import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.Scanner;public class DemoScanner {        //打印    public static void printScanner() {        Scanner s = new Scanner(System.in);        System.out.println("请输入字符串：");        while (true) {            String line = s.nextLine();            if (line.equals("exit"))                break;            System.out.println(">>>" + line);        }    }    //自定义换行符    public static  void lnScanner() {        Scanner s = new Scanner("123 asdf sd 45 789 sdf asdfl,sdf.sdfl,asdf    ......asdfkl    las");        s.useDelimiter(" |,|\\.");        while (s.hasNext()) {            System.out.println(s.next());        }    }    //InputStreamReader类比scanner效率高，其中的BufferedReader类中对象只生成一次，以后可以重复使用，这就是效率高的原因。     private static String readString(String prompt) {         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));         String str = null;        try {             System.out.print(prompt);             str = br.readLine();         } catch (IOException e) {             e.printStackTrace();         }        return str;     }          public static void main(String[] args) {         String str = readString("请输入字符串：");         System.out.println("readString6 方法的输入：" + str);    }}