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<>char类型
* 在Java中char（2个字节）类型描述了UTF-16编码中的一个代码单元，除非确实要处理UTF-16代码单元，最好将字符串作为抽象数据类型处理
<>字符串（String）（StringBuffer和StringBuilder待添加）
*
Java的字符串就是Unicode字符序列，Java没有内置的字符串类型，而是在标准Java库中提供了一个预定义类，叫做“String”，它的实例用双引号括起来
例如 String e = " "; //一个空字符串 String greeting = "Hello"; <>String 中常见的方法
* substring（）
作用：从较大的字符串中提取一个子串
例如： String greeting = "Hello"; String s = greeting.substring(0,3);
//调用该方法之后，s="Hel",只会抽取位置为3之前的，即（0，1,2）（不包括位置为3）的，其长度也非常好计算，len=3-0=3.
* “+”拼接
Java语言允许使用“+”连接两个字符串，需要注意的是，如果是将字符串和非字符串进行连接，后者则会被转换为字符串（在Java中，任何一个字符串都可以转换成字符串）
例如：
例子1.普通拼接
String expletive = "Expletive"; String PGL3 = "deleted"; String message =
expletive+ PGL3； //message = Expletivedeleted
例子2.字符串与其他类型的拼接
int a = 13; String name = "name" + a; //结果为"name13"
例2的特性则被运用到输出语句中，我们经常用到的
*
equals（）
作用： 可以用来检测两个字符串是否相等（内容），例如表达式：
s.equal(t)
如果字符串s与字符串t相等，则返回true，否则返回false。
注意：不要使用==检测两个字符串是否相等，该运算符只能检测两个字符串是否放在同一个位置上
*
length（）
作用：返回该字符串的长度
String greeting = "Hello"; int n = greeting.length(); //长度为5
像String.charAt(int index),可以返回该位置的代码单元，String有很多有用的方法，想要了解更多请查看API
