staticimporter.java

来自「Java5.0 Tiger 程序员高手秘笈一书的源代码」· Java 代码 · 共 34 行

package com.oreilly.tiger.ch08;

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) {
    if (args.length < 2) {
      err.println(
        "Incorrect usage: java com.oreilly.tiger.ch08 [arg1] [arg2]");
      return;
    }

    out.println("Good morning, " + args[0]);
    out.println("Have a " + args[1] + " day!");

    try {
      writeError(System.out, "Error occurred.");
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}