Java 学习 05 - 常用类

根据教程里边的东西, 我统计了以下几个类或者分支

Number

Integer x = 5;

Character

Character ch = new Character('a');

String

String greeting = "菜鸟教程";
char[] helloArray = {'r', 'u', 'n', 'o', 'o', 'b'};
String helloString = new String(helloArray);

StringBuffer / StringBuilder

StringBuffer sBuffer = new StringBuffer("菜鸟教程官网：");

Array

数组的类型和数组的大小都是确定的.

# way 1
dataType[] arrayRefVar = new dataType[arraySize];
# way2
dataType[] arrayRefVar = {value0, value1, ..., valuek};

日期

Date(some ms)