Java在匹配遊戲中隨機填充數組

Question

我有一個9值的數組。我想隨機使用這些值來填充另一個大小爲18的數組，並認爲它們應該只出現兩次。

String[] cards = {"1","2","3","4","5","6","7","8","9"}; 

Answer 1

對於讀這個問題的懶惰的人。

這是我的LazyRandomizer類的結果。

[7, 5, 4, 7, 9, 3, 8, 1, 1, 3, 5, 4, 6, 2, 6, 2, 8, 9] 

這是代碼。通常，我會解釋代碼，但我現在感覺太懶惰了。祝你好運，理解它。

import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.Collections; 
import java.util.List; 

public class LazyRandomizer { 

    public static void main(String[] args) { 
     String[] cards = { "1", "2", "3", "4", "5", "6", "7", "8", "9" }; 
     List<String> randomCards = new ArrayList<>(); 
     randomCards.addAll(Arrays.asList(cards)); 
     randomCards.addAll(Arrays.asList(cards)); 
     Collections.shuffle(randomCards); 
     System.out.println(Arrays.toString(randomCards 
       .toArray(new String[randomCards.size()]))); 
    } 

}