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对于Java中的文件操作，常见的有FileWriter()和FileReader();有时不注意写flush(),会发现写入数据或是读取数据错误，比如：
package lxt; import java.io.File; import java.io.FileReader; import
java.io.FileWriter; public class q2 { public static void main(String[] args) {
char[] arr=new char[19]; String ss="daddda"; File fl = new File("G:\\A.txt");
try { if (fl.exists() == false) { fl.createNewFile(); } FileWriter fw=new
FileWriter(fl); fw.write(ss); fw.flush(); FileReader Q=new FileReader(fl); int
t= Q.read(arr); for (int i = 0; i < t; i++) { System.out.print(arr[i]); }
//System.out.println(arr); fw.close(); }catch (Exception e){
System.out.println("异常"); } } }
会发现，我是写完文件后就立马接flush()方法，读取文件的数据后也接flush()
（注意close（）方法中包括了flush方法，close（）关闭流后无法读取，而flush（）刷新缓冲区还能继续对文件进行操作）
，这样方能保证文件的正常写入与读写，总结以上，若不加flush()方法，会发现，写不进文件，也读取不了，这时，数据全停留在缓冲区，而
flush()的意思就是刷新，清空缓冲区，强制将缓冲区的数据写入文件或是读取。
