Format Specifier

In this chapter you will learn:

1. What are the specifiers for Java Formatter class

Format specifier in details

The format() method accepts a wide variety of format specifiers. When an uppercase specifier is used, then letters are shown in uppercase. Otherwise, the upper- and lowercase specifiers perform the same conversion. The following table shows the format specifiers:

If the argument doesn't match the type-checks, an IllegalFormatException is thrown.

import java.util.Formatter;
// ja  v  a  2  s  .c om
public class Main {
  public static void main(String args[]) {
    Formatter fmt = new Formatter();
    fmt.format("%s gap filler %d %f", "Astring", 10, 12.3); 
    System.out.println(fmt.toString());
    System.out.println(fmt); 
  }
}

The output:

You can obtain a reference to the underlying output buffer by calling out(). It returns a reference to an Appendable object.

Next chapter...

What you will learn in the next chapter:

1. How to format individual character and how to format string
2. How to pass in two strings into the format string

String

    Java String type

    Java String Concatenation

    Java String Creation

    Java String Compare

    Java String Search

    Java String and char array

    Java String Conversion

    String trim, length, is empty, and substring

    String replace

StringBuffer

    StringBuffer class

    StringBuffer Insert and Append

    StringBuffer length and capacity

    StringBuffer char operation

    StringBuffer Operations

    Search within StringBuffer

    StringBuffer to String

StringBuilder

    StringBuilder

    StringBuilder insert and append

    StringBuilder length and capacity

    StringBuilder get,delete,set char

    StringBuilder delete, reverse

    StringBuilder search with indexOf and lastIndexOf

    StringBuilder to String

String Format

    Formatter class

    Format Specifier

    Format String and characters

    Format integer value

    Format decimal

    Scientific notation format

    Format octal and hexadecimal value

    Format date and time value

    Escape Formatter

    Minimum Field Width

    Specifying Precision

    Format Flags

    Uppercase Option

    Formatter Argument Index

    Align left and right

    Left and right padding a string

String Format Utilities

    Abbreviate string

    Caplitalize a string

    Uncapitalize a string

    Utility class for right padding

    Left padding

    Centers a String

    Transforms words