java统计指定文件的大小以及包含的文件夹和文件数
package com.stone.caculator;
import java.io.File;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Caculator {
int totalFolder = 0;
int totalFile = 0;
public static void main(String args[]) {
String folder = "F:/movie";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println("统计日期："+sdf.format(new Date()));
try {
Caculator size = new Caculator();
long fileSizeByte = size.getFileSize(new File(folder));
DecimalFormat df=(DecimalFormat)DecimalFormat.getInstance();
System.out.println("总文件夹数: "+ df.format(size.getTotalFolder()));
System.out.println("总文件数: " + df.format(size.getTotalFile()));
df.setGroupingSize(3);
System.out.println("文件夹大小(单位字节): " + df.format(fileSizeByte) + " Bytes");
} catch (Exception e) {
e.printStackTrace();
}
}
public long getFileSize(File folder) {
long foldersize = 0;
File[] filelist = folder.listFiles();
for (int i = 0; i < filelist.length; i++) {
if (filelist[i].isDirectory()) {
totalFolder++;
foldersize += getFileSize(filelist[i]);
} else {
totalFile++;
foldersize += filelist[i].length();
}
}
return foldersize;
}
public int getTotalFolder() {
return totalFolder;
}
public int getTotalFile() {
return totalFile;
}
}

统计项目中Java文件数和Java代码行数
其实就是使用递归遍历目录下所有文件
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class JavaCodeLines {
private static final String PROJECT_DIR = "C:\\workspace\\YourProj";
private static int fileNum = 0;
private static int lineNum = 0;
private static void listNext(File dir) {
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
listNext(files[i]);
} else {
// System.out.println(fs[i].getAbsolutePath());
try {
if (files[i].getName().endsWith(".java")) {
fileNum++;
BufferedReader br = new BufferedReader(new FileReader(
files[i]));
while (br.readLine() != null) {
lineNum++;
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) throws Exception {
File root = new File(PROJECT_DIR);
listNext(root);
System.out.println("Java files number: " + fileNum);
System.out.println("Java code lines: " + lineNum);
}
}

题目：输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数。
程序分析：利用while语句,条件为输入的字符不为 '\n '.
程序设计：
import java.util.Scanner;
public class ex7 {
public static void main(String args[])
{
System.out.println("请输入字符串：");
Scanner scan=new Scanner(System.in);
String str=scan.next();
String E1="[\u4e00-\u9fa5]";
String E2="[a-zA-Z]";
int countH=0;
int countE=0;
char[] arrChar=str.toCharArray();
String[] arrStr=new String[arrChar.length];
for (int i=0;i
{
arrStr[i]=String.valueOf(arrChar[i]);
}
for (String i: arrStr )
{
if (i.matches(E1))
{
countH++;
}
if (i.matches(E2))
{
countE++;
}
}
System.out.println("汉字的个数"+countH);
System.out.println("字母的个数"+countE);
}
}
以上就是Java统计英文字母、空格、数字和其它的实现代码了，希望大家以后多多支持脚本之家。

Java代码：
package com.dreadmer.code;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class CodeTotal {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
String path="L:\\项目\\1\\src";
List list=total(path);
System.out.println("文件数量："+list.size());
//统计代码行数
Integer row=0;
for (File file : list) {
System.out.println(file.getName());
FileReader fr=new FileReader(file);//创建文件输入流
BufferedReader in=new BufferedReader(fr);//包装文件输入流，可整行读取
String line="";
while((line=in.readLine()) != null) {
row++;
}
}
System.out.println("代码行数："+row);
}
public static List total(String path){
List files=new ArrayList();
File file=new File(path);
File []files2=file.listFiles();
for (File file3 : files2) {
if(file3.isFile()){
files.add(file3);
}else {
files.addAll(files.size(), total(file3.getPath()));
}
}
return files;
}
}