J2SE 5.0的static import

import static Java.lang.System.err;

import static java.lang.System.out;

import java.io.IOException;

import java.io.PrintStream;

public class StaticImporter {

public static void writeError(PrintStream err, String msg)

throws IOException {

// Note that err in the parameter list overshadows the imported err

err.println(msg);

}

public static void main(String[] args) {

out.println("Good morning, " + "java2s");

out.println("Have a day!");

try {

writeError(System.out, "Error occurred.");

} catch (IOException e) { e.printStackTrace();

}

}

}