What is system out format in java

What is the use of system out format in Java?

System. out. printf() method can be used to print formatted output in java.

Why do we use system out format in java?

Earlier you saw the use of the print and println methods for printing strings to standard output ( System. out ). Since all numbers can be converted to strings (as you will see later in this lesson), you can use these methods to print out an arbitrary mixture of strings and numbers.

What is the use of system out printf in java?

The System. out. printf() function in Java allows users to print formatted data.

How do you format a system in java?

The format() method of java language is like sprintf() function in c language and printf() method of java language.
…
Java String Format Specifiers.

Format Specifier	Data Type	Output
%n	none	Platform-specific line separator.
%o	integer (incl. byte, short, int, long, bigint)	Octal number
%s	any type	String value

What does %s mean in Java?

Format Specifiers in Java

Format Specifier	Conversion Applied
%s %S	String
%n	Inserts a newline character
%o	Octal integer
%f	Decimal floating-point

What is the use of t in Java?

What does t mean in Java? This means to insert a new tab at this specific point in the text. In the below example, “t” is used inside the println statement. It is similar to pressing the tab on our keyboard.

Can we override static method?

Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).

Can we override main method in Java?

No, we cannot override main method of java because a static method cannot be overridden. … So, whenever we try to execute the derived class static method, it will automatically execute the base class static method. Therefore, it is not possible to override the main method in java.

What does %n do in Java?

By using %n in your format string, you tell Java to use the value returned by System. getProperty(“line. separator”) , which is the line separator for the current system.

Is printf used in Java?

Java printf() printf() method is not only there in C, but also in Java. This method belongs to the PrintStream class. It’s used to print formatted strings using various format specifiers.

What is printf () in Java?

The printf() method of Java PrintStream class is a convenience method which is used to write a String which is formatted to this output Stream. It uses the specified format string and arguments to write the string.

What is system in Java?

System.in in java means to take input from the keyboard or user. System. out in java means to print the output to console.

What is locale in Java?

A Locale object represents a specific geographical, political, or cultural region. An operation that requires a Locale to perform its task is called locale-sensitive and uses the Locale to tailor information for the user.

How do you set decimal places in Java?

Syntax: String. format(“%. Df”, decimalValue); where D is the number required number of Decimal places.

What is DecimalFormat import Java?

The java. text. DecimalFormat class is used to format numbers using a formatting pattern you specify yourself. This text explains how to use the DecimalFormat class to format different types of numbers.

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Formatting Numeric Print Output

Earlier you saw the use of the print and println methods for printing strings to standard output ( System.out ). Since all numbers can be converted to strings (as you will see later in this lesson), you can use these methods to print out an arbitrary mixture of strings and numbers. The Java programming language has other methods, however, that allow you to exercise much more control over your print output when numbers are included.

The printf and format Methods

The java.io package includes a PrintStream class that has two formatting methods that you can use to replace print and println . These methods, format and printf , are equivalent to one another. The familiar System.out that you have been using happens to be a PrintStream object, so you can invoke PrintStream methods on System.out . Thus, you can use format or printf anywhere in your code where you have previously been using print or println . For example,

The syntax for these two java.io.PrintStream methods is the same:

public PrintStream format(String format, Object. args)

where format is a string that specifies the formatting to be used and args is a list of the variables to be printed using that formatting. A simple example would be

System.out.format("The value of " + "the float variable is " + "%f, while the value of the " + "integer variable is %d, " + "and the string is %s", floatVar, intVar, stringVar);

The first parameter, format , is a format string specifying how the objects in the second parameter, args , are to be formatted. The format string contains plain text as well as format specifiers, which are special characters that format the arguments of Object. args . (The notation Object. args is called varargs, which means that the number of arguments may vary.)

Format specifiers begin with a percent sign (%) and end with a converter. The converter is a character indicating the type of argument to be formatted. In between the percent sign (%) and the converter you can have optional flags and specifiers. There are many converters, flags, and specifiers, which are documented in java.util.Formatter

int i = 461012; System.out.format("The value of i is: %d%n", i);

The %d specifies that the single variable is a decimal integer. The %n is a platform-independent newline character. The output is:

The printf and format methods are overloaded. Each has a version with the following syntax:

public PrintStream format(Locale l, String format, Object. args)

To print numbers in the French system (where a comma is used in place of the decimal place in the English representation of floating point numbers), for example, you would use:

System.out.format(Locale.FRANCE, "The value of the float " + "variable is %f, while the " + "value of the integer variable " + "is %d, and the string is %s%n", floatVar, intVar, stringVar);

An Example

The following table lists some of the converters and flags that are used in the sample program, TestFormat.java , that follows the table.

