How To Format String Inward Coffee – String Format Example
String format as well as printf Example
How to format String inward Java is most mutual occupation developer come across because of classic System.out.println() doesn’t back upward formatting of String while printing on console. For those who doesn’t know What is formatted String? hither is a elementary definition, Formatted String is a String which non exclusively displays contents but besides displays it inward a format which is widely accepted similar including comma spell displaying large numbers e.g. 100,000,000 etc. Displaying formatted String is i of the needs for modern GUI application as well as thankfully Java has expert back upward for formatting String as well as all other types like Integers, Double, as well as Date. How to format a String inward Java is never equally slow equally it has been since Java 1.5 which along amongst front end line features similar Generics, Enum, Autoboxing as well as Varargs also innovate several utility methods to back upward rich formatting of String inward Java.
Prior to Java v coffee programmer relies on java.text API for all their formatting request but amongst Java v nosotros receive got forthwith 2 to a greater extent than convenient agency to format String inward Java. JDK 1.5 has added format() method inward java.lang.String class as well as provided a printf() method inward PrintStream class for printing formatted output inward the console.
The printf() method is similar to C programming linguistic communication printf() method as well as allows a programmer to impress formatting string straight to console, which makes System.out.printf() better alternative to System.out.println() method. Both format() and printf() are overloaded method to support Locale specific formatting.
Prior to Java v coffee programmer relies on java.text API for all their formatting request but amongst Java v nosotros receive got forthwith 2 to a greater extent than convenient agency to format String inward Java. JDK 1.5 has added format() method inward java.lang.String class as well as provided a printf() method inward PrintStream class for printing formatted output inward the console.
The printf() method is similar to C programming linguistic communication printf() method as well as allows a programmer to impress formatting string straight to console, which makes System.out.printf() better alternative to System.out.println() method. Both format() and printf() are overloaded method to support Locale specific formatting.
By the way, this is the 3rd article almost formatting inward Java, before nosotros receive got seen Decimal Format examples as well as DateFormat examples for formatting numbers as well as dates inward Java.
How String.format()or printf()works inward Java
String.format "%[argument number] [flags] [width] [.precision] type"
Now let's reckon what is the pregnant of each business office of formatting instruction. "%" is a special graphic symbol inward formatted String as well as it denotes the start of formatting instruction. String.format() can back upward multiple formatting instructions amongst multiple occurrences of "%" graphic symbol inward formatting instruction.
"argument number" is used to specify right declaration inward instance multiple arguments are available for formatting. "flags" is some other special formatting didactics which is used to impress String inward some specific format for instance y'all tin utilization flag equally "," to impress comma on output. "width" formatting pick denotes minimum position out or graphic symbol volition locomote used inward output but inward instance if position out is larger than width as well as hence total position out volition locomote displayed but if it's smaller inward length as well as hence it volition locomote padded amongst zero.
The "precision" is using for impress floating signal formatted String, past times using precision y'all tin specify how many decimals a floating signal position out volition locomote displayed inward formatted String. "type" is the exclusively mandatory formatting pick as well as must ever come upward concluding inward format String besides input String which needs to locomote formatted must locomote amongst the same type specified inward "type" parameter.
For example, y'all tin non input a floating signal position out if y'all receive got specified "type" equally decimal integer "%d", that volition trial inward an error. Now let's reckon an instance of a String format() method to empathise these formatting options better:
The "precision" is using for impress floating signal formatted String, past times using precision y'all tin specify how many decimals a floating signal position out volition locomote displayed inward formatted String. "type" is the exclusively mandatory formatting pick as well as must ever come upward concluding inward format String besides input String which needs to locomote formatted must locomote amongst the same type specified inward "type" parameter.
For example, y'all tin non input a floating signal position out if y'all receive got specified "type" equally decimal integer "%d", that volition trial inward an error. Now let's reckon an instance of a String format() method to empathise these formatting options better:
format ( "%,6.2f", 124.000)
In higher upward instance of String.format() method flag is a comma ",", width is half dozen as well as precision are upward to 2 decimal signal as well as type is a float.
