Java命令行參數處理 CLOPS

CLOPS 是一個用來處理 Java 程序中的命令行參數的類庫。

示例代碼：

import java.io.File;
import generated.WcParser;
import generated.WcOptionsInterface;

public class Main {
  public static void main(String[] args) throws Exception {
    WcParser parser = new WcParser();
    if (!parser.parse(args)) {
      System.out.println("Usage: java Main [OPTIONS] file...");
      System.exit(1);
    }
    WcOptionsInterface opt = parser.getOptionStore();
    if (opt.isWordsSet())
      System.out.println("I should print a word count.");
    if (opt.isBytesSet())
      System.out.println("I should print a byte count.");
    for (File f : opt.getFiles()) checkFile(f);
  }

  public static void checkFile(File f) {
    System.out.print("The file " + f.getPath());
    if (f.exists())
      System.out.println(" exists.");
    else
      System.out.println(" does not exist.");
  }
}

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