编译通过，但是执行不成功，环境变量设置没问题。

哪里问题呢，jdk卸载重装了。

package Thread;

public class TestThread1 {
public static void main (String [] args ) {
Runner r = new Runner();
Thread t = new Thread (r);
t.start();
for (int i =0 ; i<= 100 ; i++ ) {
System.out.println("The Main --" +  i);
}
}
}


class Runner implements Runnable {
public void run () {
for (int i = 0 ; i<= 100 ; i ++ ) {
System.out.println("The Runner --" +  i);
}
}
}

[解决办法]
带上包名。。。
javac -d . TestThread1.java
java Thread.TestThread1