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Accepting keyboard input in Java is done using a Scanner object. Consider the following statement Scanner console = new Scanner(System.in) This statement declares a reference variable named console. The Scanner object is associated with standard input device (System.in). To get input from keyboard, you can call methods of Scanner class. For example in following statment…
In section 2.3 we have created an HTML form that sends GET request and to handle GET request we created a servlet that uses a doGet method. In section 2.4 we have created an HTML form that sends POST request and to handle POST request we created a servlet that uses a doPost method. Now,…
It is often necessary to compare strings to see if they are the same, or to see which comes first in alphabetical order. It would be nice if we could use the comparison operators, like == and >, but we can’t. To compare Strings, we have to use the equals and compareTo methods. Syntax for using method compareTo : str1.compareTo(str2); The…
File Input Output 10.1 Introduction to File Input and Output 10.2 Writing Data to Text File 10.3 Reading Data from Text File 10.4 Reading and Writing Premitive Data
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Question 1 Write a program to print numbers from 1 to 10. Show the answer. public class PrintNumbers { public static void main(String[] args) { for(int i=1; i<=10; i++) { System.out.println(i); } } } Question 2 Write a program to calculate the sum of first 10 natural number. Show the answer. public class SumNumbers {…
In Java you can create a field or method that does not belong to any object of a class. Such are known as static variables or static methods. Static Variable To declare a static variable, you put them in the class just like instance variables, but you put the keyword static in front. Static variables belong to…
Introduction to File Input and Output Data stored in variables and arrays is temporary — it’s lost when the program terminates. Java allows a program to read data from a file or write data to a file. Once the data is saved in a file on computer disk, it will remain there after the program…
