多线程Runnable

package cn.hncu;

public class NumberRunnable implements Runnable{
private int first;
public NumberRunnable(int first){

    this.first=first;
}
public void run(){
    System.out.println();
    for(int i=first;i<50;i=i+2)
        System.out.print(i+" ");
    System.out.println("over! ");

}
public static void main(String args[]){

    NumberRunnable taget=new NumberRunnable(1);
    Thread thread_odd=new Thread(taget,"奇数线程");
    thread_odd.start();
    new Thread(new NumberRunnable(2),"偶数线程").start();

}

}