java - 卡牌洗牌和显示小程序

Question

我已经编写了一些代码来创建我下载的卡片的 ArrayList，现在尝试对它们进行洗牌，然后使用 Paint 方法显示它们。如何使用 g.drawImage 显示十张卡片？

    import java.awt.Image;
import java.applet.Applet;
import java.util.*;

public class DeckofCards1 extends Applet {

public void init ( ) {
    String[] suits = {"c", "s", "h", "d"};
    String[] values = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "j", "q", "k"};

    ArrayList<Image> images = new ArrayList<Image>( );
    for(String suit : suits){
            for(String value : values){
                 Image img = getImage ( getDocumentBase ( ), "images/" + suit +              value + ".gif" );
      images.add(img);
                     }
    }
    Collections.shuffle ( images ); //get ten cards randomly?
    }

    public void paint ( Graphics g ) { //display ten cards here?

        g.drawImage ( img, 10, 10, this );
        g.drawImage ( img, 10, 10, this );
        g.drawImage ( img, 10, 10, this );      
        g.drawImage ( img, 10, 10, this );
        g.drawImage ( img, 10, 10, this );
        g.drawImage ( img, 10, 30, this ); //what goes in place of img (which I know isn't right, simply a placeholder for now
        g.drawImage ( img, 10, 30, this );
        g.drawImage ( img, 10, 30, this );
        g.drawImage ( img, 10, 30, this );
        g.drawImage ( img, 10, 30, this );

    }
}          

Answer 1

关于混排，Collections.shuffle ( images ); 将随机排列 images 的元素。但我建议添加这一行:

private final Random random = new Random(4454776669L);

并使用Collections.shuffle(images, random);来代替。这里的数字 4454776669L 是伪随机数生成器的种子，当您使用相同的种子时，您会重现相同的随机数序列，如果您想重现相同的游戏或仅用于调试目的，这可能很有用。