帮我写一个简单的java程序吧，关于抛硬币的··· 要求随机抛20次，结果按顺序写出来， 谢谢了

public class Throwcoin {

/**

* @param args

*/

public static void main(String[] args) {

// TODO 自动生成的方法存根

for (int i = 1i <= 20i++) {

int j = (int) (Math.random() * 2)

if (j == 0) {

System.out.println("数凯第"+i+"次抛硬币：硬币正面拦型朝上")

} else {

System.out.println("第"简毕猜+i+"次抛硬币：硬币反面朝上")

}

}

}

}

JAVA练习之——抛硬币

import java.util.*

import java.io.*

interface game{

String get(int a)

}

interface gamefactory{

game getgame()

}

class yingbi implements game{

public String get(int a){

if(a==0) return "正面"

else return "反面仔宽"

}

}

class yingbifactory implements gamefactory{

public game getgame(){

return new yingbi()

}

}

class shazi implements game{

public String get(int a){

return String.valueOf(a+1)

}}

class shaizifactory implements gamefactory{

public game getgame(){return new shazi(){

public void a(){System.out.println("耐戚空new shazi()")

}

}}

}

public class Game {

public static void games(gamefactory factory,int a){

game s1=factory.getgame()

System.out.println(s1.get(a))

}

public static void print(ArrayList<String>e){

for(String y:e)

System.out.print(y)

}

/**

* @param args

*/

public static void main(String[] args) throws IOException{

DataInputStream in=new DataInputStream(System.in)

while(true){

System.out.println("请选择1：开始")

System.out.println("1：抛硬币")

int opinion=Integer.parseInt(in.readLine())

switch(opinion){

case 1:

System.out.println("开始？Y／N")

String a=in.readLine()

ArrayList<String>yin=new ArrayList<String>()

while(a.equals("Y")||a.equals("y")){

Random rand=new Random()

yingbifactory q=new yingbifactory()

int w=rand.nextInt(2)

yin.add(q.getgame().get(w))

games(q,w)

a=in.readLine()

}

print(yin)

System.out.println()

break

default:

System.exit(0)

}

// TODO 自动生成方法存昌瞎根

}

}

}

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