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Showing content from https://www.tutorialspoint.com/java/lang/system_setin.htm below:

Java System setIn() Method

The Java System setIn() method reassigns the "standard" input stream.

Following is the declaration for java.lang.System.setIn() method

public static void setIn(InputStream in)

in − This is the new standard input stream.

This method does not return any value.

SecurityException − if a security manager exists and its checkPermission method doesn't allow reassigning of the standard input stream.

The following example shows the usage of Java System setIn() method. In this program, we've set the FileInputStream as Input using setIn() method. Now using System.in.read(), the first char is read from file and is displayed on the console.

package com.tutorialspoint;

import java.io.FileInputStream;

public class SystemDemo {

   public static void main(String[] args) throws Exception {
    
      // existing file
      System.setIn(new FileInputStream("file.txt"));

      // read the first character in the file
      char ret = (char)System.in.read();

      // returns the first character
      System.out.println(ret);              
   }
} 

Let us assume we have a text file file.txt which consist of −

This is System class!!!

Compilation will produce the following result −

T

The following example shows the usage of Java System setIn() method. In this program, we've set the System.in as Input using setIn() method. Now using System.in.read(), the first char is read from console and is displayed on the console.

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) throws Exception {
    
      // existing file
      System.setIn(System.in);

      // read the first character from the console
      char ret = (char)System.in.read();

      // returns the first character
      System.out.println(ret);              
   }
} 

Compilation will produce the following result −

T
T

java_lang_system.htm

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