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Course Content
Introduction
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Data Types
Comments
Variables
Input/Output
Arithmetic Operators
Type Conversion
Reserved Word
Introduction Examples
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Basics Of Java
03:00
Flow Control
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Relational && Logical Operators
if…else Statement
switch Statement
Iteration through Loop
For Loop
While Loop
Do- While Loop
break and continue
Revise: Flow Control
Flow Control
Flow Control
03:00
Array
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Array
Array Input
for-each Loop
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Array Quiz
Strings
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Strings
Character Methods
String Methods
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String Quiz
03:00
Methods
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Java Methods
Standard Library methods
Function Header
Types of Function
Revise Method
Project
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Building Logic
Project: Guess the Number Game
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Learn Java Basics
About Lesson

Various ways to Input in Java

There are several different ways to read input from the user. Here are some of the most common methods:

  1. Scanner class: This is the most common way to read input in Java. You can create a Scanner object to read input from the console, a file, or a string. Here’s an example of how to read a string input from the console using Scanner:

    Scanner input = new Scanner(System.in);
    String str = input.nextLine();

  2. BufferedReader class: This class provides a more efficient way to read input from the console or a file compared to Scanner. Here’s an example of how to read a string input from the console using BufferedReader:

    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    String str = reader.readLine();

  3. Console class: This class provides a way to read input and print output to the console without creating a Scanner or BufferedReader object. However, it is only available in environments where the console is available, such as running Java from the command line. Here’s an example of how to read a string input from the console using Console:

    Console console = System.console();
    String str = console.readLine();

  4. JOptionPane class: This class provides a way to read input and print output using dialog boxes instead of the console. It is typically used for simple GUI applications. Here’s an example of how to read a string input using JOptionPane:

    String str = JOptionPane.showInputDialog(null, "Enter a string:");

These are just a few of the many ways to read input in Java. The choice of which method to use depends on the specific requirements of your program.

Various ways to Output in Java

There are several ways to output data to the console or a file. Here are some of the most common methods:

  1. System.out.println(): This method prints a string to the console and adds a newline character at the end. For example:
System.out.println("Hello, world!");
  1. System.out.print(): This method prints a string to the console without adding a new line character. For example:
System.out.print("Hello, ");
System.out.print("world!");
  1. System.out.printf(): This method allows you to format your output using placeholders. For example:
int num = 5;
System.out.printf("The value of num is %d", num);
  1. System.err.println(): This method prints an error message to the console and adds a newline character at the end. For example:
System.err.println("Error: file not found");
  1. PrintWriter: This class allows you to write output to a file instead of the console. For example:
PrintWriter writer = new PrintWriter("output.txt");
writer.println("Hello, world!");
writer.close();
  1. FileWriter: This class is similar to PrintWriter but is used for writing to a file in append mode. For example:
FileWriter writer = new FileWriter("output.txt", true);
writer.write("Hello, world!");
writer.close();

These are just a few examples of how to output data in Java. The best method to use depends on the specific requirements of your application.

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