String format Example inward Java
In this section, nosotros volition reckon dissimilar examples to format String inward Java. We volition reckon how nosotros tin format numbers as well as dates. Introduce decimal points as well as aligning position out left or right etc. One of the mutual application of format() is to impress leading null inward a position out equally shown inward this Java plan example:
/**
* Java plan to demonstrate How to format String inward Java past times using
* Java plan to demonstrate How to format String inward Java past times using
* format() method of String class as well as printf() method of OutputStream inward Java.
* String.format() is really powerful as well as non exclusively tin format String but numbers
* String.format() is really powerful as well as non exclusively tin format String but numbers
* as well as Date inward Java
*
* @author Javin
*/
public class StringFormatExample{
public static void main(String args[]){
//simple instance of formatted string inward Java
*
* @author Javin
*/
public class StringFormatExample{
public static void main(String args[]){
//simple instance of formatted string inward Java
//%d is used to format decimals similar integers
//position of declaration is the club inward which they look inward origin String
e.g hither 40021 volition supercede the starting fourth dimension %d as well as 3000 volition supercede the minute %d.
String formattedString = String.format("Order amongst OrdId : %d as well as Amount: %d is missing", 40021, 3000);
String formattedString = String.format("Order amongst OrdId : %d as well as Amount: %d is missing", 40021, 3000);
System.out.println(formattedString);
System.out.printf("Order amongst OrdId : %d and Amount: %d is missing \n", 40021, 3000);
//%s is used to announce String arguments inward formatted String
String str = String.format("Hello %s", "Raj");
System.out.println(str);
//if declaration is non convertible into specified information type than
System.out.printf("Order amongst OrdId : %d and Amount: %d is missing \n", 40021, 3000);
//%s is used to announce String arguments inward formatted String
String str = String.format("Hello %s", "Raj");
System.out.println(str);
//if declaration is non convertible into specified information type than
//Formatter volition throw next java.util.IllegalFormatConversionException
//e.g. specifying %d as well as passing 3.0
//str = String.format("Number %d", 3.0);
// Exception inward thread "main" java.util.IllegalFormatConversionException: d != java.lang.Double
// at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:3999)
// at java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2709)
// at java.util.Formatter$FormatSpecifier.print(Formatter.java:2661)
// at java.util.Formatter.format(Formatter.java:2433)
// at java.util.Formatter.format(Formatter.java:2367)
// at java.lang.String.format(String.java:2769)
//common meta characters used inward String.format() as well as
//e.g. specifying %d as well as passing 3.0
//str = String.format("Number %d", 3.0);
// Exception inward thread "main" java.util.IllegalFormatConversionException: d != java.lang.Double
// at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:3999)
// at java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2709)
// at java.util.Formatter$FormatSpecifier.print(Formatter.java:2661)
// at java.util.Formatter.format(Formatter.java:2433)
// at java.util.Formatter.format(Formatter.java:2367)
// at java.lang.String.format(String.java:2769)
//common meta characters used inward String.format() as well as
//System.out.printf() method: %s - String , %d - decimal integer
// %f - float %tD - appointment equally MM/dd/yy spell %td is twenty-four hours %tm is month
// %f - float %tD - appointment equally MM/dd/yy spell %td is twenty-four hours %tm is month
// as well as %ty is 2 digit twelvemonth spell %tY is 4 digit year
//Formatting appointment inward String format method - appointment inward MM/dd/yy
str = String.format("Today is %tD", new Date());
System.out.println(str);
Date today = new Date();
System.out.printf("Date inward dd/mm/yy format %td/%tm/%ty %n", today,today,today );
// appointment equally July 25, 2012, deviation betwixt %td as well as %te is that
//Formatting appointment inward String format method - appointment inward MM/dd/yy
str = String.format("Today is %tD", new Date());
System.out.println(str);
Date today = new Date();
System.out.printf("Date inward dd/mm/yy format %td/%tm/%ty %n", today,today,today );
// appointment equally July 25, 2012, deviation betwixt %td as well as %te is that
// %td utilization leading null spell %te doesn't
System.out.printf("Today is %tB %te, %tY %n", today,today,today,today);
//adding leading null inward numbers using String format,
System.out.printf("Today is %tB %te, %tY %n", today,today,today,today);
//adding leading null inward numbers using String format,
//%d is for decimal, 8 specify formatted position out should locomote 8 digits as well as 0 specify use
//leading zero, default is space, hence if y'all don't specify leading
//leading zero, default is space, hence if y'all don't specify leading
// graphic symbol infinite volition locomote used.
