size();i++){ hmap.put(a1.get(i),a11.get(i)); } for(Map.Entry m:hmap.entrySet()) { … Read more
algorithm for finding the number of 1s in a matrix (only vertical 1s). The image is self explanatory that what i exactly want solved algorithm for finding the number of 1s in a matrix (only vertical 1s). The image is self explanatory that what i exactly want
There are a lot of specifications missing for the question, but the basic concept might be the following: Listen the events for the container resizing with a ComponentListener In the Event listener make the resize logic, for example by increasing the font size until the text does not fit in the container. See this example. … Read more
The nullpointer exception basic reason is that you are calling a method or variable from null variable where with null variable I mean a variable which is currently not holding reference of any object. So, the easy way to avoid it is assign that variable a refernce on which subsequent tasks can be called Now … Read more
If you don’t already have a list of rhyming words, you will just have to enter them all like that (or put them all in a config file of some kind and read that in), but either way you’re just typing them all in. What you are calling harvesting from rhymezone is called scraping. You … Read more
When Ok is pressed after the pin is entered you need to verify if the entered pin is the same as the saved pin, if yes you can open the activity you want to. You need to have an edittext to collect the pin. <EditText android:id=”@+id/passwordedittext” android:layout_width=”200dp” android:layout_height=”wrap_content” android:inputType=”textPassword”> <requestFocus /> An ok button is … Read more
You’ll need instance variables for the things you want to track, for example firstName, lastName, address. You can set and retrieve these values by making getters and setters for every instance variable. You could also make a constructor which assings the given arguments to the instance variables when you create a new resident, since every … Read more
I also think if you had defined it as a character it might simply your work. where you defined float innum; char plus=”+”; char minus=”+”; char times=”x”; … and then you use `if (Character.toString(OP).matches(plus)) { // … } this will make your work more granular. solved how to read math symbols
If it is an Array of objects it will be initialized with null, if it’s an array of primitive values (like int) it will be initialized with 0. For the non-number primitive boolean it is false and for ‘char’ it is ‘\u0000’. For more information, check the table Default Values on the following page: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html … Read more
Here is a sample app that demonstrates how to do this. This example uses setTextFill() and setFont() inside the setCellFactory method. import javafx.application.Application; import javafx.beans.property.SimpleStringProperty; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.event.ActionEvent; import javafx.geometry.Insets; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.TableCell; import javafx.scene.control.TableColumn; import javafx.scene.control.TableView; import javafx.scene.control.cell.PropertyValueFactory; import javafx.scene.layout.HBox; import javafx.scene.layout.VBox; import javafx.scene.paint.Color; import javafx.scene.text.Font; … Read more
Try replacing you method with this, public static char upperCaseToLowerCase(char ch){ ch = ch.toLowerCase(); return ch; } solved Converting Uppercase to Lowercase using char
No. == compares the references. this means == compares where in the memory the object is saved. hashCode() creates an integer from the attributes of an Object (the algorithm for this operation may vary from class to class). Comparison of objects should be done via o1.equals(o2). 2 solved what is hash code and how it … Read more
I guess I found the solution. At least, I found the answer I need. Here is my answer import java.math.BigInteger; public class Problem7 { public static void main(String[]args) { int i = 0; int counter = 0; while(true) { if(i>6) { break; } if(i>1) { String str = String.valueOf(i); if (new BigInteger(str).isProbablePrime(i/2)) { System.out.println(str); counter++; … Read more
You can use OS redirection operators java Test < inputFile > outputFile then this public class Test { public static void main(String[] args) throws IOException { for(int i; (i = System.in.read()) != -1;) { System.out.write((byte)i); } } } will copy from inputFile to outputFile 7 solved Give standard input to program through files and take … Read more