Question

如何使用生成对复制String向量？

例如，我得到了一个包含三个单词的向量：香蕉，猫和狗。如何将此向量和单词复制到另一个向量？

String playerOne = null;
    String playerTwo = null;
    int nrOfWords = 0;
    String[] allWords = new String []{"Banana", "Cat", "Book", "Sandwich", "Strawberry", "Milk", "Card", "Computer", "Science", "Java", "Math", "Physics", "Materials", "Phone", "Pencil", "Tv", "Clock", "Shoes", "Jacket", "Gloves"};
    String [] pair = null;
    boolean gameIsOver = false;


    System.out.print("How many words do you want?(max 20); ");
    nrOfWords = in.nextInt();
    while(nrOfWords < 1 || nrOfWords > 20)
    {
        if( nrOfWords > 20)
        {
            System.out.print("You have choosen more than 20 words. Please try again:");
            nrOfWords = in.nextInt();
        }
        if(nrOfWords < 1)
        {
            System.out.print("Error, not a vaild number. Plese Try again.");
            nrOfWords = in.nextInt();
        }
    }

    //Create a duplicate of allWords vector with generatePairs.

Answer 1

您不需要使用while循环来创建0到20之间的随机数：

nrOfWords = in.nextInt(20/*max number*/);

现在你将计算到nrOfWords并将它们添加到String []对中的偏移处;

pair = new String[nrOfWords]; //be sure to initalize or you'll get a NullPointerException
int index = 0; //set up index var
for(int counter=0;counter!=nrOfWords;counter++) {
    pair[index] = allWords[index];
    //or pick a random word:
    //pair[index] = allWords[in.nextInt(allWords.length)];
}

如何在内存中生成对

1 个答案: