系统类console()方法 (System class console() method)

• console() method is available in java.lang package.

  console()方法在java.lang包中可用。

• console() method is used to return the console object which is uniquely associated with the current JVM(Java Virtual Machine) if exists.

  如果存在，则使用console()方法返回与当前JVM(Java虚拟机)唯一关联的控制台对象。

• console() method is static, it is accessible with the class name too.

  console()方法是静态的，也可以使用类名进行访问。

• console() method does not throw any exception.

  console()方法不会引发任何异常。

Syntax:

句法：

    public static Console console();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is Console, it returns the Console object if exists else it returns null when none of the System console exists.

此方法的返回类型为Console ，如果存在则返回Console对象，否则在不存在任何系统控制台时返回null。

Example:

例：

// Java program to demonstrate the example of
// console() method of System Class.
import java.io.*;
public class ConsoleMethod {public static void main(String[] args) {// Creating an object of Console
Console con = System.console();
if (con == null)
// Display when console is null
System.out.println("Null Console");
else {String str = con.readLine("%s", "Java Programming");
// Display when console is not null
System.out.println("The value of str is :" + str);
}
}
}

Output

输出量

E:\Programs>javac ConsoleMethod.java
E:\Programs>java ConsoleMethod
Null Console

翻译自: https://www.includehelp.com/java/system-class-console-method-with-example.aspx