Java PrintStream Class

August 4, 2023

What is Java PrintStream Class?

The Java PrintStream class is part of the java.io package and provides a way to print formatted representations of objects to a text-output stream.

It extends the OutputStream class and has methods such as print(), println(), format(), printf(), and flush(). It can be used to write data to a file or any other type of output stream.

To understand the more about Java PrintStream Class, Read the Complete Article.

Working of PrintStream:

The PrintStream class in Java works by taking input from various sources such as standard input, files, or network sockets and converting them into a sequence of bytes. It then sends these bytes to the underlying output stream.

The PrintStream class in Java has various methods such as print(), println(), format(), printf(), and flush(), which enable you to format and print data to the output stream. When you use any of these methods, the PrintStream class converts the data into a sequence of bytes and sends them to the output stream. If the output stream is buffered, you may need to call the flush() method to make sure that all data is written to the stream.

You can create a PrintStream object using one of its constructors, which take an OutputStream as a parameter. This allows you to specify the destination of the output stream, such as a file or network socket.

Overall, the PrintStream class provides a convenient way to format and print data to an output stream in Java.

Create a PrintStream:

To create a PrintStream object in Java, you need to first create an OutputStream object that represents the destination where you want to write the data.

Then, you can pass this OutputStream object as a parameter to one of the PrintStream constructors.

Advantages of using try-with-resources:

Convenient formatting: The PrintStream class provides several methods for formatting output, such as print(), println(), format(), and printf(). These methods make it easy to format data for printing, without having to manually convert it into a string.

Output redirection: By passing an OutputStream to the PrintStream constructor, you can redirect output to a file, network socket, or any other type of output stream.

Error handling: The PrintStream class has a checkError() method, which you can use to check if any errors have occurred during output. This makes it easy to detect and handle errors in your code.

Thread safety: The PrintStream class is thread-safe, meaning that multiple threads can safely use the same instance of the class to write to an output stream.

Methods of PrintStream

Methods	Description
print()	This method prints a given string to the output stream.
println()	This method prints a given string to the output stream, followed by a line separator.
printf()	These methods allow you to format a string with specified arguments, and print it to the output stream.
flush()	This method flushes the output stream, ensuring that any buffered data is written to the underlying output device.
checkError()	This method returns a boolean value indicating whether an error has occurred on the output stream.

These methods provide a convenient way to format and print data to an output stream using the PrintStream class in Java.

Introduction to java

static variable in java

If statement in Java

Switch Statement in Java

Abstraction in Java

Example 1: Java Program to print() method with System class

Run

public class Main{
    public static void main(String[] args) {
        System.out.print("Hello");
        System.out.print(", ");
        System.out.print("world!");
    }
}

Output

Hello, world!

Explanation:

In this program, we use the print() method of the System class to print three strings to the console: "Hello", and "world!". Each print() method call outputs its argument to the console without adding a newline character, so the three strings are printed on the same line.

Example 2: Java Program to printf() method using PrintStream

Run

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        FileOutputStream fos = new FileOutputStream("output.txt");
        PrintStream ps = new PrintStream(fos);
        
        double pi = Math.PI;
        int x = 42;
        String s = "Java";
        
        ps.printf("The value of pi is approximately %.2f\n", pi);
        ps.printf("The answer to everything is %d\n", x);
        ps.printf("Hello, %s!\n", s);
        
        ps.close();
        fos.close();
    }
}

Output

The value of pi is approximately 3.14
The answer to everything is 42
Hello, Java!

Explanation:

In this program, we create a PrintStream object ps that writes to a file named "output.txt". We then use the printf() method of the PrintStream class to format and print three lines of output:

The first line prints the value of pi with two decimal places using the format specifier %.2f.

The second line prints the integer x.

The third line prints a string s.

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Java PrintStream Class

What is Java PrintStream Class?

Working of PrintStream:

Advantages of using try-with-resources:

Methods of PrintStream

Example 1: Java Program to print() method with System class

Output

Example 2: Java Program to printf() method using PrintStream

Output

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