使用集合存储10个1-50(含50)的随机偶数元素,
要求数字不能重复,按指定格式输出到根目录的num.txt中,
例如: 48,44,40,38,34,30,26......

[Java] 纯文本查看 复制代码

public class Test03 {
	public static void main(String[] args) throws IOException {
		HashSet<Integer> set = new HashSet<Integer>();
		Random r = new Random();
		
		while(set.size()<10) {
			set.add(r.nextInt(50)+1);
		}
		
		ArrayList<Integer> list = new ArrayList<>();
		list.addAll(set);
		
		Collections.sort(list);
		
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("num.txt"));
		
		for (int i = list.size()-1;i>=0;i--) {
			bos.write(list.get(i).toString().getBytes());
			bos.write("\r\n".getBytes());
			bos.flush();
		}
		bos.close();
	}
}

使用集合存储10个1-50(含50)的随机偶数元素,
要求数字不能重复,按指定格式输出到根目录的num.txt中,
例如: 48,44,40,38,34,30,26......

[Java] 纯文本查看 复制代码

public class Test03 {
	public static void main(String[] args) throws IOException {
		HashSet<Integer> set = new HashSet<Integer>();
		Random r = new Random();
		
		while(set.size()<10) {
			set.add(r.nextInt(50)+1);
		}
		
		ArrayList<Integer> list = new ArrayList<>();
		list.addAll(set);
		
		Collections.sort(list);
		
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("num.txt"));
		
		for (int i = list.size()-1;i>=0;i--) {
			bos.write(list.get(i).toString().getBytes());
			bos.write("\r\n".getBytes());
			bos.flush();
		}
		bos.close();
	}
}