Running file in the same package problem

I have 2 java file packed in the same package:
DBConnection.classpackage main;
import java.sql.*;
public class DBConnection {
}t1.class
package main;
import main.DBConnection;
import java.util.ArrayList;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.sql.*;
public class t1 {
}They are packed in the same directory, the path is:
D:\java\project1\main\DBConnection.class
D:\java\project1\main\t1.class
When i was in command prompt (window), I tried both of these but encounterd the following error
D:\java\project1\main>java t1
D:\java\project1\main>java -cp D:\java\project1\main t1
I encountered the following errors:
Exception in thread "main" java.lang.NoClassDefFoundError: t1 (wrong name: main/t1)
When I tried:
D:\java\project1\main>java -cp D:\java\project1 t1
I got this error:
Exception in thread "main" java.lang.NoClassDefFoundError: t1
Can anyone tell me the reason? Thx.

package main;
import main.DBConnection;You don't need to import a class in the same package.

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