有点不理解他什么意思，有谁可以告诉我一下吗，谢谢
package zh.codegym.task.task16.task1629;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
public class Solution {
public static volatile BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
public static void main(String[] args) throws InterruptedException {
Read3Strings t1 = new Read3Strings();
Read3Strings t2 = new Read3Strings();
//在此编写你的代码
t1.printResult();
t2.printResult();
}
//在此编写你的代码
public static class Read3Strings extends Thread{
@Override
public void run(){
try {
String s1=reader.readLine();
String s2=reader.readLine();
String s3=reader.readLine();
String s4=reader.readLine();
String s5=reader.readLine();
String s6=reader.readLine();
String n1=s1+" "+s2+" "+s3;
String n2=s4+" "+s5+" "+s6;
} catch (IOException e) {
e.printStackTrace();
}
}
public void printResult() {
System.out.println();
}
}
}