import java.util.*;import java.io.*;public class Test{		private File root;	public Test(File root){		this.root=root;	}	public static void main(String[] args){		String filePath = "";		if(args.length!=1){			System.out.println("错误参数");			System.exit(0);		}		filePath = args[0];				File f = new File(filePath);		if(f.exists()){		}else{			System.out.println("目录/文件不存在");		}				Test t = new Test(f);		t.calculate();	}		public void calculate(){		if(this.root.isDirectory()){			//递归计算子目录大小			File[] t = this.root.listFiles();			for(File f :t ){				long len = this.calculate(f);					String ext = "";				if(len>=1024 &&len<1024*1024 ){					ext = len/1024+"KB";				}else if(len>=1024*1024 && len<1024*1024*1024){					ext = len/(1024*1024)+"MB";				}else if(len>1024*1024*1024){					ext = len/(1024*1024*1024)+"GB";				}else{					ext = len+"Bytes";				}								System.out.println((f.isFile()?"文件 ":"目录 ")+f.getName()+"：\t"+ext );			}		}else{			//直接显示大小			System.out.println("文件 "+this.root.getName()+"：\t"+this.root.length()+"Bytes" );		}	}		public long calculate(final File f){		if(f.isFile()){			return f.length();		}else{			File[] t = f.listFiles();			long len = 0l;			for(File fs :t ){				len += this.calculate(fs);			}			return len;		}	}	}