Converters and Flags Used in TestFormat.java

Converter	Flag	Explanation
d	A decimal integer.
f	A float.
n	A new line character appropriate to the platform running the application. You should always use %n , rather than \n .
tB	A date & time conversion—locale-specific full name of month.
td, te	A date & time conversion—2-digit day of month. td has leading zeroes as needed, te does not.
ty, tY	A date & time conversion—ty = 2-digit year, tY = 4-digit year.
tl	A date & time conversion—hour in 12-hour clock.
tM	A date & time conversion—minutes in 2 digits, with leading zeroes as necessary.
tp	A date & time conversion—locale-specific am/pm (lower case).
tm	A date & time conversion—months in 2 digits, with leading zeroes as necessary.
tD	A date & time conversion—date as %tm%td%ty
08	Eight characters in width, with leading zeroes as necessary.
+	Includes sign, whether positive or negative.
,	Includes locale-specific grouping characters.
—	Left-justified..
.3	Three places after decimal point.
10.3	Ten characters in width, right justified, with three places after decimal point.

The following program shows some of the formatting that you can do with format . The output is shown within double quotes in the embedded comment:

import java.util.Calendar; import java.util.Locale; public class TestFormat < public static void main(String[] args) < long n = 461012; System.out.format("%d%n", n); // -->"461012" System.out.format("%08d%n", n); // --> "00461012" System.out.format("%+8d%n", n); // --> " +461012" System.out.format("%,8d%n", n); // --> " 461,012" System.out.format("%+,8d%n%n", n); // --> "+461,012" double pi = Math.PI; System.out.format("%f%n", pi); // --> "3.141593" System.out.format("%.3f%n", pi); // --> "3.142" System.out.format("%10.3f%n", pi); // --> " 3.142" System.out.format("%-10.3f%n", pi); // --> "3.142" System.out.format(Locale.FRANCE, "%-10.4f%n%n", pi); // --> "3,1416" Calendar c = Calendar.getInstance(); System.out.format("%tB %te, %tY%n", c, c, c); // --> "May 29, 2006" System.out.format("%tl:%tM %tp%n", c, c, c); // --> "2:34 am" System.out.format("%tD%n", c); // --> "05/29/06" > >

Note: The discussion in this section covers just the basics of the format and printf methods. Further detail can be found in the Basic I/O section of the Essential trail, in the «Formatting» page.
Using String.format to create strings is covered in Strings.

The DecimalFormat Class

You can use the java.text.DecimalFormat class to control the display of leading and trailing zeros, prefixes and suffixes, grouping (thousands) separators, and the decimal separator. DecimalFormat offers a great deal of flexibility in the formatting of numbers, but it can make your code more complex.

The example that follows creates a DecimalFormat object, myFormatter , by passing a pattern string to the DecimalFormat constructor. The format() method, which DecimalFormat inherits from NumberFormat , is then invoked by myFormatter —it accepts a double value as an argument and returns the formatted number in a string:

Here is a sample program that illustrates the use of DecimalFormat :

import java.text.*; public class DecimalFormatDemo < static public void customFormat(String pattern, double value ) < DecimalFormat myFormatter = new DecimalFormat(pattern); String output = myFormatter.format(value); System.out.println(value + " " + pattern + " " + output); >static public void main(String[] args) < customFormat("###,###.###", 123456.789); customFormat("###.##", 123456.789); customFormat("000000.000", 123.78); customFormat("$###,###.###", 12345.67); >>

123456.789 ###,###.### 123,456.789 123456.789 ###.## 123456.79 123.78 000000.000 000123.780 12345.67 $###,###.### $12,345.67

The following table explains each line of output.

DecimalFormat.java Output

Value	Pattern	Output	Explanation
123456.789	###,###.###	123,456.789	The pound sign (#) denotes a digit, the comma is a placeholder for the grouping separator, and the period is a placeholder for the decimal separator.
123456.789	###.##	123456.79	The value has three digits to the right of the decimal point, but the pattern has only two. The format method handles this by rounding up.
123.78	000000.000	000123.780	The pattern specifies leading and trailing zeros, because the 0 character is used instead of the pound sign (#).
12345.67	$###,###.###	$12,345.67	The first character in the pattern is the dollar sign ($). Note that it immediately precedes the leftmost digit in the formatted output .

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The printf and format Methods System. out. The first parameter, format , is a format string specifying how the objects in the second parameter, args , are to be formatted. The format string contains plain text as well as format specifiers, which are special characters that format the arguments of Object… args .

How do you write system out Println?

What is system out printf?

System.out.printf(“The String object %s is at hash code %h%n”, s, s); String class format( ) method: You can build a formatted String and assign it to a variable using the static format method in the String class. The use of a format string and argument list is identical to its use in the printf method.

Why printf is used in java?

The printf() method of Java PrintStream class is a convenience method which is used to write a String which is formatted to this output Stream. It uses the specified format string and arguments to write the string.

What does System out Println () do?

System. out. println is a Java statement that prints the argument passed, into the System. out which is generally stdout.

Is System out an object?

The textbook states that to use the out object in the System class, you must refer it as System. out but later in the book it states that the System. out belongs to class PrintStream.

What method is used to format output?

String provides format() method can be used to print formatted output in java.

What is %d called?

% notation is called a format specifier. For example, %d tells printf() to print an integer.

How to print string in system.out.format?

How does System.out.println work in Java?

How to print formatted text output in Java?

What does println ( ) do in PrintStream class?

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