如何使用java代码实现键盘输入,控制台输出,当输入over字符时结束

实现思路:
    1.定义输入流 System.in
	2.定义输出流 System.out
	3.判断获取的字符串是否为特定字符串	  

package com.java265;
import java.io.*;
//键盘输入,控制台输出,在遇到over时候结束
public class TestClass {
	public static void main(String[] args) {
		InputStream is = null;
		InputStreamReader isr = null;
		BufferedReader br = null;
		OutputStream os = null;
		OutputStreamWriter osw = null;
		BufferedWriter bw = null;
		is = System.in;
		isr = new InputStreamReader(is);
		br = new BufferedReader(isr);
		//BufferedReader br=new BufferedReader(new InputStreamReader(System.in));三句合写
		os = System.out;
		osw = new OutputStreamWriter(os);
		bw = new BufferedWriter(osw);
		//BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));三句合写
		String line = null;
		try {
			while ((line = br.readLine()) != null) {// 读到键盘输入的一行
				if (!("over".equals(line))) {//不要写s.equals("over");要防止s为空的情况报错
					bw.write(line.toUpperCase());
					bw.newLine();
					bw.flush();
				} else {
					break;
				}
			}
		} catch (IOException e) {
			e.toString();
		}
		finally{
			if(bw!=null){
				try {
					bw.close();
				} catch (IOException e) {
					e.toString();
				}
			}
			if(br!=null){
				try {
					br.close();
				} catch (IOException e) {
					e.toString();
				}
			}		
		}
	}
}