01Java方法

coding

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;

publicclass Main{

publicstaticvoid 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=newbyte[count];

random.nextBytes(buffer);

System.out.println(Arrays.toString(buffer));

}

}

package hu;

import java.util.Random;

import java.util.Scanner;

publicclass Hu {

publicstaticvoid 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;

publicclass Main{

publicstaticvoid 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));

}

publicstaticint square(int x) {

return x*x;

}

publicstaticdouble 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)

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