《Java程序设计》第一次作业:源代码计算器 学习流程 <p><span style="font-family:Calibri;font-size:14px;"> </span></p><p>目标1:目标1:给定一个源代码文件(.cs, .java),输出该文件的总行数、空行数、注释行数、代码行数。</p>
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class computesourceline {
private static int totalLine =0;
private static int whiteLines = 0;
private static int commentLines = 0;
private static int normalLines = 0;
//定义相关变量
//利用sumCode(f) 进行读文件
public static void main(String[] args) {
File f = new File("src/computesourceLine.java");
sumCode(f);
}
//TODO Auto-generated method atub
//使用BufferedWriter 类,以默认缓冲的字符输出输入流
private static void sumCode(File file) {
BufferedReader br = null;
//bufferedReader对应br为空
boolean comment = false;
try {
br = new BufferedReader(new FileReader(file));
String line = "";
try {
while ((line = br.readLine()) != null) {
line = line.trim();
if (line.matches("^[\\s&&[^\\n]]*$")) {
whiteLines++;
} else if (line.startsWith("/*") && !line.endsWith("*/")) {
commentLines++;
comment = true;
} else if (true == comment) {
commentLines++;
if (line.endsWith("*/")) {
comment = false;
}
} else if (line.startsWith("//")) {
commentLines++;
} else {
normalLines++;
}
}
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
//关闭
br.close();
totalLine =whiteLines+commentLines+normalLines;
System.out.println("总行数:"+totalLine);
System.out.println("空行数:"+whiteLines);
System.out.println("注释行数:"+commentLines);
System.out.println("代码行数:"+normalLines);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}