键盘输入,控制台输出,在遇到over时候结束

package cn.io;
import java.io.*;
//键盘输入,控制台输出,在遇到over时候结束
public class Test8 {
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();
}
}
}

}
}