Output in Java

Lecture 10:- Output in Java

In Java, you can display output to the console or command-line interface using the System.out object, which is an instance of java.io.PrintStream. The most commonly used method for outputting text is System.out.println(), which prints a line of text followed by a newline character. Here are some ways to perform output in Java:

1. Using System.out.println():

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public class OutputExample {
    public static void main(String[] args) {
        System.out.println("Hello, World!"); // Print a line of text with a newline
    }
}

Output:

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Hello, World!

2. Using System.out.print() to print without a newline:

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public class OutputExample {
    public static void main(String[] args) {
        System.out.print("Hello, ");
        System.out.print("World!"); // Print without a newline
    }
}

Output:

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Hello, World!

3. Printing variables:

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public class OutputExample {
    public static void main(String[] args) {
        int age = 25;
        double height = 1.75;
        System.out.println("Age: " + age + ", Height: " + height);
    }
}

Output:

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Age: 25, Height: 1.75

4. Formatting output using String.format():

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public class OutputExample {
    public static void main(String[] args) {
        int number = 42;
        String name = "Alice";
        System.out.println(String.format("Number: %d, Name: %s", number, name));
    }
}

Output:

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Number: 42, Name: Alice

5. Printing multiple lines of text:

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public class OutputExample {
    public static void main(String[] args) {
        System.out.println("Line 1");
        System.out.println("Line 2");
    }
}

Output:

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Line 1
Line 2

Remember that System.out is just one way to perform output in Java. Depending on your application, you may also write output to files or other output streams using various Java classes. Additionally, modern Java frameworks and applications often provide more sophisticated ways of handling output, such as logging libraries. However, System.out remains the simplest and most commonly used method for basic console output.

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