Changing System.out to a PrintWriter
System.out is a PrintStream, which is an OutputStream. PrintWriter has a constructor that takes an OutputStream as an argument. Thus, if you want, you can convert System.out into a PrintWriter using that constructor:
//: c12:ChangeSystemOut.java
// Turn System.out into a PrintWriter.
import com.bruceeckel.simpletest.*;
import java.io.*;
public class ChangeSystemOut {
private static Test monitor = new Test();
public static void main(String[] args) {
PrintWriter out = new PrintWriter(System.out, true);
out.println("Hello, world");
monitor.expect(new String[] {
"Hello, world"
});
}
} ///:~
It’s important to use the two-argument version of the PrintWriter constructor and to set the second argument to true in order to enable automatic flushing; otherwise, you may not see the output.
