Learn Java Tutorial for Beginners, Part 24: StringBuilder and String Formatting

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In this video by Quordnet Academy for the series Learn Java Tutorial for Beginners how to use and what is StringBuilder and String Formatting have been discussed.
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The 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.

Signature:
There are two type of string format() method:
public static String format(Locale loc, String form, Object… args)
and,
public static String format(String form, Object… args)
Parameter:
loc– locale value to be applied on the format() method
form– format of the output string
args– It specifies the number of arguments for the format string.It may be zero or more.
Return:
This method returns a formatted string.
Exception:
NullPointerException -If the format is null.
IllegalFormatException -If the format specified is illegal or there are insufficient arguments.

Example:To show working of format() method
// Java program to demonstrate
// working of format() method

class Gfg1 {
public static void main(String args[])
{
String str = "GeeksforGeeks.";

// Concatenation of two strings

// Output is given upto 8 decimal places

// between "My answer is" and "47.65734000" there are 15 spaces

}
}
Output:
My Company name is GeeksforGeeks.
My answer is 47.65734000
My answer is 47.65734000

// Java program to demonstrate
// concatenation of arguments to the string
// using format() method

class Gfg2 {
public static void main(String args[])
{
String str1 = "GFG";
String str2 = "GeeksforGeeks";

//%1$ represents first argument, %2$ second argument
" is: %1$s, %1$s and %2$s", str1, str2);

}
}
Output:
My Company name is: GFG, GFG and GeeksforGeeks

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