day01

JavaSe/day01/HelloWorld.java

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+public class  HelloWorld {
+    public static void main(String[] args ){
+        System.out.println("HelloWorld");
+    }
+}

JavaSe01/.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

JavaSe01/.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" defaultCharsetForPropertiesFiles="UTF-8">
+    <file url="PROJECT" charset="UTF-8" />
+  </component>
+</project>

JavaSe01/.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

JavaSe01/.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/JavaSe01.iml" filepath="$PROJECT_DIR$/JavaSe01.iml" />
+      <module fileurl="file://$PROJECT_DIR$/day01/day01.iml" filepath="$PROJECT_DIR$/day01/day01.iml" />
+      <module fileurl="file://$PROJECT_DIR$/day02/day02.iml" filepath="$PROJECT_DIR$/day02/day02.iml" />
+    </modules>
+  </component>
+</project>

JavaSe01/JavaSe01.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="GENERAL_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

JavaSe01/day01/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

JavaSe01/day01/day01.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="17" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

JavaSe01/day01/src/HelloWorld.java

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+public class HelloWorld {
+    //快捷键 主函数 psvm  |  main
+    public static void main(String[] args) {
+        //输出
+        System.out.println("HelloWorld");
+    }
+}

JavaSe01/day01/src/Test01.java

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+/**
+ * ClassName: Test01
+ * Package: PACKAGE_NAME
+ * Description:
+ *
+ * @Author 爱扣钉-陈晨
+ * @Create 2023/9/3 16:04
+ * @Version 1.0
+ */
+public class Test01 {
+    public static void main(String[] args) {
+        //字面量
+
+        //小数
+        System.out.println(1.1);
+
+        //整数
+        System.out.println(1000);
+
+        //文本  字符串
+        System.out.println("hello world");
+
+        //字符 单引号 包裹 只有一个字符
+        System.out.println('男');
+
+        //布尔 true 真 false 假
+        System.out.println(true);
+
+    }
+}

JavaSe01/day01/src/Test02.java

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+/**
+ * ClassName: Test01
+ * Package: PACKAGE_NAME
+ * Description:
+ *
+ * @Author 爱扣钉-陈晨
+ * @Create 2023/9/3 16:04
+ * @Version 1.0
+ */
+public class Test02 {
+    public static void main(String[] args) {
+        //变量
+        //数据类型  名称  =  值
+        //手机描述
+        String name = "华为meta60pro";
+        int price = 6999;
+        double weight = 200.13;
+        char isFlag = '是';
+        boolean isOn = true;
+
+        System.out.println("名称:"+name);
+        System.out.println("价格:"+price);
+        System.out.println("重量:"+weight);
+        System.out.println("是否售卖:"+isFlag);
+        System.out.println("是否上架:"+isOn);
+
+        //先赋值 在使用
+        int age = 20;
+
+        //int age = 30;
+
+        System.out.println(age);
+
+        {
+            System.out.println(age);
+
+            int a  =20;
+        }
+        //System.out.println(a);
+
+
+        int a , b , c ; //不推荐
+
+
+        int d  = 30;
+        //byte i = 128;
+
+        //栈  名称  = 20 在栈开辟一块空间 4字节
+    }
+}

JavaSe01/day02/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

JavaSe01/day02/day02.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="17" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

JavaSe01/day02/src/Main.java

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+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}