listonlyjava.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例5.2.6 ListOnlyJava.java
import java.io.*;
class ListOnlyJava
{
	public static void main(String args[])
	{
		String dirname = "c:/io";       // 指定一个目录
		File files = new File(dirname);
		FilenameFilter onlyJava = new DirFilter("java");
		String s[] = files.list(onlyJava);
		System.out.println("All of Java Files in "+dirname+" :");
		for (int i=0; i < s.length; i++)
		{
			System.out.println(s[i]);
		}
	}
}
// 定义实现了FilenameFilter接口的类：DirFilter
class DirFilter implements FilenameFilter
{
	private String extendName;
	public OnlyJavaFilter(String extendName)  // 构造函数
	{
		this.extendName = "." + extendName;
	}
	public boolean accept(File dir, String name)
	{
		return name.endsWith(extendName);
	}
}