06 Java Fundamentals | Output in Java | By Dummy for Dummies
So, fellow monkeys we learned taking input, now let's talk about giving output on screen. We are already familiar with print though, i.e:
System.out.println("Hello, World!");
This same line is used for every output but with a bit modifications for different purposes. They are as follow (we will be focusing on golden lines):
1. SIMPLE OUTPUT:
public class Main {
public static void main(String[] args){
System.out.print("Hello, World!");
}
}
OUTPUT:
System.out = System gives output
print = Print the content ahead
("Hello, World!") = The content inside bracket is printed.
Another way to print it is:
public class Main {
public static void main(String[] args){
System.out.print("Hello");
System.out.print("World");
}
}
HelloWorld
2. OUTPUT WITH NEXT LINE:
public class Main {
public static void main(String[] args){
System.out.println("Hello, World!");
}
}
OUTPUT:
Hello, World!
println = Print the content ahead and go to next line
3. OUTPUT WITH VARIABLE:
public class Main {
public static void main(String[] args){
int age = 20;
System.out.println("Your age: " + age);
}
}
OUTPUT:
Your age: 20"Your age: " = Prints this as it is
4. FORMATED OUTPUT:
public class Main {
public static void main(String[] args){
int age = 20;
System.out.printf("Your age: %d", age);
}
}
OUTPUT:
Your age: 20"Your age: " = Prints this as it is
public class OutputDemo {
public static void main(String[] args) {
// Variables for each datatype
int age = 20;
double gpa = 3.75;
char grade = 'A';
String name = "Hassan";
boolean pass = true;
// Demonstrating placeholders with escape sequences
System.out.printf("Student Details:\n");
// \n = next line
// %s for string
System.out.printf("Name:\t%s\n", name);
//prints tab space + name + new line
// %d for integer
System.out.printf("Age:\t%d\n", age);
//prints tab space + age + new line
// %f for double
System.out.printf("GPA:\t%.2f\n", gpa);
// prints tab space + GPA + new line (%.2f = 2 numbers after decimal)
// %c for character
System.out.printf("Grade:\t%c\n", grade);
//prints tab + grade + new line
// %b for boolean
System.out.printf("Passed:\t%b\n", pass);
//prints tab + pass +new line
// Special escape sequences
System.out.printf("Quote Example:\t\"Work hard, dream big!\"\n");
//prints Quote Example: "Work hard, dream big!"
System.out.printf("Backslash Example:\tC:\\Users\\Hassan\n");
//prints Quote Example" C:\Users\Hassan"
}
}
OUTPUT:
EXERCISE
We have covered enough topics to go for an exercise. In this exercise I want you to study this code, break it down, analyze it and identify the concepts used here. It would be even better if you write down your observations and make a mini report on it. You can extend the program to accept a second student and print both reports
import java.util.Scanner;
public class Exercise {
public static void main(String[] args) {
// --- Introduction + First Program ---
System.out.println("Welcome to Java Fundamentals Exercise!");
System.out.println("Let's practice everything we have learned so far.\n");
// --- Variables & Data Types ---
String name;
int age;
double gpa;
char grade;
boolean pass;
// --- Input ---
Scanner input = new Scanner(System.in);
System.out.print("Enter your name: ");
name = input.nextLine();
System.out.print("Enter your age: ");
age = input.nextInt();
System.out.print("Enter your GPA: ");
gpa = input.nextDouble();
System.out.print("Enter your grade (A-F): ");
grade = input.next().charAt(0);
System.out.print("Did you pass the last exam? (true/false): ");
pass = input.nextBoolean();
System.out.println("\n--- Generating Report ---\n");
// --- Operators ---
int nextYearAge = age + 1; // arithmetic operator
boolean isAdult = age >= 18; // relational operator
boolean eligible = isAdult && pass; // logical operator
// --- Output ---
System.out.printf("Student Report for %s\n", name);
System.out.printf("Age: %d (Next year: %d)\n", age, nextYearAge);
System.out.printf("GPA: %.2f\n", gpa);
System.out.printf("Grade: %c\n", grade);
System.out.printf("Passed: %b\n", pass);
System.out.println("\nExtra Info:");
System.out.println("Are you an adult? " + isAdult);
System.out.println("Eligible for next level? " + eligible);
System.out.printf("\nQuote of the Day:\t\"Work hard, dream big!\"\n");
System.out.printf("File Path Example:\tC:\\Users\\%s\n", name);
input.close();
}
}
OUTPUT:
MINI PROJECT: (Student Report Card)
Your project is to create a simple Java program that worls like a student report card.
The program should ask the user for the student’s name and marks of three subjects (integers or decimals). It should calculate the total and the average of the marks. It should decide whether the student has passed or failed. The rule is: Pass if the average is 40 or more, and none of the marks is zero.
Finally, the program should print a formatted report using printf The report must include:⦿ Total marks
⦿ Average (2 decimal places)
While writing the program, make sure you use a scanner method for each datatype you use plus Arithmetic, relational, logical operators and printf with placeholders like %s , %d , %.2f
EXAMPLE OUTPUT:
CLOSING
That’s it for Output in Java! We now know how to make our program talk back, whether it’s a single word, a full sentence, or a nicely formatted report.