尚学堂J2SE下(必威体育精装版)I.pptVIP

hashCode hashCode()方法和equals()方法是在Object类中就已经定义了的，所以在java中定义的任何类都会有这两个方法 原始的equals()方法用来比较两个对象的地址值，而原始的hashCode()方法用来返回其所在对象的物理地址 集合类的常用算法 java.util.Collections里面的静态方法 binarySearch () sort () shuffle () 课堂练习 利用InputStream和OutputStream实现文件的拷贝 提示： InputStream input = new FileInputStream(e:/login.html); OutputStream output = new FileOutputStream(e:/login2.html); while((num = input.read())!= -1) { output.write(num); } output.close(); input.close(); 示例 FileReader reader = new FileReader(e:\\login.html); int num = 0; while((num = reader.read())!= -1) { System.out.print((char)num); } reader.close(); 示例 FileWriter writer = new FileWriter(e:\\mydat.dat); for(int i = 0;i50000;i++) { writer.write(i); } writer.close(); 缓冲流示例 /**创建一个FileWriter 对象*/ FileWriter fw=new FileWriter(mytest.txt); /**创建一个BufferedWriter 对象*/ BufferedWriter bw=new BufferedWriter(fw); bw.write(大家好！); bw.write(我正在学习BufferedWriter。); bw.newLine(); bw.write(请多多指教！); bw.newLine(); bw.write(email: zhangsan@); bw.flush(); fw.close(); 缓冲流示例 /**创建一个FileReader对象.*/ FileReader fr=new FileReader(mytest.txt); /**创建一个BufferedReader 对象.*/ BufferedReader br=new BufferedReader(fr); /**读取一行数据.*/ String line=br.readLine(); while(line!=null){ System.out.println(line); line=br.readLine(); } /**流的关闭.*/ br.close(); fr.close(); 示例 try { OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(e:\\test.txt)); writer.write(To be or not to be is a question!); System.out.println(Encoding: + writer.getEncoding()); writer.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } 示例 InputStreamReader reader = new InputStreamReader(System.in); BufferedReader buffer = new BufferedReader(reader); String content = null; try { content = buffer.readLine(); while(con