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Commit8e778f3

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Java第二天
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‎day02/ASCII码表.doc‎

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/*
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常量：在程序执行的过程中其值不可以发生改变
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举例：π
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分类：
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A:字面值常量
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1，12.5
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B:自定义常量(面向对象部分讲解)
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字面值常量分类：
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A:字符串常量 用""括起来的内容
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B:整数常量 所有的整数数据
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C:小数常量 所有的带小数的数据
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D:字符常量 用单引号括起来的内容
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E:布尔常量 只有两个值：true和false
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F:空常量 null(数组部分去讲解)
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*/
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classConstantDemo {
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publicstaticvoidmain(String[]args) {
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//字符串常量
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System.out.println("HelloWorld");
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//整数常量
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System.out.println(100);
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//小数常量
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System.out.println(12.345);
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//字符常量
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System.out.println('A');
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//下面的是错误的
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//System.out.println('BC');
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System.out.println('1');
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//布尔常量
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System.out.println(true);
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System.out.println(false);
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}
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}
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/*
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二进制
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由0,1组成。以0b开头
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八进制
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由0,1,…7组成。以0开头
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十进制
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由0,1,…9组成。整数默认是十进制的
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十六进制
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由0,1,…9,a,b,c,d,e,f(大小写均可)。以0x开头
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*/
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classJinZhiDemo {
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publicstaticvoidmain(String[]args) {
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System.out.println(0b100);//4
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System.out.println(0100);//64
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System.out.println(100);//100
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System.out.println(0x100);//256
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}
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}
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