line = line.trim() 这个是什么用法呢?不明白这句话的意思。全部的代码如下:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOExcefdfption; public class hhh {
static long normalLines = 0;
static long commentLines = 0;
static long whiteLines = 0;
public static void main(String[] args) {
File f = new File("D:\\share\\JavaProjects\\TankWar1.9.11\\src");
File[] codeFiles = f.listFiles();
for(File child : codeFiles){
if(child.getName().matches(".*\\.java$")) {
parse(child);
}
}
System.out.println("normalLines:" + normalLines);
System.out.println("commentLines:" + commentLines);
System.out.println("whiteLines:" + whiteLines);
} private static void parse(File f) {
BufferedReader br = null;
boolean comment = false;
try {
br = new BufferedReader(new FileReader(f));
String line = "";
while((line = br.readLine()) != null) {
line = line.trim();
if(line.matches("^[\\s&&[^\\n]]*$")) {
whiteLines ++;
} else if (line.startsWith("/*") && !line.endsWith("*/")) {
commentLines ++;
comment = true;
} else if (line.startsWith("/*") && line.endsWith("*/")) {
commentLines ++;
} else if (true == comment) {
commentLines ++;
if(line.endsWith("*/")) {
comment = false;
}
} else if (line.startsWith("//")) {
commentLines ++;
} else {
normalLines ++;
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(br != null) {
try {
br.close();
br = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
} }
谢谢回答,等待中。。
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOExcefdfption; public class hhh {
static long normalLines = 0;
static long commentLines = 0;
static long whiteLines = 0;
public static void main(String[] args) {
File f = new File("D:\\share\\JavaProjects\\TankWar1.9.11\\src");
File[] codeFiles = f.listFiles();
for(File child : codeFiles){
if(child.getName().matches(".*\\.java$")) {
parse(child);
}
}
System.out.println("normalLines:" + normalLines);
System.out.println("commentLines:" + commentLines);
System.out.println("whiteLines:" + whiteLines);
} private static void parse(File f) {
BufferedReader br = null;
boolean comment = false;
try {
br = new BufferedReader(new FileReader(f));
String line = "";
while((line = br.readLine()) != null) {
line = line.trim();
if(line.matches("^[\\s&&[^\\n]]*$")) {
whiteLines ++;
} else if (line.startsWith("/*") && !line.endsWith("*/")) {
commentLines ++;
comment = true;
} else if (line.startsWith("/*") && line.endsWith("*/")) {
commentLines ++;
} else if (true == comment) {
commentLines ++;
if(line.endsWith("*/")) {
comment = false;
}
} else if (line.startsWith("//")) {
commentLines ++;
} else {
normalLines ++;
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(br != null) {
try {
br.close();
br = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
} }
谢谢回答,等待中。。
比如说" ab c "执行trim后的结果就是"ab c"
String a = " a a ";
String b = a.trim();
System.out.println(b);
结果是:"a a"
比如public static void main(String[] args) { //主方法
String s =" ab c ";
System.out.println(s.trim());
}
输出结果为ab c,两边空格都没了
这个方法一般在一些聊天程序里用
String b = a.trim();
System.out.println(b);
String b = a.trim();
System.out.println(a);
System.out.println(b); 这样。。相信LZ应该看的会更明白一点了
返回字符串的副本,忽略前导空白和尾部空白。
返回字符串的副本,忽略前导空白和尾部空白。