From c2470d429674b810f01d59e5a4e2aa088b772ae5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=BE=90=E9=9B=A8=E6=99=B4?= <12078100+yibaoqiqiu@user.noreply.gitee.com> Date: Mon, 5 Dec 2022 14:25:37 +0000 Subject: [PATCH 1/3] =?UTF-8?q?=E5=88=A0=E9=99=A4=E6=96=87=E4=BB=B6=20desk?= =?UTF-8?q?top.ini?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- desktop.ini | 4 ---- 1 file changed, 4 deletions(-) delete mode 100644 desktop.ini diff --git a/desktop.ini b/desktop.ini deleted file mode 100644 index d957fd1..0000000 --- a/desktop.ini +++ /dev/null @@ -1,4 +0,0 @@ -[ViewState] -Mode= -Vid= -FolderType=Generic -- Gitee From 83a4468f3cac9b730e57d22f45c6bb39b5010d6b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=BE=90=E9=9B=A8=E6=99=B4?= <2137161545@qq.com> Date: Mon, 5 Dec 2022 22:42:16 +0800 Subject: [PATCH 2/3] =?UTF-8?q?switch=E5=88=86=E6=94=AF?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...72\346\234\254\346\223\215\344\275\234.md" | 8 +- ...25\357\274\210\344\270\200\357\274\211.md" | 3 +- ...25\357\274\210\344\272\214\357\274\211.md" | 429 +++++++++++++++++- ...25\357\274\210\344\270\211\357\274\211.md" | 281 ++++++++++++ .../images/12.02/1.PNG" | Bin 0 -> 9812 bytes .../images/12.02/2.PNG" | Bin 0 -> 11028 bytes .../images/12.02/3.PNG" | Bin 0 -> 13439 bytes .../images/12.02/4.PNG" | Bin 0 -> 29990 bytes 8 files changed, 711 insertions(+), 10 deletions(-) create mode 100644 "03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" create mode 100644 "03 \345\276\220\351\233\250\346\231\264/images/12.02/1.PNG" create mode 100644 "03 \345\276\220\351\233\250\346\231\264/images/12.02/2.PNG" create mode 100644 "03 \345\276\220\351\233\250\346\231\264/images/12.02/3.PNG" create mode 100644 "03 \345\276\220\351\233\250\346\231\264/images/12.02/4.PNG" diff --git "a/03 \345\276\220\351\233\250\346\231\264/20221125 IDEA\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234.md" "b/03 \345\276\220\351\233\250\346\231\264/20221125 IDEA\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234.md" index 062980c..3d2d5b5 100644 --- "a/03 \345\276\220\351\233\250\346\231\264/20221125 IDEA\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234.md" +++ "b/03 \345\276\220\351\233\250\346\231\264/20221125 IDEA\347\232\204\345\237\272\346\234\254\346\223\215\344\275\234.md" @@ -12,7 +12,7 @@ - 修改安装路径,把Deatination Folder的安装路径改为D:\develop - 勾选Create Desktop Shortcut,安装IDEA的桌面图标 - - 点击安装,安装完,点击完成即可 + - 点击安装,安装完,点击完成即可 3. #### **IDEA的代码结构** @@ -24,7 +24,7 @@ - 类(class) :java源码的实际文件 - ![1](F:\Java仓库\java-base\03 徐雨晴\images\11.25\1.PNG) + ![1](images\11.25\1.PNG) 4. #### **IDEA的基本配置** @@ -41,7 +41,7 @@ - 注释是指在程序中添加的说明性信息 - 注释不参与程序运行,仅起到说明作用 - ![2](F:\Java仓库\java-base\03 徐雨晴\images\11.25\2.png) + ![2](images\11.25\2.png) 5. #### **IDEA的常用快捷键** @@ -70,7 +70,7 @@ - 把模块复制到空项目所在路径下 - 出现如下错误,知道如何处理 - ![3](F:\Java仓库\java-base\03 徐雨晴\images\11.25\3.png) + ![3](images\11.25\3.png) diff --git "a/03 \345\276\220\351\233\250\346\231\264/20221125 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\200\357\274\211.md" "b/03 \345\276\220\351\233\250\346\231\264/20221125 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\200\357\274\211.md" index a1ecd39..5f654b5 100644 --- "a/03 \345\276\220\351\233\250\346\231\264/20221125 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\200\357\274\211.md" +++ "b/03 \345\276\220\351\233\250\346\231\264/20221125 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\200\357\274\211.md" @@ -102,7 +102,6 @@ - 范例2:HelloWorld - 10 #### 6.