第3章练习题4

/**
 * speed.java
 * @author Camille-He
 *
 */
import java.util.Random;
public class speed {
public static void main(String ar[]) {
Random rand = new Random();
Integer n1 = new Integer(47);
Integer n2 = new Integer(47);
double distance = rand.nextFloat() + 50 ;
double time = 50 + Math.random() * 100; //产生50~150之间的随机小数
System.out.println(distance);
System.out.println(time);
System.out.println("The speed is:" + distance/time);
System.out.println(n1 == n2);  //==和！=比较的是对象的引用,判断是否相等应该是对对象的内容进行比较的
System.out.println(n1.equals(n2));
}
}