关于jquery:面向过程变量声明赋值分支循环函数

变量和类型

正文

变量

常量

const 保留关键字，但不可用

final：相似 const

强类型语言

推导类型 var

在 Java10 之后引入。

罕用变量类型

String 和 Object（留神大写）不是内置类型

类型转换

函数转换：

int g = Integer.valueOf(“32”); // String s = g.toString(); / 谬误：primitivetype 不能 toString() / String s = (new Integer(g)).toString();

快捷键：

syso +

alt+shift+s

运算符和表达式

赋值 / 取值 / 算术 / 比拟 / 逻辑 / 其余

字符串

没有内插形式

数组

一维

多维

不辨别多维 / 交织，只有一种格局（同 C# 中的交织数组）：

• 3 行 2 列的数组

  int[][] arr = new int3;

• 3 行不定列的数组

  // 先申明后赋值 int[][] arr = new int[3][]; arr[0] = new int[] { 1, 2}; arr[1] = new int[] { 1, 2, 3}; arr[1] = new int[4]; // 申明后立刻赋值 int[][] arr = {{ 1, 2}, {3, 4, 5}, {6, 7, 8, 9} };

没有这种写法：

int[,] arr = new int[2,3];

分支 / 循环

办法根底

申明 / 调用 /return/ 递归

Ctrl+1：主动生成办法定义（Auto-generated method stub）

F3：转到定义

办法下面增加正文：Alt+Shift+J，没有 /// 主动补足

/**

 * @param i
 * @param j
 */ private static void sum(int i, int j) {// TODO Auto-generated method stub}

办法进阶

值 / 援用

没有 ref/out 用法，只辨别参数类型

public static void myFun(ref int a) {// 编译谬误

重载

可选参数

不反对：

public static void myFun(int a = 0) {// 语法错误

params

用 …（可变参数）代替

public static void main(String[] args) {myFun(3,5,6); myFun(new int[3]); } public static void myFun(int… a) {

元组

无此语法

finalize() 办法
For-Each 循环
for(type element: array)
{
    System.out.println(element);
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