diff --git "a/44 \344\273\243\347\221\236/20221214 java\346\225\260\347\273\204.md" "b/44 \344\273\243\347\221\236/20221214 java\346\225\260\347\273\204.md" new file mode 100644 index 0000000000000000000000000000000000000000..d20ae9669e6443351beeb975e64445e0777142dc --- /dev/null +++ "b/44 \344\273\243\347\221\236/20221214 java\346\225\260\347\273\204.md" @@ -0,0 +1,77 @@ +## 第一题 + +```java +public class work { + public static void main(String[] args) { + for (int m=9;m>=1;m--){ + System.out.println(); + + for (int n=9;n>=m;n--){ + System.out.print(n+"*"+m+"="+(n*m)+"\t"); + } + } + // int count=0; +// for (int m=1;m<=5;m++){ +// for (int i=0;i<5;i++){ +// if ((m+i)%2==1){ +// System.out.print("*\t"); +// }else { +// System.out.print("#\t"); +// } +//// System.out.print("*\t"); +// } +// System.out.println(); +// } + } +} +``` + +## 第二题 + +```java +public class work1 { + public static void main(String[] args) { +// 账户余额 一档阶梯(0-240:3.375元/方) 充值 +// 二档阶梯(241-360:4.05元/方) +// 三档阶梯(361-99999999:5.06元/方)如遇燃气销售价格调整时，按物价局气价调整批文执行燃气价格，分别结算调价前后的燃气费。 +// 50 300 +// 确认 不再提醒 +// 100 +// 气价明细 购气金额:￥445.40 + //假设第三梯度为X + for(int x=1;x<=100;x++){ + if(x*4.05+(100-x)*5.06==445.40){ + System.out.println("二档为" + x + "三档为" + (100-x)); + break; + } + } + + } + } +``` + +## 笔记 + +| 输出数组的所有元素内容第三种方法 | | | +| -------------------------------- | ------------------------------------------------------------ | :----------------------------------------------------------: | +| | [4](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_4) | | +| | [5](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_5) | java | +| | [6](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_6) | //语法 Arrays.toString(数组名) | +| | [7](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_7) | **System**.out.println(**Arrays**.toString(scores)); | +| | [8](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_8) | | +| | [9](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_9) | | +| | [10](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_10) | **最大值最小值：习惯上将数组的第一个元素，设为最大或最小的变量** | +| | [11](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_11) | | +| | [12](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_12) | java | +| | [13](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_13) | **int** max=scores[0],min=scores[0]//scores[]是数组 | +| | [14](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_14) | | +| | [15](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_15) | | +| | [16](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_16) | ***\*字符串一旦被定义就不能改变，数组不可以，但不可以和另一种定义方式一起\**** | +| | [17](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_17) | | +| | [18](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_18) | java | +| | [19](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_19) | **String** a="abc"; | +| | [20](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_20) | **String** b=a; | +| | [21](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_21) | b="bcd"; | +| | [22](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_22) | **System**.out.println(a);//abc.因为字符串一旦定义就不能改变 | +| | [23](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_23) | | +| | [24](https://gitee.com/class-22-class-02/java-base/pulls/339/files#fdca5f814c7487e7f9f74f01fe41ae9c5f1d12f4_0_24) | **String** newPwd = **new** **String**(original:"abc");//另一种定义方式 | \ No newline at end of file diff --git "a/44 \344\273\243\347\221\236/20221217 java\346\226\271\346\263\225.md" "b/44 \344\273\243\347\221\236/20221217 java\346\226\271\346\263\225.md" new file mode 100644 index 0000000000000000000000000000000000000000..a21e88cdae64e256e32f3509352d9a6ac32e48bd --- /dev/null +++ "b/44 \344\273\243\347\221\236/20221217 java\346\226\271\346\263\225.md" @@ -0,0 +1,69 @@ +## 第一题 + +```java +import java.util.Scanner; +/*定义一个函数，用于求2个书中的较大数，并将其返回，这2个数子在主函数由用户数入 + */ +public class work2 { + public static void main(String[] args) { +int c=num(165,465); + System.out.println(c); + + } + + public static int num(int a,int b){ + Scanner sc=new Scanner(System.in); + System.out.println("请输入数字一"); + int num= sc.nextInt(); + System.out.println("请输入数字二"); + int num1=sc.nextInt(); +if (num>num1){ +return num; +}else { + int c=b