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游戏中的算法与计算思维 04：第一张、第二张与匹配状态 · App Inventor 2 中文网
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Width=Fill parent；FontSize=24；TextColor=#183153；Text=记忆翻牌 · 第 4课
逐步搭建
增加第一、第二、已配对和步数变量，定义 0盖住/1翻开/2匹配。
Touched 只处理状态为 0 的牌；第一为...
游戏中的算法与计算思维 07：按难度保存最佳成绩 · App Inventor 2 中文网
... 先预测，再运行
四对 4 步 20 秒、六对 6 步 10 秒，谁更好？
先记下自己的答案，运行起始工程与完成工程比较；答案见文末。
开始实战
以上一课完成工程为起点，先导入并运行，再另存为本课...
Convert a byte array to integer in Java and vice versa
... the ByteBuffer. It can do all the work for you.
byte[] arr = { 0x00, 0x01 };
ByteBuffer wrapped = ByteBuffer.wrap(arr); // big-endian by default
short num = wrapped.getShort(); // 1
ByteBuffer dbuf = ByteBuffer.allocate(2);
dbuf.putShort(num);
byte[] bytes = dbuf.array(); // { 0, 1 }
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Why does the month argument range from 0 to 11 in JavaScript's Date constructor?
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answered Mar 31 '10 at 11:40
leonbloyleonbloy
62.5k1717 gold badges123123 silver badges166166 bronze badges
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Sass negative variable value?
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216
Try it like this
margin: 0 (-$pad) 20px (-$pad);
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What does the tilde (~) mean in my composer.json file?
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143
Tilde means next significant release. In your case, it is equivalent to >= 2.0, < 3.0.
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Python list iterator behavior and next(iterator)
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199
What you see is the interpreter echoing back the return value of next() in addition to i being...
How do I change the background color of a plot made with ggplot2
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123
To change the panel's background color, use the following code:
myplot + theme(panel.backgrou...
Is it possible to set transparency in CSS3 box-shadow?
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1 Answer
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.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
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114
Counterintuitively, the fastest version, on Hotspot 8, is:
MyClass[] arr = myList.toArray(new...