13518219792
亲测：结果为空
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原因，System.exit(0)将当前JVM停止掉了。这个方法的作用就是将当前程序停止，参数为0表示正常退出，参数为1表示非正常退出。
JVM都停止了，后面的程序自然运行不了。所以finally里的语句根本没走到。
package test2;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class JavaCodeAnalyzer {
public static void analyze(File file) throws IOException{
//FileOutputStream fos = new FileOutputStream("F;"+File.separator+"result.txt");
if(!(file.getName().endsWith(".txt")||file.getName().endsWith(".java"))){
System.out.println("输入的分析文件格式不对！");
}
InputStream is= new FileInputStream(file);
BufferedReader br= new BufferedReader(new InputStreamReader(is));
String temp;
int count=0;
int countSpace=0;
int countCode=0;
int countDesc=0;
MapString, Integer map = getKeyWords();
while((temp=br.readLine())!=null){
countKeys(temp, map);
count++;
if(temp.trim().equals("")){
countSpace++;
}else if(temp.trim().startsWith("/*")||temp.trim().startsWith("//")){
countDesc++;
}else{
countCode++;
}
}
System.out.printf("代码行数:"+countCode+"占总行数的%4.2f\n",(double)countCode/count);
System.out.printf("空行数:"+countSpace+"占总行数的%4.2f\n",(double)countSpace/count);
System.out.printf("注释行数:"+countDesc+"占总行数的%4.2f\n",(double)countDesc/count);
System.out.println("总行数："+count);
System.out.println("出现最多的5个关键字是：");
System.out.println("");
System.out.println("");
System.out.println("");
System.out.println("");
System.out.println("");
}
public static void main(String[] args) {
getKeyWords();
File file = new File("F://Test.java");
try {
analyze(file);
} catch (IOException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}
}
public static MapString,Integer getKeyWords(){
MapString,Integer map = new HashMapString, Integer();
String[]keywords = {"abstract","assert","boolean","break","byte","case","catch","char","class","continue","default","do","double","else","enum","extends","final","finally","float","for","if","implements","import","instanceof","int","interface","long","native","new","package","private","protected","public","return"," strictfp","short","static","super"," switch","synchronized","this","throw","throws","transient","try","void","volatile","while","goto","const"};
for(String s:keywords){
map.put(s, 0);
}
return map;
}
public static void countKeys(String s,MapString,Integer map){
SetString keys = map.keySet();
for(String ss:keys){
if(s.indexOf(ss)!=-1){
map.put(ss, map.get(ss)+1);
}
}
}
}
上班没啥时间了，还有点没写完，你在想想。
1、拿到代码查看项目当中是否有readme这样的文件，如果没有查看是否有文档之类的
2、代码当中没有文档，那么就想你的同事或者其他人要这个框架的介绍或者资料
3、先请教别人这个框架的大体思路
4、自己独立去按照文档或者其他人说的思路去看代码
5、不懂的地方全部记录下面，一次行去问，有的时候很多问题在你看到后面的东西的时候就自然明白了
6、看懂了代码之后自己尝试着写一个，看自己的理解是否正确就这么多了。