键盘录入 @@ -181,4 +180,4 @@ public class class1 { 3. ##### 将以上1和2输出的结果截图发朋友圈,集15个赞. -4 \ No newline at end of file +![4](images\11.25\4.png) \ No newline at end of file diff --git "a/03 \345\276\220\351\233\250\346\231\264/20221129 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\272\214\357\274\211.md" "b/03 \345\276\220\351\233\250\346\231\264/20221129 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\272\214\357\274\211.md" index 101b8a9..a75ee4f 100644 --- "a/03 \345\276\220\351\233\250\346\231\264/20221129 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\272\214\357\274\211.md" +++ "b/03 \345\276\220\351\233\250\346\231\264/20221129 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\272\214\357\274\211.md" @@ -33,7 +33,7 @@ byte b3 = (byte) (b1 + b2); ``` 2. boolean类型不能与其他基本数据类型相互转换。 -2. char类型参与运算(十进制)。(a=97   A=65   0=48) +2. char类型参与运算(十进制)。 **1.2强制转换** @@ -58,7 +58,7 @@ byte a = 3; byte b = 4; byte c = a + b; //错误。因为两个byte变量相加,会先提升为int类型 byte d = 3 + 4; //正确。常量优化机制 -int e = a + b;//正确。byte参与运算,类型自动提升为int类型。 +int e = a + b;//正确。byte参与运算,数据类型自动提升为int类型。 ``` **常量优化机制**: @@ -106,9 +106,9 @@ int c = a + b; **注意:** 1. /和%的区别:两者都做除法, - - / 取结果的商, + - / 取结果的商 - - % 取结果的余数。 + - % 取结果的余数 2. 整数操作只能得到整数,要想得到小数,必须有浮点数参与运算。 @@ -214,7 +214,428 @@ public class test { } ``` +#### 2.2自增自减运算符 +| 符号 | 作用 | 说明 | +| :--: | :--: | :---------: | +| ++ | 自增 | 变量的值加1 | +| -- | 自减 | 变量的值减1 | + +注意事项: + +​ ++和-- 既可以放在变量的后边,也可以放在变量的前边。 + +​ 单独使用的时候, ++和-- 无论是放在变量的前边还是后边结果是一样的。 + +​ 参与操作的时候,如果放在变量的后边,先拿变量参与操作,后拿变量做++或者--。 + +​ ——**(先计算后加减)** + +​ 参与操作的时候,如果放在变量的前边,先拿变量做++或者--,后拿变量参与操作。 + +​ ——**(先加减后计算)** + +​ 最常见的用法:单独使用。 + +```java +int i = 10; +i++; // 单独使用 +System.out.println("i:" + i); // i:11 + +int j = 10; +++j; // 单独使用 +System.out.println("j:" + j); // j:11 + +int x = 10; +int y = x++; // 赋值运算,++在后边,所以是使用x原来的值赋值给y,x本身自增1 +System.out.println("x:" + x + ", y:" + y); // x:11,y:10 + +int m = 10; +int n = ++m; // 赋值运算,++在前边,所以是使用m自增后的值赋值给n,m本身自增1 +System.out.println("m:" + m + ", n:" + n); // m:11,n:11 +``` + +练习: + +```java +int x = 10; +int y = x++ + x++ + x++; +System.out.println(y); // y的值是多少? +/* +解析,三个表达式都是++在后,所以每次使用的都是自增前的值,但程序自左至右执行,所以第一次自增时,使用的是10进行计算,但第二次自增时,x的值已经自增到11了,所以第二次使用的是11,然后再次自增。。。 +所以整个式子应该是:int y = 10 + 11 + 12; +输出结果为33。 +*/ +注意:通过此练习深刻理解自增和自减的规律,但实际开发中强烈建议不要写这样的代码!小心挨打! +``` + +#### 2.3 赋值运算符 + +赋值运算符的作用是将一个表达式的值赋给左边,左边必须是可修改的,不能是常量。 + +| 符号 | 作用 | 说明 | +| :--: | :--------: | :-------------------: | +| = | 赋值 | a=10,将10赋值给变量a | +| += | 加后赋值 | a+=b,将a+b的值给a | +| -= | 减后赋值 | a-=b,将a-b的值给a | +| *= | 乘后赋值 | a*=b,将a×b的值给a | +| /= | 除后赋值 | a/=b,将a÷b的商给a | +| %= | 取余后赋值 | a%=b,将a÷b的余数给a | + +注意: + +扩展的赋值运算符隐含了强制类型转换。 + +~~~java +short s = 10; +s = s + 10; // 此行代码报出,因为运算中s提升为int类型,运算结果int赋值给short可能损失精度 +s += 10; // 此行代码没有问题,隐含了强制类型转换,相当于 s = (short) (s + 10); +~~~ + +### 2.4 关系运算符 + +关系运算符有6种关系,分别为小于、小于等于、大于、等于、大于等于、不等于。 + +| 符号 | 说明 | +| :--: | :---------------------------------------------------------: | +| == | a==b,判断a和b的值是否相等,成立为true,不成立为false | +| != | a!=b,判断a和b的值是否不相等,成立为true,不成立为false | +| > | a>b,判断a的值是否大于b的值,成立为true,不成立为false | +| >= | a>=b,判断a的值是否大于等于b的值,成立为true,不成立为false | +| < | a**注意事项:** + +- ​ 关系运算符的结果都是boolean类型,要么是true,要么是false。 + + +- ​ 千万不要把“==”误写成“=”,"=="是判断是否相等的关系,"="是赋值。 + + +~~~java +int a = 10; +int b = 20; +System.out.println(a == b); // false +System.out.println(a != b); // true +System.out.println(a > b); // false +System.out.println(a >= b); // false +System.out.println(a < b); // true +System.out.println(a <= b); // true + +// 关系运算的结果肯定是boolean类型,所以也可以将运算结果赋值给boolean类型的变量 +boolean flag = a > b; +System.out.println(flag); // 输出false +~~~ + +#### 2.5 逻辑运算符 + +逻辑运算符把各个运算的关系表达式连接起来组成一个复杂的逻辑表达式,以判断程序中的表达式是否成立,判断的结果是 true 或 false。 + +| 符号 | 作用 | 说明 | +| :--: | :------: | :------------------------------------------: | +| & | 逻辑与 | a&b,a和b都是true,结果为true,否则为false | +| \| | 逻辑或 | a\|b,a和b都是false,结果为false,否则为true | +| ^ | 逻辑异或 | a^b,a和b结果不同为true,相同为false | +| ! | 逻辑非 | !a,结果和a的结果正好相反 | + +~~~java +//定义变量 +int i = 10; +int j = 20; +int k = 30; + +//& “与”,并且的关系,只要表达式中有一个值为false,结果即为false +System.out.println((i > j) & (i > k)); //false & false,输出false +System.out.println((i < j) & (i > k)); //true & false,输出false +System.out.println((i > j) & (i < k)); //false & true,输出false +System.out.println((i < j) & (i < k)); //true & true,输出true +System.out.println("--------"); + +//| “或”,或者的关系,只要表达式中有一个值为true,结果即为true +System.out.println((i > j) | (i > k)); //false | false,输出false +System.out.println((i < j) | (i > k)); //true | false,输出true +System.out.println((i > j) | (i < k)); //false | true,输出true +System.out.println((i < j) | (i < k)); //true | true,输出true +System.out.println("--------"); + +//^ “异或”,相同为false,不同为true +System.out.println((i > j) ^ (i > k)); //false ^ false,输出false +System.out.println((i < j) ^ (i > k)); //true ^ false,输出true +System.out.println((i > j) ^ (i < k)); //false ^ true,输出true +System.out.println((i < j) ^ (i < k)); //true ^ true,输出false +System.out.println("--------"); + +//! “非”,取反 +System.out.println((i > j)); //false +System.out.println(!(i > j)); //!false,,输出true +~~~ + +#### 2.6 短路逻辑运算符 + +| 符号 | 作用 | 说明 | +| :--: | :----: | :--------------------------: | +| && | 短路与 | 作用和&相同,但是有短路效果 | +| \|\| | 短路或 | 作用和\|相同,但是有短路效果 | + +​ 在逻辑与运算中,只要有一个表达式的值为false,那么结果就可以判定为false了,没有必要将所有表达式的值都计算出来,短路与操作就有这样的效果,可以提高效率。同理在逻辑或运算中,一旦发现值为true,右边的表达式将不再参与运算。 + +- 逻辑与&,无论左边真假,右边都要执行。 + +- 短路与&&,如果左边为真,右边执行;如果左边为假,右边不执行。 + +- 逻辑或|,无论左边真假,右边都要执行。 + +- 短路或||,如果左边为假,右边执行;如果左边为真,右边不执行。 + +~~~java +int x = 3; +int y = 4; +System.out.println((x++ > 4) & (y++ > 5)); // 两个表达都会运算 +System.out.println(x); // 4 +System.out.println(y); // 5 + +System.out.println((x++ > 4) && (y++ > 5)); // 左边已经可以确定结果为false,右边不参与运算 +System.out.println(x); // 4 +System.out.println(y); // 4 +~~~ + +#### 2.7 三元运算符 + +三元运算符语法格式: + +~~~java +关系表达式 ? 