Ponekad želimo da se izlaz programa ispiše u određenom formatu. U programskom jeziku C to je moguće pomoću funkcije printf(). U ovom odjeljku raspravljat ćemo o različitim izlaznim formatima.

Raspravljajmo o tome kako možemo formatirati izlaz u Javi.

Postoje dvije metode koje se mogu koristiti za formatiranje izlaza u Javi:

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• Korištenje metode printf().
• Korištenje metode format( ).

Formatiranje izlaza korištenjem metode System.out.printf( ).

Implementacija ove metode je vrlo jednostavna jer je slična funkciji printf() u C programiranju.

FormattedOutput1.java

 public class FormattedOutput1 { public static void main( String args[ ] ) { // printing the string value on the console String str = ' JavaTpoint ' ; System.out.printf( ' 
 Printing the String value : %s 
 ', str ) ; // printing the integer value on the console int x = 512 ; System.out.printf( ' 
 Printing the integer value : x = %d 
 ', x ) ; // printing the decimal value on the console float f = 5.25412368f ; System.out.printf( ' 
 Printing the decimal value : %f 
 ', f ) ; // this formatting is used to specify the width un to which the digits can extend System.out.printf( ' 
 Formatting the output to specific width : n = %.4f 
 ', f ) ; // this formatting will print it up to 2 decimal places System.out.printf( ' 
 Formatted the output with precision : PI = %.2f 
 ', f ) ; // here number is formatted from right margin and occupies a width of 20 characters System.out.printf( ' 
 Formatted to right margin : n = %20.4f 
 ', f ) ; } } 

Izlaz:

 Printing the String value : JavaTpoint Printing the integer value : x = 512 Printing the decimal value : 5.254124 Formatting the output to specific width : n = 5.2541 Formatted the output with precision : PI = 5.25 Formatted to right margin : n = 5.2541 

System.out.format() je ekvivalentan printf() i također se može koristiti.

Važno je napomenuti da System.out.print() i System.out.println() uzimaju jedan argument, ali printf() metoda može prihvatiti više argumenata.

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Formatiranje pomoću klase DecimalFormat:

DecimalFormat se koristi za formatiranje decimalnih brojeva.

FormattedOutput2.java

 import java.text.DecimalFormat ; // definition of the class public class FormattedOutput2 { public static void main( String args[ ] ) { double x = 123.4567 ; // printing the number System.out.printf( ' 
 The number is : %f 
 ', x ) ; // printing only the numeric part of the floating number DecimalFormat ft = new DecimalFormat( ' #### ' ) ; System.out.println( ' 
 Without fraction part the number is : ' + ft.format( x ) ) ; // printing the number only upto 2 decimal places ft = new DecimalFormat( ' #.## ' ) ; System.out.println( ' 
 Formatted number with the specified precision is = ' + ft.format( x ) ) ; // automatically appends zero to the rightmost part of decimal, instead of #, we use digit 0 ft = new DecimalFormat( ' #.000000 ' ) ; System.out.println( ' 
 Appending the zeroes to the right of the number = ' + ft.format( x ) ) ; // automatically appends zero to the leftmost of decimal number instead of #, we use digit 0 ft = new DecimalFormat( ' 00000.00 ' ) ; System.out.println( ' 
 Appending the zeroes to the left of the number = '+ ft.format( x ) ) ; // formatting money in dollars double income = 550000.789 ; ft = new DecimalFormat( ' $###,###.## ' ) ; System.out.println( ' 
 Your Formatted Income in Dollars : ' + ft.format( income ) ) ; } } 

Izlaz:

 The number is : 123.456700 Without fraction part the number is : 123 Formatted number with the specified precision is = 123.46 Appending the zeroes to the right of the number = 123.456700 Appending the zeroes to the left of the number = 00123.46 Your Formatted Income in Dollars : 0,000.79 

Java Specifikatori formata niza

Ovdje pružamo tablicu specifikacija formata koje podržava Java String.

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