方法一：

public class coin{

public static void main(String args[]){

int n = 0;


int m = 0;


int len = 1000;


int str[] = new int[len];


for(int i = 0 ; i < len ; i ++){


str[i] = ( int )(Math.random()*2);


if(str[i] == 1 ){


n = n + 1;


}else{


m = m + 1;


}

}

System.out.println("正面朝上的次数："+n);


System.out.println("反面朝上的次数："+m);


}

}

方法二：

package org.lxh.demo.coin;
import java.util.Random;
public class coin{
public static void main(String args[]){
int n = 0;
int m = 0;
int len = 1000;
int str[] = new int[1000];                 //创建一千个的数组
Random rad = new Random();
for(int i = 0 ; i < len ; i ++){
str[i] = rad.nextInt(2);              //为一千个的数组赋值
if(str[i] == 1 ){
n = n + 1;
}else{
m = m + 1;
}
}
System.out.println("正面朝上的次数："+n);
System.out.println("反面朝上的次数："+m);
}
}