表达式1 : 表达式2; +~~~ + +解释:问号前面的位置是判断的条件,判断结果为boolean型,为true时调用表达式1,为false时调用表达式2。其逻辑为:如果条件表达式成立或者满足则执行表达式1,否则执行第二个。 + +举例: + +~~~java +int a = 10; +int b = 20; +int c = a > b ? a : b; // 判断 a>b 是否为真,如果为真取a的值,如果为假,取b的值 +~~~ + +#### 2.8 三元运算符案例 + +需求: + +​ 一座寺庙里住着三个和尚,已知他们的身高分别为150cm、210cm、165cm,请用程序实现获取这三个和尚的最高身高。 + +~~~java +public class OperatorTest02 { + public static void main(String[] args) { + //1:定义三个变量用于保存和尚的身高,单位为cm,这里仅仅体现数值即可。 + int height1 = 150; + int height2 = 210; + int height3 = 165; + //2:用三元运算符获取前两个和尚的较高身高值,并用临时身高变量保存起来。 + int tempHeight = height1 > height2 ? height1 : height2; + //3:用三元运算符获取临时身高值和第三个和尚身高较高值,并用最大身高变量保存。 + int maxHeight = tempHeight > height3 ? tempHeight : height3; + //4:输出结果 + System.out.println("maxHeight:" + maxHeight); + } +} +~~~ + +### 3.流程控制语句 + +​ 在一个程序执行的过程中,各条语句的执行顺序对程序的结果是有直接影响的。所以,我们必须清楚每 条语句的执行流程。而且,很多时候要通过控制语句的执行顺序来实现我们想要的功能。 + +#### 3.1 流程控制语句分类 + +结构 分支结构(if, switch) + +循环结构(for, while, do…while) + +#### 3.2 顺序结构 + +顺序结构是程序中最简单最基本的流程控制,没有特定的语法结构,按照代码的先后顺序,依次执行, 程序中大多数的代码都是这样执行的。 + +顺序结构执行流程图: + +![1](images\12.02\1.PNG) + +#### 3.3 分支结构之if语句 + +##### 3.3.1 if语句格式1 + +```java +格式: +if (关系表达式){ + 语句体; +} +``` + +执行流程: + +①首先计算关系表达式的值 + +②如果关系表达式的值为true就执行语句体 + +③如果关系表达式的值为false就不执行语句体 + +④继续执行后面的语句内容 + +![2](images\12.02\2.PNG) + +示例: + +```java +public class IfDemo { + public static void main(String[] args) { + System.out.println("请输入你的年龄:"); + // 如果年龄大于18岁, 就可以去网吧。 + int age = 17; + if (age >= 18){ + System.out.println("成年人,可以入内!"); + } + // int a = 10; + System.out.println("未成年人,禁止入内!"); + } +} +``` + +#### 3.3.2 if语句格式2 + +```java +格式: +if (关系表达式) { + 语句体1; +} else { + 语句体2; +} +``` + +执行流程: + +①首先计算关系表达式的值 + +②如果关系表达式的值为true就执行语句体1 + +③如果关系表达式的值为false就不执行语句体2 + +④继续执行后面的语句内容 + +![3](images\12.02\3.PNG) + +示例:奇偶数 + +任意给出一个整数,请用程序实现判断该整数是奇数还是偶数,并在控制台输出该整数是奇数还是偶数。 + +```java +public class Demo2If { + public static void main(String[] args) { + // 程序判断一个数, 是奇数还是偶数 + int num = 9; + if (num % 2 == 0) { + System.out.println("偶数"); + } else { + System.out.println("奇数"); + } + } +} +``` + +#### 3.3.3 if语句格式3 + +```java +格式: +if (关系表达式1) { + 语句体1; +} else if (关系表达式2) { + 语句体2; +} +... +}else { + 语句体n+1; +} +``` + +执行流程: + + ①首先计算关系表达式1的值 + + ②如果值为true就执行语句体1;如果值为false就计算关系表达式2的值 + +③如果值为true就执行语句体2;如果值为false就计算关系表达式3的值 + +④… + + ⑤如果没有任何关系表达式为true,就执行语句体n+1。 + +![4](images\12.02\4.PNG) + +示例: + + 定义一个在0~100之间的变量a, 90~100优秀,80~89良好,70~79中等,60~69及格,0~59请努力加油! + +```java +public class Demo3If { + public static void main(String[] args){ + int score = 65;//成绩录入 + if(score >= 90 && score <= 100){ + System.out.println("优秀"); + }else if (score >= 80 && score <= 89){ + System.out.println("良好"); + }else if (score >= 70 && score <= 79){ + System.out.println("中等"); + }else if (score >= 60 && score <= 69){ + System.out.println("及格"); + }else if (score >= 0 && score <= 59){ + System.out.println("请努力加油"); + }else{ + System.out.println("成绩有误!"); + } + } +} +``` + +#### 3.3.4 if语句格式3案例 + +​ 需求:小明快要期末考试了,小明爸爸对他说,会根据他不同的考试成绩,送他不同的礼物,假如你可以控制小明的得分,请用程序实现小明到底该获得什么样的礼物,并在控制台输出。 + +分析: + +①小明的考试成绩未知,可以使用键盘录入的方式获取值 + + ②由于奖励种类较多,属于多种判断,采用if...else...if格式实现 + +③为每种判断设置对应的条件 + +④为每种判断设置对应的奖励 + +```java +import java.util.Scanner; +public class IfTest02 { + public static void main(String[] args){ + // 1. 使用Scanner录入考试成绩 + Scanner sc = new Scanner(System.in); + System.out.println("请输入您的成绩:"); + int score = sc.nextInt(); + // 2. 判断成绩是否在合法范围内 0~100 + if(score >=0 && score <= 100){ + // 合法成绩 + // 3. 在合法的语句块中判断成绩范围符合哪一个奖励 + if(score >= 95 && score <= 100){ + System.out.println("自行车一辆"); + }else if(score >= 90 && score <= 94){ + System.out.println("游乐场一次"); + }else if(score >= 80 && score <= 89){ + System.out.println("变形金刚一个"); + }else { + System.out.println("挨顿揍, 这座城市又多了一个伤心的人~"); + } + }else{ + // 非法的话, 给出错误提示 + System.out.println("您的成绩输入有误!"); + } + } +} +``` ## 作业 diff --git "a/03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" "b/03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" new file mode 100644 index 0000000..7f65a7a --- /dev/null +++ "b/03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" @@ -0,0 +1,281 @@ +## 基础语法(三) + +### 1. switch语句 + +#### 1.1 分支语句switch语句 + +- 格式 + +```java +switch (表达式) { + case 1: + 语句体1; + break; + case 2: + 语句体2; + break; + ... + default: + 语句体n+1; + break; +} +``` + +- 执行流程: + +​ 首先,计算出表达式的值。 + +​ 其次,和case依次比较,一旦有对应的值,就会执行相应的语句,在执行的过程中,遇到 break就会结束。 + +​ 最后,如果所有的case都和表达式的值不匹配,就会执行default语句体部分,然后程序结束掉。 + +#### 1.2 switch案例-减肥计划 + +- 需求:键盘录入星期数,显示今天的减肥活动 + +```java +周一:跑步 +周二:游泳 +周三:慢走 +周四:动感单车 +周五:拳击 +周六:爬山 +周日:好好吃一顿 +``` + +- 示例代码: + +```java +public static void main(String[] args){ + // 1. 键盘录入星期数据,使用变量接收 + Scanner sc = new Scanner(System.in); + System.out.println("请输入"); + int week = sc.nextInt(); + // 2. 多情况判断,采用switch语句实现 + switch(week){ + // 3. 在不同的case中,输出对应的减肥计划 + case 1: + System.out.println("跑步"); + break; + case 2: + System.out.println("游泳"); + break; + case 3: + System.out.println("慢走"); + break; + case 4: + System.out.println("动感单车"); + break; + case 5: + System.out.println("拳击"); + break; + case 6: + System.out.println("爬山"); + break; + case 7: + System.out.println("好好吃一顿"); + break; + default: + System.out.println("您的输入有误"); + break; + } + } +} +``` + +#### 1.3 switch语句case穿透 + +- 概述 : 如果switch语句中,case省略了break语句, 就会开始case穿透 +- 需求 : 键盘录入星期数,输出工作日、休息日 (1-5)工作日,(6-7)休息日 +- 示例代码: + +```java +/* +case穿透是如何产生的? + 如果switch语句中,case省略了break语句, 就会开始case穿透. + 现象: + 当开始case穿透,后续的case就不会具有匹配效果,内部的语句都会执行 + 直到看见break,或者将整体switch语句执行完毕,才会结束。 +*/ +public static void main(String[] args){ + Scanner sc = new Scanner(System.in); + System.out.println("请输入星期数:"); + int week = sc.nextInt(); + switch(week){ + case 1: + case 2: + case 3: + case 4: + case 5: + System.out.println("工作日"); + break; + case 6: + case 7: + System.out.println("休息日"); + break; + default: + System.out.println("您的输入有误"); + break; + } + } +} +``` + + + +## 作业 + +1. 某市不同车牌的出租车3千米的起步价和计费分别为:夏利3元,3千米以外,2.1元/千米;康富4元,3千米以外,2.4元/千米;桑塔纳5元,3千米以外,2.7元/千米。编程实现从键盘输入乘车的车型及行车千米数,输出应付车费。 + +```java +import java.util.Scanner; + +public class class1 { + public static void main(String[] args) { + Scanner sc=new Scanner(System.in); + System.out.println("请输入车型:"); + String model=sc.next(); + System.out.println("请输入行车千米数:"); + Double kilometer=sc.nextDouble(); + double price=0; + switch (model){ + case "夏利": + if (kilometer<=3) { + price=3; + }else { + price=3+2.1*(kilometer-3); + } + break; + case "康富": + if (kilometer<=3) { + price=4; + }else { + price=3+2.4*(kilometer-3); + } + break; + case "桑塔纳": + if (kilometer<=3) { + price=5; + }else { + price=3+2.7*(kilometer-3); + } + break; + default: + System.out.println("车型不正确!"); + } + System.out.println("车型:"+model+",行车千米数:"+kilometer+",应付车费:"+price); + } +} +``` + +2. 使用switch和if语句算出今天是今年的第几天(提示:以3月3日为例,应该先把前两个月的天数加起来,然后再加上3天即为本年的第几天;需要考虑闰年的情况,如果输入的年份是闰年且输入的月份大于或等于3,需要在多加1天。) + +```java +import java.util.Scanner; + +public class class2 { + public static void main(String[] args) { + Scanner sc=new Scanner(System.in); + System.out.println("请输入今年年份:"); + int year=sc.nextInt(); + System.out.println("请输入本月月份:"); + int month=sc.nextInt(); + System.out.println("请输入今天日期:"); + int day=sc.nextInt(); + int sum=0; + switch (month){ + case 12: + sum+=30; + case 11: + sum+=31; + case 10: + sum+=30; + case 9: + sum+=31; + case 8: + sum+=31; + case 7: + sum+=30; + case 6: + sum+=31; + case 5: + sum+=30; + case 4: + sum+=31; + case 3: + if (year%4==0 && year%100==0 || year%400==0){ + sum+=29; + }else { + sum+=28; + } + sum+=day; + case 2: + sum+=31; + case 1: + + break; + } + System.out.println("今天是"+year+"年"+month+"月"+day+"日,是今年第"+sum+"天。"); + } +} +``` + +2. 编写一个程序,根据用户输入的一个字符,判断该字符是不是字母,如果是字母,判断该字母是声母还是韵母,是大写字母还是小写字母;如果不是字母,这输出“你输入的字符不是字母”。 + +```java +import java.util.Scanner; + +public class class3 { + public static void main(String[] args) { + Scanner sc=new Scanner(System.in); + System.out.println("请输入一个字符:"); + char zifu=sc.next().charAt(0); + if (zifu>='a' && zifu<='z' || zifu>='A' && zifu<='Z'){ + switch (zifu){ + case 'a': + case 'e': + case 'i': + case 'o': + case 'u': + System.out.println(zifu+"为小写韵母"); + break; + case 'A': + case 'E': + case 'I': + case 'O': + case 'U': + System.out.println(zifu+"为大写韵母"); + break; + case 'b': + case 'c': + case 'd': + case 'g': + case 'h': + case 'j': + case 'k': + case 'l': + case 'm': + case 'n': + case 'p': + case 'q': + case 'r': + case 's': + case 't': + case 'v': + case 'w': + case 'x': + case 'y': + case 'z': + System.out.println(zifu+"是小写声母"); + break; + default: + System.out.println(zifu+"是大写声母"); + break; + } + }else{ + System.out.println("你输入的字符不是字母"); + } + } + } +``` + diff --git "a/03 \345\276\220\351\233\250\346\231\264/images/12.02/1.PNG" "b/03 \345\276\220\351\233\250\346\231\264/images/12.02/1.PNG" new file mode 100644 index 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<2137161545@qq.com> Date: Wed, 7 Dec 2022 22:17:40 +0800 Subject: [PATCH 3/3] =?UTF-8?q?while=E8=AF=AD=E5=8F=A5=E5=88=86=E6=94=AF?