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Console format(String, Object) method in Java with Examples

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The format(String, Object) method of Console class in Java is used to write a formatted string to the output stream of the console. It uses the specified format string and arguments. Syntax:
public Console format(String fmt,
                      Object... args)
Parameters: This method accepts two parameters:
  • fmt – It represents the format of the string.
  • args – It represents the arguments that are referenced by the format specifiers in the string format.
Return value: This method returns the console. Exceptions: This method throws IllegalFormatException if string format contains an illegal syntax or a format specifier is not compatible with the given arguments or insufficient arguments given the format string or other conditions that are illegal. Note: System.console() returns null in an online IDE. Below programs illustrate format(String, Object) method in Console class in IO package: Program 1:
// Java program to illustrate
// Console format(String, Object) method
  
import java.io.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // Create the console object
        Console cnsl
            = System.console();
  
        if (cnsl == null) {
            System.out.println(
                "No console available");
            return;
        }
  
        String fmt = "%1$4s %2$10s %3$10s%n";
  
        cnsl.format(fmt, "Books", "Author", "Price");
        cnsl.format(fmt, "-----", "------", "-----");
        cnsl.format(fmt, "DBMS", "Navathe", "800");
        cnsl.format(fmt, "Algorithm", "Cormen", "925");
        cnsl.format(fmt, "Operating System", "Rajib Mall", "750");
    }
}

                    
Output:
Program 2:
// Java program to illustrate
// Console format(String, Object) method
  
import java.io.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // Create the console object
        Console cnsl
            = System.console();
  
        if (cnsl == null) {
            System.out.println(
                "No console available");
            return;
        }
  
        String fmt = "%1$4s %2$10s %3$10s%n";
  
        cnsl.format(fmt, "Items", "Quantity", "Price");
        cnsl.format(fmt, "-----", "------", "-----");
        cnsl.format(fmt, "Tomato", "1 Kg", "80");
        cnsl.format(fmt, "Apple", "3 Kg", "500");
        cnsl.format(fmt, "Potato", "2 Kg", "75");
    }
}

                    
Output:
References: https://docs.oracle.com/javase/10/docs/api/java/io/Console.html#format(java.lang.String, java.lang.Object…)

Last Updated : 12 Jun, 2020
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