递归阶乘

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package 递归;

public class DiGuiDemo {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
   System.out.println("5的阶乘："+jiecheng(5));
	}
   public static int jiecheng(int n) {
	   if(n==1) {
		   return 1;
	   }else {
		   return n*jiecheng(n-1);
	   }
	
   }
}

递归读取文件目录

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package File类;

import java.io.File;

public class DiGuiDemo2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
     File f=new File("D:\\steam");
    
     getAllFile(f);
	}
public static void getAllFile(File f) {
	File[] fileArray=f.listFiles();
	if(fileArray!=null) {
		for(File file:fileArray) {
			//判断该file对象是否是目录
			if(file.isDirectory()) {
				getAllFile(file);
			}else {
				System.out.println(file.getAbsolutePath());
			}
		}
	}
}
}