system.setin

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

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

  setIn()方法在java.lang包中可用。

• setIn() method is used to assign again the standard input stream.

  setIn()方法用于再次分配标准输入流。

• setIn() method is redirected because it does not read the input from the editor.

  setIn()方法被重定向，因为它不从编辑器读取输入。

• setIn() method read the input from the standard input stream.

  setIn()方法从标准输入流中读取输入。

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

  setIn()方法是静态方法，也可以使用类名进行访问。

• setIn() method may throw an exception while reading the input from the standard input stream:

  从标准输入流中读取输入时， setIn()方法可能会引发异常：

  SecurityException: In this exception checkPermission() method does not allow reassigning of the latest standard input stream when security manager exists.

  SecurityException：在此异常中，当存在安全管理器时，checkPermission()方法不允许重新分配最新的标准输入流。

Syntax:

句法：

    public static void setIn(InputStream set_in);

Parameter(s):

参数：

• InputStream set_in – represents the latest standard input stream.

  InputStream set_in –表示最新的标准输入流。

Return value:

返回值：

The return type of this method is void, it does not return anything.

此方法的返回类型为void ，它不返回任何内容。

Example:

例：

// Java program to demonstrate the example of 
// setIn () method of System Class
import java.lang.*;
import java.io.*;
public class SetInMethod {
public static void main(String[] args) throws Exception {
// Display file in a specific manner
System.setIn(new FileInputStream("E://Programs//getProperties().doc"));
// Read the first character in the file
char read_first_char = (char) System.in.read();
// Display first character of the File
System.out.println(read_first_char);
}
}

Output

输出量

E:\Programs>javac SetInMethod.java
E:\Programs>java SetInMethod
J

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

system.setin