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...25\357\274\210\344\270\211\357\274\211.md" | 371 ++++++++++++++++++ 1 file changed, 371 insertions(+) diff --git "a/03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" "b/03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" index 7f65a7a..d65548a 100644 --- "a/03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" +++ "b/03 \345\276\220\351\233\250\346\231\264/20221202 \345\237\272\347\241\200\350\257\255\346\263\225\357\274\210\344\270\211\357\274\211.md" @@ -121,6 +121,377 @@ public static void main(String[] args){ } ``` +### 2.for循环 + +2.1 循环语句-for循环 + +- 循环: + + 循环语句可以在满足循环条件的情况下,反复执行某一段代码,这段被重复执行的代码被称为循环代码体语句,当反复执行这个循环体时,需要在合适的时候把循环判断条件修改为false,从而结束循环,否则循环将一直执行下去,形成死循环。 + +- for循环格式: + +```java +for (初始化语句;条件判断语句;条件控制语句){ + 循环体语句; +} +``` + +- 格式解释: + + - 初始化语句:用于表示循环开启时的起始状态,就是循环开始的时候什么样 + + - 条件判断语句:用于表示循环反复执行的条件,就是判断循环是否能一直执行下去 + + - 循环体语句:用于表示循环反复执行的内容,就是循环反复执行的事情 + + - 条件控制语句:用于表示循环每次执行的变化内容,就是控制循环是否能执行下去 + +- 执行流程: + + * 执行初始化语句 + + * 执行条件判断语句,看其结果时true还是false + + 如果是false,循环结束 + + 如果是true,继续执行 + + * 执行循环体语句 + + * 执行条件控制语句 + + * 返回条件判断语句继续执行 + +#### 2.2 for循环案例——输出数据1-5和倒序5-1 + +需求:在控制台输出1-5和5-1的数据 + +示例代码: + +```java +public class for_test01 { + public static void main(String[] args) { + //需求:输出数据1-5 + for (int n=1;n<=5;n++){ + System.out.println(n); + } + System.out.println("--------"); + //需求:输出数据5-1 + for (int n=5;n>=1;n--){ + System.out.println(n); + } + } +} +``` + +#### 2.3 循环案例——求1-5的数据和 + +- 需求:求1-5之间的数据和,并把求和结果在控制台输出 +- 示例代码: + +```java +public class for_test02 { + public static void main(String[] args) { + //求和的最终结果必须保存起来,需要定义一个变量,用于保存求和的结果,初始化为0 + int sum=0; + //从1开始到5结束,使用循环结构完成 + for (int i=1;i<=5;i++){ + //将反复进行的事情写入循环结构内部 + //此处反复进行的事情是将数据i加到用于保存最终求和的变量sum中 + sum+=i; + //sum=sum+i 简写 sum+= + } + //当循环执行完毕时,将最终数据打印出来 + System.out.println("1-5之间的数据和为:"+sum); + } +} +``` + +- 本题要点: + * 今后遇到的需求中,如果带有求和二字,应立即联想到求和变量 + * 求和变量的定义位置,必须在循环外部,如果在内部则计算出的数据将是错误的 + +#### 2.4 for循环案例——求1-100之间的偶数和 + +- 需求:求1-100之间的偶数和,并把求和结果在控制台输出 +- 示例代码: + +```java +public class for_test03 { + public static void main(String[] args) { + //求和的最终结果必须保存起来,需要定义一个变量,用于保存求和的结果,初始值为0 + int sum=0; + //对1-100的数据求和与1-5的数据求和几乎完全一样,仅仅是结果条件的不同 + for (int i=1;i<=100;i++){ + if (i % 2 == 0) { + sum+=i; + } + } + //当循环执行完毕时,将最终结果打印出来 + System.out.println("1-100之间的偶数和为:"+sum); + } +} +``` + +#### 2.5 for循环案例-水仙花数 + +- 需求:在控制台输出所有的“水仙花数” + +- 解释:什么是水仙花数? + - 水仙花数,指的是一个三位数,个位、十位、百位的数字立方和等于原数 + - 例如 153 3*3*3 + 5*5*5 + 1*1*1 = 153 + +- 思路: + - 获取所有的三位数,准备进行筛选,最小的三位数为100,最大的三位数为999,使用for循环获取 + - 获取每一个三位数的个位,十位,百位,做if语句判断是否是水仙花数 + +- 示例代码 + +```java +public class for_test04 { + public static void main(String[] args) { + //输出所有的水仙花数必然要使用到循环,遍历所有的三位数,三位数从100开始,到999结束 + for(int i=100; i<1000; i++) { + //在计算之前获取三位数中每个位上的值 + int ge = i%10; + int shi = i/10%10; + int bai = i/10/10%10; + //判定条件是将三位数中的每个数值取出来,计算立方和后与原始数字比较是否相等 + if(ge*ge*ge + shi*shi*shi + bai*bai*bai == i) { + //输出满足条件的数字就是水仙花数 + System.out.println(i); + } + } + } +} +``` + +#### 2.6 for循环案例-每行打印2个水仙花数(统计) + +- 需求:在控制台输出所有的“水仙花数”,要求每行打印2个 +- 示例代码: + +```java +public class for_test05 { + /* + 需求:在控制台输出所有的“水仙花数”,要求每行打印2个 + System.out.print (打印内容); 打印后不换行 + System.out.println(打印内容); 打印后换行 + 分析: + 1. 定义变量count,用于保存“打印过”的数量,初始值为0 + 2. 在判定和打印水仙花数的过程中,拼接空格, 但不换行,并在打印后让count变量 + +1,记录打印过的数量 + 3. 在每一次count变量+1后,判断是否到达了2的倍数,是的话,换行。 + */ + public static void main(String[] args){ + // 1. 