输入
Scanner in = new Scanner(System.in);
输出
System.out,println(in.nextLine());
in.nextLine()读取in，根据具体内容可使用nextInt()或nextFloat()
自动补全
在eclipse中使用“alt+/”会出现可能的语法内容，双击或enter选择
concole
控制台
右侧显示红色标记表示程序正在运行
可以同时运行多个程序，程序太多可能会卡
变量
变量需要实现定义类型，如
int a;
double b;
常量
final int a = 10;
整数
int
整数与整数运行结果一定是整数，如10 / 3 = 3
浮点数
double
整数，浮点数，与浮点数运行结果皆为浮点数
强制类型转化
a = 1.5;
(int)a = 1;
将a强制转化为整型变量
(float)(1 + 1) = 2.0;
注释
选中行后使用“ctrl + /”本行转为注释不运行或在行首输入“//”
多行注释
/语句
语句/
first off:as a first point; first of all. "first off, I o...
1.firstly(first,in the first place,first of all,to begin ...
I wish I could remember the first day, First hour, first ...
1.:first,:first-child,:first-of-type的区别？ :first---选择器忽略树...
I wish I could remember that first day, First hour, first...
今天写了一个容器，first in first out，代码如下：
Sometimes things are more, people are overwhelmed Maybe a...
the very first and the very first time
We are reading the first verse of the first chapter of a ...
We are reading the first verse of the first chapter of a ...
本文标题：first
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