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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)