Java System setErr() Method

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

Syntax

Parameter

err - It is the new standard error output stream.

Exception:

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

Example 1

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;
public class SystemSetErrExample1 {
	public static void main(String[] args) throws FileNotFoundException {
		OutputStream os = new FileOutputStream("abc.txt");
PrintStream ps = new PrintStream(os);
System.setErr(ps);
System.out.println("Done!!");
	}
}

Test it Now

Output:

Done!!

Example 2

import java.io.PrintStream;
public class SystemSetErrExample2 {
	public static void main(String[] args)  {		
		ByteArrayOutputStream s = new ByteArrayOutputStream();
PrintStream p = new PrintStream(s);
System.setErr(p);
System.out.println(p);
	}
}

Test it Now

Output:

java.io.PrintStream@ed17bee

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Java System Class