Java Output Formatting

Sometimes we want a program's output to be displayed in a specific format. The printf () function in the C programming language can be used to achieve this. We will talk about the varied output formatting in this section.

Sometimes printing the output in a specific format is necessary while using competitive programming. In C, the printf function is widely used. Let's talk about formatting the output in Java.

In Java, formatting the output can be done in one of two ways:

• Making use of the Printf() Method
• Making use of the format () Method

Output Formatting using System.out.printf() method

Because this Method is identical to the printf() function used in C programming, its implementation is quite simple.

OutputFormatting.java

import java .io .*;


public class JavaCallable  
{  
  public static void main ( String args[ ] )  
  {  
    // Printing the string using the printf method in Java  
    String s = " Hello word " ;  
    System.out.printf( " 
 The String value using printf() : %s 
 ", s ) ;  
    // Printing the Integer using the printf method in Java   
    int i = 45 ;  
    System.out.printf( " 
 The Integer value using printf() : i = %d 
 ", i ) ;  
    // Printing the float using the printf method in Java  
    float f = 8.456f ;  
    System.out.printf( " 
 The float value using printf() : %f 
 ", f ) ;  
    // formatting the float value to a specific decimal number using %.nf in printf  
    System.out.printf( " 
 Formating the float value to specific decimal : f = %.4f 
 ", f ) ;  
    // formatting the float value to a specific decimal number using %.nf in printf  
    System.out.printf( " 
 Formating the float value to two decimal : f = %.2f 
 ", f ) ;  
    // formatting the float value to a specific right margin number using %n.mf in printf  
    System.out.printf( " 
 Formating the float value right margin : n = %20.4f 
 ", f ) ;  
  }  
}  

Output

The String value using printf():  Hello word  
 The Integer value using printf() : i = 45 
 The float value using printf() : 8.456000 
 Formating the float value to a specific decimal: f = 8.4560
 Formating the float value to two decimal: f = 8.46
 Formating the float value right margin : n = 8.4560

printf( ) system.out.format() can also be utilised.

It's vital to remember that, unlike the printf() method, System.out.print() and System.out.println() only accept one parameter.

Output Formatting Using the Decimal Format class

We use the Decimal format class to format the decimal numbers in Java.

import java.text.DecimalFormat ;  
// Importing the Decimal format class    
public class JavaCallable 
{  
  public static void main( String args[ ] )  
  {  
    double num = 987.65432 ;  
    // Displaying the number initialised in the console   
    System.out.printf( " 
 Double number taken is : %f 
 ", num ) ;      
    // Displaying only the integral part of the double number using decimal format   
    DecimalFormat obj = new DecimalFormat( " #### " ) ;  
    System.out.println( " 
 Without fraction part the number is : " + obj.format( num ) ) ;  
    // Displaying only up to the two decimals of the double number using decimal format
    obj = new DecimalFormat( " #.## " ) ;  
    System.out.println( " 
 Double number up to two decimal places is = " + obj.format( num ) ) ;  
    // appending zero to the decimal number on the right side as specified, instead of #, we use the digit 0  
    obj = new DecimalFormat( " #.000000 " ) ;  
    System.out.println( " 
 Adding zeros to the right part of the double number = " + obj.format( num ) ) ;  
    // appending zero to the decimal number on the left side as specified, instead of #, we use the digit 0   
    obj = new DecimalFormat( " 00000.00 " ) ;  
    System.out.println( " 
 Adding zeros to the right part of the double number = "+ obj.format( num ) ) ;  


    // converting rs into dollars using decimal format class  


    double money = 550000.789 ;  


    obj = new DecimalFormat( " $###,###.## "  ) ;  


    System.out.println( " 
 Money after converting in to dollars : " + obj.format( money ) ) ;  


  }  


}  

Output

Double number taken is : 987.654320 
 Without fraction part the number is :  988
 Double number up to two decimal places is =  987.65
 Adding zeros to the right part of the double number =  987.654320
 Adding zeros to the right part of the double number =  00987.65
 Money after converting in to dollars :  $550,000.79