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How to use String.format() in Java?
The format() method of the java.lang.String class accepts a format string and an array of arguments and the string in specified format.
Example
Following example formats a date using the format() method −
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Test {
public static void main(String args[]){
//Instantiating the GregorianCalendar
Calendar cal = GregorianCalendar.getInstance();
System.out.println("Date: "+cal.get(Calendar.DATE));
System.out.println("Month: "+cal.get(Calendar.MONTH));
System.out.println("Year: "+cal.get(Calendar.YEAR));
Object arr[] = { "Date", cal };
System.out.println("Desired Format: ");
System.out.println(String.format("%1$s = %2$tY %2$tm %2$te", arr));
}
}Output
Date: 7 Month: 10 Year: 2020 Desired Format: Date = 2020 11 7
Example
In the following example we are trying to print an integer with additional zeros using the format() method.
public class Demo {
public static void main(String []args){
int val = 1254;
String str = String.format("%07d", val);
System.out.println(str);
}
}Output
0001254
Example
Following example demonstrates the format strings for all the data types −
public class Demo {
public static void main(String []args){
String str = String.format("%d", 245);
System.out.println(str);
str = String.format("%s", "Welcome to Tutorialspoint");
System.out.println(str);
str = String.format("%f", 126.54);
System.out.println(str);
str = String.format("%c", 't');
System.out.println(str);
}
}Output
245 Welcome to Tutorialspoint 126.540000 t
Updated on: 06-Feb-2021
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