2、写出以下程序的功能 import java.io.*; public class TestFile public static void main(String args[])throws Exception BufferedReader br new BufferedReader( new InputStreamReader(System.in)); BufferedWriter bw = new BufferedWriter(new FileWriter("input.txt")); Strings; while(true) System.out.print("请输入一个字符串："： System.out.flush(; s=br.readLine(); if(s.length(==0)break; bw.write(s); bw.newLine(; } bw.close(); 《JAVA程序设计》A卷第7页共9页《JAVA 程序设计》A 卷 第 7 页 共 9 页 2、写出以下程序的功能。 import java.io.*; public class TestFile { public static void main(String args[]) throws Exception { BufferedReader br = new BufferedReader( new InputStreamReader(System.in)); BufferedWriter bw = new BufferedWriter(new FileWriter(“input.txt")); String s; while (true) { System.out.print("请输入一个字符串： "); System.out.flush(); s=br.readLine(); if (s.length()==0) break; bw.write(s); bw.newLine(); } bw.close(); }