定义变量count,用于保存“打印过”的数量,初始值为0 + int count = 0; + for(int i = 100; i <= 999; i++){ + int ge = i % 10; + int shi = i / 10 % 10; + int bai = i / 10 / 10 % 10; + if( (ge*ge*ge + shi*shi*shi + bai*bai*bai) == i){ + // 2. 在判定和打印水仙花数的过程中,拼接空格, 但不换行,并在打印后让count变量+1,记录打印过的数量 + System.out.print(i + " "); + count++; + // 3. 在每一次count变量+1后,判断是否到达了2的倍数,是的话,换行 + if(count % 2 == 0){ + System.out.println(); + } + } + } + } +} +``` + +- 本题要点: + - 今后如果需求带有统计xxx,请先想到计数器变量 + - 计数器变量定义的位置,必须在循环外部 + +### 3.while循环 + +#### 3.1 循环语句-while循环 + +```java +初始化语句; +while (条件判断语句) { +循环体语句; +条件控制语句; +} +``` + +- while循环执行流程: + +​ ①执行初始化语句 +​ ②执行条件判断语句,看其结果是true还是false + 如果是false,循环结束 + 如果是true,继续执行 + +​ ③执行循环体语句 +​ ④执行条件控制语句 +​ ⑤回到②继续 + +- 示例代码: + +```java +public class WhileDemo { + public static void main(String[] args) { + //需求:在控制台输出5次"HelloWorld" + //for循环实现 + for(int i=1; i<=5; i++) { + System.out.println("HelloWorld"); + } + System.out.println("--------"); + //while循环实现 + int j = 1; + while(j<=5) { + System.out.println("HelloWorld"); + j++; + } + } +} +``` + +#### 3.2 while循环案例-珠穆朗玛峰 + +- 需求:世界最高山峰是珠穆朗玛峰(8844.43米=8844430毫米),假如我有一张足够大的纸,它的厚度是0.1毫米。请问,我折叠多少次,可以折成珠穆朗玛峰的高度? +- 示例代码: + +```java +public class WhileTest { + public static void main(String[] args) { + //定义一个计数器,初始值为0 + int count = 0; + //定义纸张厚度 + double paper = 0.1; + //定义珠穆朗玛峰的高度 + int zf = 8844430; + //因为要反复折叠,所以要使用循环,但是不知道折叠多少次,这种情况更适合使用while循环 + //折叠的过程中当纸张厚度大于珠峰就停止了,因此继续执行的要求是纸张厚度小于珠峰高度 + while(paper <= zf) { + //循环的执行过程中每次纸张折叠,纸张的厚度要加倍 + paper *= 2; + //在循环中执行累加,对应折叠了多少次 + count++; + } + //打印计数器的值 + System.out.println("需要折叠:" + count + "次"); + } +} +``` + +### 4.循环细节 + +#### 4.1 循环语句-do whilexunhuan + +- 完整格式: + +```java +初始化语句; +do { + 循环体语句; + 条件控制语句; +}while(条件判断语句); +``` + +- 执行流程: + +​ ① 执行初始化语句 + +​ ② 执行循环体语句 + +​ ③ 执行条件控制语句 + +​ ④ 执行条件判断语句,看其结果是true还是false + +​ 如果是false,循环结束 + +​ 如果是true,继续执行 + +​ ⑤ 回到②继续 + +- 示例代码: + +```java +public class DoWhileDemo { + public static void main(String[] args) { + //需求:在控制台输出5次"HelloWorld" + //for循环实现 + for(int i=1; i<=5; i++) { + System.out.println("HelloWorld"); + } + System.out.println("--------"); + //do...while循环实现 + int j = 1; + do { + System.out.println("HelloWorld"); + j++; + }while(j<=5); + } +} +``` + +#### 4.2 三种循环的区别 + +- 三种循环的区别 + - for循环和while循环先判断条件是否成立,然后决定是否执行循环体(先判断后执行) + - do...while循环先执行一次循环体,然后判断条件是否成立,是否继续执行循环体(先执行后判断) +- for循环和while的区别 + - 条件控制语句所控制的自增变量,因为归属for循环的语法结构中,在for循环结束后,就不能再次被访问到了 + - 条件控制语句所控制的自增变量,对于while循环来说不归属其语法结构中,在while循环结束后,该变量还可以继续使用 +- 死循环(无限循环)的三种格式 + 1. for(;;){} + 2. while(true){} + 3. do {} while(true); + +#### 4.3 死循环 + +- 死循环格式 + +```java +for死循环格式 : +for(;;){ + +} + +while死循环格式 : +while(true){ + +} +do..while死循环格式 : +do{ + +}while(true); +``` + +- 死循环案例: + +```java +/* + 问题: 死循环有应用场景吗? + 例如: 键盘录入一个1-100之间的整数 + 顾虑: 键盘录入是用户操作的, 用户就可能会出现一些误操作的现象 +*/ +public static void main(String[] args) { + /* + for(;;){ + System.out.println("我停不下来了~"); + } + */ + /* + while(true){ + System.out.println("我停不下来了~"); + } + */ + do{ + System.out.println("我停不下来了~"); + }while(true); + System.out.println("看看我能被执行吗?~"); // 无法访问的语句 +} +} +``` + ## 作业 -- Gitee