Java System setOut() Method

The setOut() method of Java System class is used to reassign the standard output stream.

Syntax:

Parameters:

out - new standard output stream.

Throws:

SecurityException: This exception will throw if security manager exists and its checkPermission method doesn't allow reassigning of the standard outputstream.

Example

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;

public class SystemSetOutExample {

	public static void main(String[] args) throws FileNotFoundException {
		File f=new File("abc.txt");
		System.out.println("file exist = "+f.exists());
		FileOutputStream i=new FileOutputStream(f);
		System.setOut(new PrintStream (i));
		System.out.println("OK");
	}
}

Output: