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How to Format Strings in Java

String formatting is the process of modifying the output of a string to a specific format, like placeholders for variables, text alignment, and formatting numerical values. The following are the methods in Java using the format() method, which allows for a more accurate approach to presenting values in the output.

The string format() method method allows for formatting strings, integers, and decimal values using different format specifiers. This method returns a formatted string based on the specified locale, formatter, and arguments, and if no locale is given, the default is used. The String.format() is a static method of the Java String class.

The following is the syntax for Java String format() method

public static String format(Locale l, String format, Object... args) //first syntax
public static String format(String format, Object... args) // second syntax

The following example returns a formatted string value using a specific locale, format, and arguments in the format() method

import java.util.*;

public class StringFormat{
   public static void main(String[] args){
      double e = Math.E;
      System.out.format("%f%n", e);
      System.out.format(Locale.GERMANY, "%-10.4f%n%n", e);
   }
}

2.718282
2,7183   

The following is another example of format strings

public class HelloWorld {
   public static void main(String []args) {
      String name = "Hello World";
      String s1 = String.format("name %s", name);
      String s2 = String.format("value %f",32.33434);
      String s3 = String.format("value %32.12f",32.33434);
      System.out.print(s1);
      System.out.print("\n");
      System.out.print(s2);
      System.out.print("\n");
      System.out.print(s3);
      System.out.print("\n");
   }
}

name Hello World
value 32.334340
value                  32.334340000000        

java_strings.htm

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