Java布尔运算就俩值?别笑,true和false才是程序员的命根子
一、类型1.说明1于java语言里面, 类型仅有两个值这般: true、false, 不存在别的值的。在C语言当中, 是有着0代表false以及1代表true这种情况的。2在底层进行存储之际, 此种类型会占用1个字节, 这是由于在实际开展存储操作之时, false在底层呈现为0, 而true呈现为1。3在实际开发进程当中, 布尔类型, 那可是极为重要的, 常常被运用在逻辑运算里, 以及条件控制语句之中。publicclassd15_{publicstaticvoidmain(String[] args){booleani1 true;if(i1){ System.out.println(我被正确数出了); }else{ System.out.println(我被错误输出了); } } }二、数据类型之间的类型转换1.转换规则1八种基本数据类型之中除了类型之外其他七种可以互相转换2向大容量进行小容量的转换, 这被称为自动转换此类形式, 关于容量按照从大到小的顺序作出排列标点符号。byte留意: 不管占用多少字符的任何一种浮点类型, 都在容量方面大于整数类型。char 与 short 所能表示的种类数量是一样的然而 char 能够获取到更大的正整数。3将大容量朝着小容量进转换, 此被称作强制类型转换, 得要添加上强制类型转换符, 如此程序方可编译通过, 然而处在运行阶段之时说不定会出现损失精度的情况, 故而要谨慎去使用。4在整数字面值未超过byte的取值范围之时, 可以将其直接赋予byte, 在整数字面值未超出short的取值范围时, 能够直接赋给short, 当整数字面值没有超过chat的取值范围之际, 可以直接赋值给char。5在byte、short、char进行混合运算之际, 它们各自会先转变为int类型, 而后再开展运算。6进行多种数据类型运算之际, 要先转化成容量最大的那一种类型, 而后再开展运算。三、练习注意, 我们不可以将最终所得到的结果在程序之前予以考虑进去, 我们的程序是需要先进行编译然后再运行的, 我们计算得出的结果是运行之后的, 我们要先对编译阶段的语法语义的正确性加以考虑。bytea 10;//编译通过因为没有超出byte的范围intb 3;//byte c a/b;//编译不通过因为得到的值为int类型必须强制转换才行,修改方式如下bytec (byte)(a/b);四、运算符1.加上运算符, 减去运算符, 乘以运算符, 除以运算符, 求余数运算符或称为取模运算符, 自加1运算符, 自减1运算符。2.留意: 于一个式子当中存在不止一个运算符, 运算符具备优先级, 倘若没法确定, 那就添加上小括号, 如此一来优先级便会得到提高, 没必要去记住运算符的那段优先级。3.要说关于那个运算符, 以下呢是以作为例子来说的, 那么--呢情况也是这样, 就不会再做重复的讲解了。小结: 运算符能够出现在变量之前, 运算符也能够出现在变量之后, 不管是在变量之前的情况, 又或者是在变量之后的情形, 只要 运算符一旦结束, 那个变量的值就会自行加 1。intk 10; k; System.out.println(k);k; System.out.println(k);下面我们对他们之间的区别进行讨论1对于出现变量的后面inta1 10;inta2 a1 ; System.out.println(a1); System.out.println(a2);从上边给出的示例能够瞧出, 存在这样的一种规则, 该规则是, 要先开展赋值运算操作, 之后针对这个变量里头存储着的数值进行加一的操作。2对于出现再变量的前面inta1 10;inta2 a1; System.out.println(a1); System.out.println(a2); 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