How to use show in java

The show method in Java is used to output data to the console or other output devices. It supports two usages: without format specifier, the output object toString() method returns the value; using format specifier, controls the output format, such as %s represents a string and %d represents an integer. The show method does not wrap lines automatically, and you need to add \n characters manually.

Usage of show in Java

The show method in Java is used to output data to the console or other of the output device. It is widely used in various scenarios such as debugging, logging, and displaying results on the screen.

Syntax

<code class="java">public static void show(Object obj, [FormatSpecifiers])</code>

Parameters

• obj - The object to be displayed
• FormatSpecifiers - Optional format specifiers used to control the format of the output

Return type

None

Usage

The show method can be used in two ways:

1. Unformatted specifier

   If no format specifier is specified, the show method will simply print the return value of the object's toString() method. For example:

   <code class="java">Employee employee = new Employee("John Doe", 30);
   show(employee); // 输出 "Employee[name=John Doe, age=30]"</code>

2. Using format specifiers

   Use format specifiers to control the format of the output. Format specifiers begin with a percent sign (%), followed by a letter indicating the format to be applied. For example:

   • %s - string
   • %d - integer
   • %f - Floating point number
   • %t - Date or time

   <code class="java">Employee employee = new Employee("John Doe", 30);
   show(employee, "%s, %d"); // 输出 "John Doe, 30"</code>

Notes

• The show method does not wrap lines automatically. If line breaks are required, \n characters need to be added manually.
• The show method uses System.out as the default output device. Other output devices can be specified, such as files or network connections.
• show method is thread-safe.

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