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变量在计算机编程中太常见了，以下两种5+6的代码写法就体现了不使用变量与使用变量的区别。
* 写法一： public static void main(String[] args) { System.out.println(5+6); }
* 写法二： public static void main(String[]args){ int a = 5; int b = 6; System.out
.println(a+b); }
<>变化一：有限到无限
写法一表现出来的是两个固定的数相加，写法二表现出来的是两个变量相加，从有限到无限体现在两个方面：
* 方面1：从固定的两个数相加到任意两个数相加
* 方面2：从两个数相加到任意个数相加
<>变化二：算法的封装
写法一表现出来打印的是5+6的结果，写法二表现出来打印的是a+b的结果。写法二有一个算法封装的思想在里头，加法是包括在算法内，因为加法也是对解题方案的准确而完整的描述。
<>变化三：加法的复用
写法二把加法做成了一个模板，任何需要加法的地方都可以复用这个模板。
写法二引入两个简简单单的变量a和b就产生了如此多的变化，如果有关于写法二的其他想法欢迎发表在评论中。
