java 在dos下运行多行输入的问题，有谁知到呀！

java运行时想在dos下输入多行数据要怎样实现？例如
24 15 12 22
15 15 23 45
12 23 45 46
这种形式。谢谢！！！
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class JavaEnter {

    /**
     * @param args
     */
    public static void main(String[] args) throws IOException{
        // TODO Auto-generated method stub

        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String data_in_1,data_in_2,data_in_3,data_all = null;
        String data[];
        
        data_in_1 = in.readLine();
        data_in_2 = in.readLine();
        data_in_3 = in.readLine();
        data_all = data_in_1+" "+data_in_2+" "+data_in_3;

        data = data_all.split(" ");

        for(String s : data){
            System.out.println(s);
        }
        
    }

}

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这个可以吗?
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如果是固定三行，二楼版主的代码是正确的
如果是不固定的行数，用while循环
----------------解决方案--------------------------------------------------------
谢了！！！
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