System.out.printf("Amount : %08d %n" , 221);
//printing positive as well as negative position out using String format
System.out.printf("Amount : %08d %n" , 221);
//printing positive as well as negative position out using String format
//+ sign for positive, - for negative as well as %n is for novel line
System.out.printf("positive position out : +%d %n", 1534632142);
System.out.printf("negative position out : -%d %n", 989899);
//printing floating signal position out amongst System.format()
System.out.printf("%f %n", Math.E);
//3 digit later decimal point
System.out.printf("%.3f %n", Math.E);
//8 charcter inward width as well as three digit later decimal point
System.out.printf("%8.3f %n", Math.E);
//adding comma into long numbers
System.out.printf("Total %,d messages processed today", 10000000);
}
}
Output:
Order amongst OrdId: 40021 and Amount: 3000 is missing
Order amongst OrdId: 40021 and Amount: 3000 is missing
Hello Raj
Today is 07/25/12
Date inward dd/mm/yy format 25/07/12
Today is July 25, 2012
Amount: 00000221
positive number: +1534632142
negative position out : -989899n
2.718282
2.718
2.718
Total 10,000,000 messages processed today
System.out.printf("positive position out : +%d %n", 1534632142);
System.out.printf("negative position out : -%d %n", 989899);
//printing floating signal position out amongst System.format()
System.out.printf("%f %n", Math.E);
//3 digit later decimal point
System.out.printf("%.3f %n", Math.E);
//8 charcter inward width as well as three digit later decimal point
System.out.printf("%8.3f %n", Math.E);
//adding comma into long numbers
System.out.printf("Total %,d messages processed today", 10000000);
}
}
Output:
Order amongst OrdId: 40021 and Amount: 3000 is missing
Order amongst OrdId: 40021 and Amount: 3000 is missing
Hello Raj
Today is 07/25/12
Date inward dd/mm/yy format 25/07/12
Today is July 25, 2012
Amount: 00000221
positive number: +1534632142
negative position out : -989899n
2.718282
2.718
2.718
Total 10,000,000 messages processed today
Difference betwixt the printf as well as format methods inward Java
printf() and format()both methods are used to format inward Java as well as to a greater extent than or less similar. printf()is to a greater extent than roughly C programming linguistic communication because of the identical cite used in C programming language, Anyone who has locomote inward C previously tin easily start amongst this printf() method besides its await to a greater extent than equally a replacement of System.out.println().
if y'all don't desire to impress simply desire a formatted string for whatever other role String format() method is a agency to go. In summary, y'all tin say that printf()writes to stdout spell format() return y'all a formatted string.
if y'all don't desire to impress simply desire a formatted string for whatever other role String format() method is a agency to go. In summary, y'all tin say that printf()writes to stdout spell format() return y'all a formatted string.
We receive got already seen String format examples amongst both format as well as printf method. In short, formatting is easier inward Java as well as it provides several classes similar DateFormat, NumberFormat etc which tin besides locomote used to format Date as well as numbers.
Further Learning
Data Structures as well as Algorithms: Deep Dive Using Java
How substring industrial plant inward Java
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