1 import static org.junit.Assert.*; 2  3 import java.io.File; 4 import java.io.FileNotFoundException; 5 import java.io.FileReader; 6 import java.io.FileWriter; 7 import java.io.IOException; 8  9 import org.junit.Test;10 11 import com.sun.org.apache.bcel.internal.generic.NEW;12 13 14 15 16 public class MyTest {17     //通过字符流写入数据到指定的文件中18     @Test19     public void testWrite() throws IOException {20         String path = "F:"+File.separator+"demo.txt";21         FileReader fileReader = null;22         try {23             fileReader = new FileReader(path);24             char[] buf = new char[10];25             int temp =0;26 //            fileReader去读取10个字符，并且将读取到的字符放到buf数组里面，实际督导多少个字符的个数存在temp中27             while((temp = fileReader.read(buf))!=-1){28                 System.out.println(new String(buf,0,temp));29             }30             31         } catch (FileNotFoundException e) {32             // TODO Auto-generated catch block33             e.printStackTrace();34         }35         36         37     }38 39 }

char[] buf = new char[100];