JAVA_SE基礎——71.Random類製作隨機驗證碼

public class Demo5 {
	public static void main(String[] args) {

		 char[] arr={'s','b','g','h','a','c'};
		StringBuilder sb=new StringBuilder();
		Random  random=new Random();
		for(int i=0;i<4;i++){
			int index=random.nextInt(arr.length);
			sb.append(arr[index]);
		}
		System.out.println("驗證碼:"+sb);
	} 

	
	
}