From a573a5f6099562daf051c038dfdaa0f27c3805c2 Mon Sep 17 00:00:00 2001 From: Administrator <1502024759@qq.com> Date: Tue, 28 May 2024 20:06:46 +0800 Subject: [PATCH 1/2] =?UTF-8?q?feat:=E6=8F=90=E4=BA=A4=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../DateDomo.java" | 17 ++++++++ .../MathDomo.java" | 37 +++++++++++++++++ .../Person.java" | 30 ++++++++++++++ .../StringDomo.java" | 40 +++++++++++++++++++ 4 files changed, 124 insertions(+) create mode 100644 "work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/DateDomo.java" create mode 100644 "work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/MathDomo.java" create mode 100644 "work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/Person.java" create mode 100644 "work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/StringDomo.java" diff --git "a/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/DateDomo.java" "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/DateDomo.java" new file mode 100644 index 0000000..064c31f --- /dev/null +++ "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/DateDomo.java" @@ -0,0 +1,17 @@ +package com.java.minxi.java_20240516.java_2302_刘波_3244310221; +import java.text.ParseException; +import java.text.SimpleDateFormat; +import java.util.Date; + +public class DateDomo { + public static void main(String[] args) throws ParseException { + + Date dateFormat = new Date("2024-05-21"); + System.out.println(dateFormat); + Date date1 = new Date(); + System.out.println(date1); + SimpleDateFormat date = new SimpleDateFormat("wwww-ss-dd"); + Date mydate = date.parse("2024-05-21"); + System.out.println(mydate); + } +} diff --git "a/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/MathDomo.java" "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/MathDomo.java" new file mode 100644 index 0000000..45311df --- /dev/null +++ "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/MathDomo.java" @@ -0,0 +1,37 @@ +package com.java.minxi.java_20240516.java_2302_刘波_3244310221; +import java.util.Random; +import java.util.Scanner; + +public class MathDomo { + public static void main(String[] args) { + System.out.println("输入一个数字"); + Scanner scanner = new Scanner(System.in); + float one = scanner.nextFloat(); + System.out.println("绝对值为：" + Math.abs(one)); + System.out.println("输入三个数据"); + int twoone=scanner.nextInt(); + int twotwo=scanner.nextInt(); + int twothree=scanner.nextInt(); + int max =Math.max((Math.max(twoone,twotwo)),twothree); + int min =Math.min((Math.min(twoone,twotwo)),twothree); + System.out.println("最大值为："+max); + System.out.println("最小值为："+min); + System.out.println("输入一个浮点数"); + float three=scanner.nextFloat(); + System.out.println("四舍五入为："+Math.round(three)); + + Random random =new Random(); + for (int i = 0; i < 2; i++) { + System.out.println(random.nextInt(2)); + } + int [] arr={1,2,9}; + avg(arr); + } + public static double avg(int[] arr) { + int sum=0; + for (int i = 0; i < arr.length; i++) { + sum=sum+i; + } + return sum/arr.length; + } +} diff --git "a/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/Person.java" "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/Person.java" new file mode 100644 index 0000000..92b7159 --- /dev/null +++ "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/Person.java" @@ -0,0 +1,30 @@ +package com.java.minxi.java_20240516.java_2302_刘波_3244310221; + +import java.util.Objects; + +public class Person { + String name; + int age; + + @Override + public String toString() { + return "Person{" + + "name='" + name + '\'' + + ", age=" + age + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + Person person = (Person) o; + return age == person.age && Objects.equals(name, person.name); + } + + @Override + public int hashCode() { + return Objects.hash(name, age); + + } +} diff --git "a/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/StringDomo.java" "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/StringDomo.java" new file mode 100644 index 0000000..782393e --- /dev/null +++ "b/work/com/java/minxi/java_20240516/java_2302_\345\210\230\346\263\242_3244310221/StringDomo.java" @@ -0,0 +1,40 @@ +package com.java.minxi.java_20240516.java_2302_刘波_3244310221; + +public class StringDomo { + public static void main(String[] args) { + String a = "A"; + String b = "B"; + System.out.println(a + b); + String name = "the one"; + System.out.println(name.length()); + String first = "the first the second"; + String second = ","; + int start = 0, end; + end = first.indexOf(second, start); + while (end != -1) { + String split = first.substring(start, end); + System.out.println(split); + start = end + 1; + end = first.indexOf(second, start); + } + String speed =first.substring(start); + System.out.println(speed); + String c="C"; + System.out.println(c); + + String Four="ac".toUpperCase(); + System.out.println(Four); + + String E="ssss"; + System.out.println(E.contains("si")); + + String F="汤姆"; + String G=F.replace("汤","姆"); + System.out.println(G); + + + String H=new String("BOBO" ); + String J=H.replace("o","e"); + System.out.println(J); + } +} -- Gitee From b3f8192f80dcad0c8efb35490ee499706b1802ec Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=88=98=E6=B3=A2?= <1502024759@qq.com> Date: Wed, 29 May 2024 11:43:49 +0800 Subject: [PATCH 2/2] =?UTF-8?q?feat=EF=BC=9B=E6=8F=90=E4=BA=A45.24?= =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../Main.java" | 70 +++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 "work/com/java/minxi/java_20240524/java_2302_\345\210\230\346\263\242_3244310221/Main.java" diff --git "a/work/com/java/minxi/java_20240524/java_2302_\345\210\230\346\263\242_3244310221/Main.java" "b/work/com/java/minxi/java_20240524/java_2302_\345\210\230\346\263\242_3244310221/Main.java" new file mode 100644 index 0000000..20b298e --- /dev/null +++ "b/work/com/java/minxi/java_20240524/java_2302_\345\210\230\346\263\242_3244310221/Main.java" @@ -0,0 +1,70 @@ +package com.java.minxi.java_20240524.java_2302_刘波_3244310221; + +public class Main { + public static void main(String[] args) throws Exception { + Demo1(); + Demo2(); + Demo3(); + } + public static void Demo1() throws Exception{ + Class.forName("com.mysql.cj.jdbc.Driver"); + String url = "jdbc:mysql:///student?serverTimezone=Asia/Shanghai"; + String username = "root"; + String password = "123456"; + Connection conn = DriverManager.getConnection(url, username, password); + String sql = "select * from teacher_info;"; + Statement stmt = conn.createStatement(); + ResultSet resultSet = stmt.executeQuery(sql); + System.out.println("所有用户信息:"); + System.out.println("id\t\tteacher_name\tteacher_age"); + while (resultSet.next()){ + int id = resultSet.getInt("id"); + String name = resultSet.getString("teacher_name"); + int age = resultSet.getInt("teacher_age"); + System.out.println(id+"\t\t"+name+"\t\t\t"+age); + } + System.out.println(); + resultSet.close(); + stmt.close(); + conn.close(); + } + private static void Demo2() throws Exception{ + String url = "jdbc:mysql:///student?serverTimezone=Asia/Shanghai"; + String username = "root"; + String password = "123456"; + Connection conn = DriverManager.getConnection(url, username, password); + String sql = "select * from teacher_info where id = 1 && teacher_age = 35;"; + Statement stmt = conn.createStatement(); + ResultSet resultSet = stmt.executeQuery(sql); + System.out.println("id为1，且年龄为35岁的用户:"); + System.out.println("id\t\tteacher_name\tteacher_age"); + while (resultSet.next()){ + int id = resultSet.getInt(1); + String name = resultSet.getString(2); + int age = resultSet.getInt(3); + System.out.println(id+"\t\t"+name+"\t\t\t"+age); + } + System.out.println(); + resultSet.close(); + stmt.close(); + conn.close(); + } + + private static void Demo3() throws Exception { + String url = "jdbc:mysql:///student?serverTimezone=Asia/Shanghai"; + String username = "root"; + String password = "123456"; + Connection conn = DriverManager.getConnection(url, username, password); + String sql = "update teacher_info set teacher_name = '小严肃' where id = 3;"; + Statement stmt = conn.createStatement(); + int i = stmt.executeUpdate(sql); + if (i > 0) { + System.out.println("执行成功"); + } else { + System.out.println("执行失败"); + } + stmt.close(); + conn.close(); + } + +} -- Gitee