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Java String format() Method With Examples

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In Java, String format() method returns a formatted string using the given locale, specified format string, and arguments. We can concatenate the strings using this method and at the same time, we can format the output concatenated string.

Syntax of String format()

There are two types of string format() methods mentioned below:

public static String format(Locale loc, String form, Object... args)
public static String format(String form, Object... args)

Parameters

locale: the locale value to be applied on the format() method
format: The format of the output string.
args: args specifying the number of arguments for the format string. It may be zero or more.

Return Value

  • Formatted string. 

Exception Thrown

Example of Java String format()

Java




// Java program to demonstrate
// working of format() method
 
// Main class
class GFG {
    // Main driver method
    public static void main(String args[])
    {
        // Custom input string to be formatted
        String str = "GeeksforGeeks";
 
        // Concatenation of two strings
        String s
            = String.format("My Company name is %s", str);
 
        // Output is given upto 8 decimal places
        String str2
            = String.format("My answer is %.8f", 47.65734);
 
        // Here answer is supposed to be %15.8f" and
        // "47.65734000" there are 15 spaces
        String str3 = String.format("My answer is %15.8f",
                                    47.65734);
 
        // Print and display strings
        System.out.println(s);
        System.out.println(str2);
        System.out.println(str3);
    }
}


Output

My Company name is GeeksforGeeks
My answer is 47.65734000
My answer is     47.65734000

Java Format Specifiers

Format Specifier

Data Type Output or Return value

%a

floating point                        Returns a Hex output of floating point number

%b

Any type True or False

%c

character Unicode character

%d

integer  Decimal Integer

%e

floating point a decimal number in scientific notation

%f

floating point decimal number

%g

floating point decimal number, possibly in scientific notation depending on the precision and value    

%h

Any type Hex String of value from hashCode() method

%n

None Platform-specific line separator

%o

integer  Octal number

%s

Any type String value

%t

Date/Time  %t is the prefix for Date/Time conversions.

%x

integer Hex string

Examples of Java String Format Specifiers

Example 1

Java




// Java program to demonstrate Concatenation of Arguments
// to the string using format() method
 
// Main class
class GFG {
    // Main driver method
    public static void main(String args[])
    {
        // Custom input string to be formatted
        String str1 = "GFG";
        String str2 = "GeeksforGeeks";
 
        // %1$ represents first argument
        // %2$ second argument
        String str = String.format(
            "My Company name"
                + " is: %1$s, %1$s and %2$s",
            str1, str2);
 
        // Print and display the formatted string
        System.out.println(str);
    }
}


Output

My Company name is: GFG, GFG and GeeksforGeeks

Example 2

Java




// Java program to Illustrate Left Padding
// using format() method
 
// Main class
class GFG {
    // Main driver method
    public static void main(String args[])
    {
        // Custom integer number
        int num = 7044;
 
        // Output is 3 zero's("000") + "7044",
        // in total 7 digits
        String str = String.format("%07d", num);
 
        // Print and display the formatted string
        System.out.println(str);
    }
}


Output

0007044


Last Updated : 04 Jun, 2023
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