listoffiles.java

来自「Java与面向对象程序设计实验教学讲义.复数类的实现,复数类的复杂运算,身份证号」· Java 代码 · 共 33 行

import java.util.*;
import java.io.*;
public class ListOfFiles implements Enumeration {
    private String[] listOfFiles;
    private int current = 0;
    public ListOfFiles(String[] listOfFiles) {
        this.listOfFiles = listOfFiles;
    }
    public boolean hasMoreElements() {
        if (current < listOfFiles.length)
            return true;
        else
            return false;
    }
    public Object nextElement() {
        InputStream in = null;
        if (!hasMoreElements())
            throw new NoSuchElementException("No more files.");
        else {
            String nextElement = listOfFiles[current];
            current++;
            try {
                in = new FileInputStream(nextElement);
            } catch (FileNotFoundException e) {
                System.err.println("ListOfFiles: Can't open " + nextElement);
            }
        }
        return in;
    }
}