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In this program, we will create a tree structure using JTree and DefaultMutableTreeNode in Java to represent a hierarchical structure, such as a website. We will then use the getChildCount() method to retrieve and display the number of child nodes for specific nodes in the tree. The example focuses on nodes that are not root nodes and prints the count of child nodes for each. Let’s say we want the count of child nodes for node 1, which is not a root node − node1.getChildCount() Steps to get the count of child nodes of any node in JTree Following are ... Read More
In this article, we will subtract two integers and check if the result causes an overflow in Java. To check for Integer overflow, we need to check the Integer.MAX_VALUE with the subtracted integers result, Here, Integer.MAX_VALUE is the maximum value of an integer in Java. Let us see an example wherein integers are subtracted and if the result is more than Integer.MAX_VALUE, then an exception is thrown. Problem Statement Write a program in Java to subtract integers and check for overflow − Input val1 = 9898999val2 = 8784556 Output Value1: 9898999 Value2: 8784556 Subtraction Result: 1114443 Steps to subtract integers and check ... Read More
In this article, we will learn to remove path information from a filename returning only its file component using Java. The method fileCompinent() is used to remove the path information from a filename and return only its file component. This method requires a single parameter i.e. the file name and it returns the file component only of the file name. Problem Statement Write a program in Java to remove path information from a filename returning only its file component − Input "c:\JavaProgram\demo1.txt" The input is the file path. Output demo1.txt Steps to remove path information Following are the steps to remove ... Read More
In this program, we will demonstrate how to retrieve the parent directory of a file using the File class in Java. The name of the parent directory of the file or directory can be obtained using the method getParent() method using the java.io package. This method returns the parent directory path name string or null if there is no parent named. Steps to get the name of the parent directory Following are the steps to get the name of the parent directory − We will start by importing the java.io.File class. Create a ... Read More
In this program, we will connect to a MySQL database and insert a null value into a table using Java's JDBC API. We will use the PreparedStatement class along with the setNull() method to achieve this. After the value is inserted, you can check the table to see how the null value is reflected. Steps to insert null value into a MySQL database Following are the steps to insert null value into a MySQL database − Establish a connection to the MySQL database using the DriverManager.getConnection() method. Define the SQL query that ... Read More
In this article, we will understand how to interchange elements of first and last in a matrix across columns in Java. The matrix has a row and column arrangement of its elements. A matrix with m rows and n columns can be called as m × n matrix. Individual entries in the matrix are called elements and can be represented by a[i][j] which suggests that the element a is present in the ith row and jth column. Problem Statement Write a Java program to interchange elements of first and last in a matrix across columns. Input The matrix is defined as: ... Read More
A year has 12 months which are named January, February, March, April, May, June, July, August, September, October, November, December. These are the complete names of the months and there are multiple ways to represent them like short format, complete format, MM or 2 integers format. In this article, we are going to see how to display names of months of calendar year in short format with the help of Java. There are numerous ways to do so and are as follows − Using a String Array ... Read More
In this article, we will learn how to select all the items in a JList in Java. The program creates a simple graphical user interface with a list of sports. It uses the setSelectionInterval() method to select all items in the list. This ensures that from the first item to the last item in the list, everything is selected when the program runs. Problem Statement Write a Java program to select all the items in a JList. Below is the demonstration of the same − Input sports[]= {"Football", "Fencing", "Cricket", "Squash", "Hockey", "Rugby"} Output Steps to select all ... Read More
In recent years, deep learning has moved from research labs to the heart of mainstream business applications. It powers everything from personalized recommendations on Netflix to self-driving cars. However, just because it’s popular doesn’t mean it’s always the right choice for your project. Deciding when to use deep learning and when to consider other options is crucial for achieving both efficiency and success. This guide will help you determine whether deep learning is a good fit for your next project. W to choose Deep Learning for your project depends on many factors listed below: 1. The Nature of Your Data ... Read More
To group Pandas data frame, we use groupby(). To sort grouped data frames in ascending or descending order, use sort_values(). The size() method is used to get the data frame size. Steps Involved The steps included in sorting the panda's data frame by its group size are as follows. Importing the panda's library and Creating a Pandas dataframe. Grouping the columns by using the groupby() function and sorting the ... Read More