一:动手动脑
1.编写一个方法,使用以上算法生成指定数目(比如1000个)的随机整数
package reserve;
import java.util.Scanner;
import java.util.Arrays;
import java.util.Random;
public class Main{
public static void main(String[] args) {
Random random=new Random();
Scanner sc=new Scanner(System.in);
System.out.println("请输入产生随机数的个数:");
int count=sc.nextInt();
byte[] buffer=new byte[count];
random.nextBytes(buffer);
System.out.println(Arrays.toString(buffer));
}
}
package hu;
import java.util.Random;
import java.util.Scanner;
public class Hu {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int m = (int)Math.pow(7,5);
int n = (int)Math.pow(2, 31) - 1;
int c = 0;
System.out.print("请输入要产生随机数的数量:");
int count = in.nextInt();
for(int i = 0;i<count;i++)
{
Random x1 = new Random();
int x3 = x1.nextInt(10);
int x2 = (m* x3+c)%n;
System.out.println(x2);
if (i%5==0)//进行换行操作
{System.out.println("");}
}
}
}
2.请看一下代码,你发现了什么特殊之处吗?
package reserve;
import java.util.Scanner;
import java.util.Arrays;
import java.util.Random;
public class Main{
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;
}
}
代码测试截图:
展现了Java中,方法的重载(方法名相同,参数类型,参数个数,或者参数顺序不同)
只有计算出来结果才能判断出类型。(方法的返回值不作为方法重载的判断条件)
来源:oschina
链接:https://my.oschina.net/u/4339309/blog/4173372