Java print流

/*
*print流，只有输出流
*printWriter,printStream 用于多种类型的输出
*/
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;
public class Test18 {

public static void main(String[] args) throws FileNotFoundException
{
OutputStream os = new FileOutputStream("f:/d.txt",true); //true表示追加，不覆盖。
PrintStream ps = new PrintStream(os);
System.setOut(ps);
ps.println("中文");
}
}