动手动脑

import java.util.Random;
import java.util.Scanner;
public class TestSeed
{
    public static void main(String[] args)
 {
       
        Random r = new Random(System.currentTimeMillis());
        System.out.println("请输入要得到多少随机数");
        int m;
        Scanner in = new Scanner(System.in);
        m = in.nextInt();
        for(int i=0;i<m;i++)
         System.out.println( r.nextInt());
        
    }
}
运行结果：
请输入要得到多少随机数
10
1620020807
-2070122496
58291264
742117536
-1983758661
-1649711892
1181536659
1091375721
-870160946
-1878357734

public class MethodOverload {
         public static void main(String[] args) {
                   System.out.println("The square of integer 7 is " + square(7));
                   System.out.println("\nThe square of double 7.5 is " + square(7.5))；  
   }
         public static int square(int x) {
                   return x * x;
         }
         public static double square(double y) {
                   return y * y;
         }
}
运行结果：