J2SE 5.0的static import

2019-11-18 14:49:04

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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();
    }
  }
}

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