package testReadFile;import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;public class ReadFile {public static void main(String[] args) {BufferedReader reader = null;String buffer = null;try {reader = new BufferedReader(new FileReader("src/testRead.txt"));do {buffer = reader.readLine();System.out.println(buffer);} while (reader.read() != -1);} catch (IOException e) {e.printStackTrace();} finally {try {// 问题一：需要显示的调用close，也要对close再加一层try catch 还有个问题是// 问题二：close函数也有可能抛异常，如果这里抛出异常，try块里面的异常信息就会被丢弃
                reader.close();} catch (IOException e) {e.printStackTrace();}}}
}

package testReadFile;import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;public class ReadFile {public static void main(String[] args) {String bufferSugar = null;try (BufferedReader readerSugar = new BufferedReader(new FileReader("src/testRead.txt"))) {bufferSugar = readerSugar.readLine();System.out.println(bufferSugar);} catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();}}}

package testReadFile;import java.io.*;public class ReadFile
{public ReadFile(){}public static void main(String args[]){String bufferSugar = null;Exception exception;exception = null;Object obj = null;BufferedReader readerSugar = new BufferedReader(new FileReader("src/testRead.txt"));bufferSugar = readerSugar.readLine();System.out.println(bufferSugar);if(readerSugar != null)readerSugar.close();break MISSING_BLOCK_LABEL_90;exception;if(readerSugar != null)readerSugar.close();throw exception;Exception exception1;exception1;if(exception == null)exception = exception1;elseif(exception != exception1)exception.addSuppressed(exception1);throw exception;IOException e;e;e.printStackTrace();}
}