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Java Output

Java output is the text and numbers a program prints to the screen. The println method prints a value and then ends the line.

println ends the line

Each println call ends its own line. The two calls print two lines.

public class Main {
  public static void main(String[] args) {
    System.out.println("Hello");
    System.out.println("World");
  }
}

print stays on the line

Neither print call ends the line. The two calls share one output line.

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

Numbers print without quotes

A whole number and a decimal number print as numbers. No quotes appear in the output.

public class Main {
  public static void main(String[] args) {
    System.out.println(42);
    System.out.println(3.5);
  }
}

Maths inside println

The expression 3 + 4 is worked out before printing. The result 7 prints.

public class Main {
  public static void main(String[] args) {
    System.out.println(3 + 4);
  }
}

Example

public class Main {
  public static void main(String[] args) {
    System.out.println("Receipt");
    System.out.println("Pen: 3 dollars");
    System.out.println("Book: 5 dollars");
    System.out.print("Total: ");
    System.out.println(3 + 5);
  }
}

Key points

  • println prints a value and ends the line.
  • print prints a value and stays on the same line.
  • Text prints inside double quotes.
  • Numbers print without quotes.
  • A maths expression inside println prints its result.
  • System.out is the output stream of the program.

In this example, the first three lines print a receipt heading and two items. The print call writes the Total label and stays on the line. The last println call adds 3 and 5 and prints 8 beside the label.

Note

println and print are both reached through System.out.

Try it Yourself

Edit the code, then press Run.

Running is simulated · Programiz Java Compiler

Exercise

What does println do after it prints a value?