java简单模拟Scanner键盘扫描功能的实现

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;

public class ScannerDemo {
public static void main(String... strings) throws Exception {
while (true) {
System.out.println("请输入数据:");
PrintStream p = System.out;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));//包装System.in
String s = null;
while ((s = br.readLine()) != null) {
p.println(s);
}
}
}
}