import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader; public class HelloWrold{
public static void main(String args[]){
System.out.println("hello,world");
File file = new File("AAA.txt");
BufferedReader reader = null;
try {
System.out.println("以行为单位读取文件内容,一次读一整行:");
reader = new BufferedReader(new FileReader(file));
String tempString = null;
int line = 1;
// 一次读入一行,直到读入null为文件结束
while ((tempString = reader.readLine()) != null) {
// 显示行号
System.out.println("line " + line + ": " + tempString);
line++;
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e1) {
}
}
}
}
}F:\JAVA\ClassPath>javac HelloWrold.java
HelloWrold.java:15: 找不到符号
符号: 类 FileReader
位置: 类 HelloWrold
reader = new BufferedReader(new FileReader(file));
^
1 错误
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader; public class HelloWrold{
public static void main(String args[]){
System.out.println("hello,world");
File file = new File("AAA.txt");
BufferedReader reader = null;
try {
System.out.println("以行为单位读取文件内容,一次读一整行:");
reader = new BufferedReader(new FileReader(file));
String tempString = null;
int line = 1;
// 一次读入一行,直到读入null为文件结束
while ((tempString = reader.readLine()) != null) {
// 显示行号
System.out.println("line " + line + ": " + tempString);
line++;
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e1) {
}
}
}
}
}F:\JAVA\ClassPath>javac HelloWrold.java
HelloWrold.java:15: 找不到符号
符号: 类 FileReader
位置: 类 HelloWrold
reader = new BufferedReader(new FileReader(file));
^
1 错误
import java.io.FileReader;