Skip to content

Instantly share code, notes, and snippets.

View Smalladragon's full-sized avatar

肖龙 Smalladragon

15 followers · 16 following
  • 河南省邓州市
View GitHub Profile
@Smalladragon
Smalladragon / 运算符
Created February 26, 2019 09:13
Java基础
# 三目运算符 #
条件运算符
结构：boolean表达式?表达式1:表达式2;
运算规则
先计算boolean表达式；
如果boolean表达式的值为true，整个表达式的值为表达式1的值；
如果boolean表达式的值为false，整个表达式的值为表达式2的值
int a = 100, b = 200;
@Smalladragon
Smalladragon / 运算符
Created February 26, 2019 09:07
java基础
![11.png](data:image/png;base64,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
@Smalladragon
Smalladragon / 运算符
Created February 26, 2019 09:04
Java基础
# 算术运算符 #
基本运算符
加(+)、减(-)、乘(*)、除(/)
取模运算符
%
–自增(减)运算符
++、--
@Smalladragon
Smalladragon / 基本类型间转换
Last active February 25, 2019 08:06
java基础
# 基本类型间转换 #
不同的基本类型直接可以相互转换
自动类型转换(隐式类型转换)
从小类型到大类型可以自动完成
![51.png](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAtsAAABtCAYAAABwfK3pAAAgAElEQVR4nO2dB5zdRdX+ZzebSggBQqghiRBagNBb6IKAoEhHBMWKNH1B5G34vqKvL2L7qyAivgKWFwRR4EWQHnrvLYAkgVAC0iFA6u7/fM/Oc5lcdu+ud/cmJnuefG7u3Xt/ZX4zZ84858yZM01thjXHjE2BQCAQCAQCgUCgd9G8qAsQCAQCgUAgEAgsqQiyHQgEAoFAIBAINAhBtgOBQCAQCAQCgQYhyHYgEAgEAoFAINAgBNkOBAKBQCAQCAQahCDbgUAgEAgEAoFAg9Al2W5qakrz589P8+bNSy0tLf65ubnZ3xsJ7surGq2trf7SZ8qhvzs7J9D7oM6pa7WB5ET139bW5i+1Fy99t6gQMtV4qN70GV0hfSEZqBe0A+eji3iVbSZZ43ug+/Xv37/huqovoWxfjQnq++VvgcUP9CHpcNoVqD/Rh9XO5fiv4/ht9uzZqV+/fpXrcVypWxc2eB5xljlz5lR0D++ULdB9SL+Csu4W1dgoGRSn4IXs0c4lN0F+NYZzvM6phWpuIxnvzrk1y9zVAeosGrToUOpwja5oKorK0+A6d+5cr9BBgwZ94N5lpQcaDwljqUhpH/CPrMg6k6mBAweGTPUSqE8pQyk/KcN6IZKt6+tFm+l+vPQ99+Te/I7uCvQOVLfqK7TJe++9V2mHwOIN2pA2nTVrlrcpYy0QaeF3+uKAAQP8/Z133vF3EXT1O/Sq/l6URhjlA8OHD3f9QJn0jIHuQWMmepR21UuysChQ7QyjfJRn8ODBFdlk/OG7kiR3h5t0pOPefffdynhTL7q8M4WDiNDpdEMRbZGrRoAH5L5LLbVUhfBQiVTczJkzK9ZpWQFBihYeRLbpgEOHDq0oW2RCJEfHld7hReklriV
@Smalladragon
Smalladragon / 基本数据类型
Created February 24, 2019 12:30
java基础
# int类型 #
最常用的整数类型，一个int类型的变量占用4个字节，即32位的内存空间。int的最大表示范围为-2147483648 ~2147483647，大约正负21个亿多些。
# 整数直接量 #
整数直接量(literal)就是直接写出的整数
int a = 100;
# 关于整数直接量的注意事项 #
@Smalladragon
Smalladragon / 数据类型
Created February 24, 2019 12:02
java基础
# 分类 #
基本数据类型（Primary Data Type）
引用数据类型（Reference Data Type）
# Java基本数据类型 #
8种
4类
整数类型
浮点数类型
@Smalladragon
Smalladragon / 进制转换
Created February 24, 2019 11:40
java基础
# 进制转换 #
进制转换
人们利用符号来计数的方法
由一组数码符号和两个基本因素“基数”与“位权”构成
基数
进位计数制的每位数上可能有的数码的个数
如：十进制的每位上的数码有0、1……9十个数码，所以基数为10，而二进制、八进制和十六进制的基数分别是2、8和16
@Smalladragon
Smalladragon / 常量和变量
Created February 21, 2019 07:33
java基础
# 常量 #
概念
在程序运行过程中值不能发生改变的数据称为
常量。
声明
用关键字final来定义
final Type varName = value [, varName [ =value] …];
final int globalAccount = 100, nationalAccount = 50;
final double PI=3.14159;
@Smalladragon
Smalladragon / 注释
Created February 21, 2019 07:23
Java基础
# 注释 #
单行注释
//some codes here
多行注释
/*some codes here*/
文档注释
@Smalladragon
Smalladragon / java关键字
Created February 20, 2019 08:03
关键字
![21.png](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAzYAAAHlCAYAAAAnemnpAAAgAElEQVR4nOydBVwVWRuHH7iUoKACiiBgYHeuza66dufavXa32N3dvTZ2rp3Y3aIiggoqopTk5cI3MyrSpfu5uOfhd3/ce2fmxNyZOe//nPe8R+uq59tIv7AwBIIfgamBPkXNzTj90uNHF0UgEAgEAoFAkEbJpK+P9o8uhEAgEAgEAoFAIBB8K0LYCAQCgUAgEAgEgjSPEDYCgUAgEAgEAoEgzSOEjUAgEAgEAoFAIEjzCGEjEAgEAoFAIBAI0jxC2AgEAoFAIBAIBII0jxA2AoFAIBAIBAKBIM0jhI1AIBAIBAKBQCBI8whhIxAIBAKBQCAQCNI8QtgIBAKBQCAQCASCNI8QNgKBQCAQCAQCgSDNI4TNv5CQ4OAfXQSBQCAQ/INERkYSFhLyo4shEAgEPxU/nbBxuX+fbUuXJNhgPLl3lzFdOuHl6Zms9LzfvGbIHy24fu5skvuGhgTTq14djuxwRB0WlqJyf+HamdPUL5CXuSOG4fPuXarSEAgEAsG/G8flS6mbPw8Xjx39bmmumDKJFZMnEhER8d3SFAgEgrTETydsPNzdWDNzOo2KFuLulctxth/Z7sjlkydoU+EXDm/bmmR6ty5c4M7lS4xs35azhw4mum+4Opyn9+8xZ+gQFo8dnaryF69QkcxZsihl6/J7VbzfvklVOgKBQCD4d/Ly2TM2LVygvB/3Z1dePX/+XdJ98/IlO1evom/Devj7+MTY9vyxM14eHt8lH4FAIPi38tMJG/u69WjUsRNqtZpRHdpx+sD+qG1yL9bpffuiPifH5euGk5Pyv2DJUlSsUTPGNtdHjzi4eWPUZ4N06dDS0kJbW5sOg4bwwsWFq2dOJ5i2nL/sjhAdXT095jjuRE9fn0D/AHauWhnvsYEBAaJXTiAQCNIYgf7+DGvzB6HR2h916PdxSRs2Zx7GmTLx9P59etS