diff --git a/Java.md b/Java-基础.md similarity index 73% rename from Java.md rename to Java-基础.md index 99b4a5f..08eaaf2 100644 --- a/Java.md +++ b/Java-基础.md @@ -172,7 +172,7 @@ static：类名可调用static修饰的方法，对于抽象方法无意义 可以通过子类进行访问 -4.抽象类的子类 +4.抽象类的子类 要么重写所有抽象方法，要么本身就是抽象类 @@ -422,3 +422,132 @@ class im implements inter{ ## 窗体，组件，事件： +```java +package com.icecat.frame; +/* + .*意思补充，意为加载前者类下所有的包 + */ +import javax.swing.*; + +public class FrameTest1 { + public static void main(String[] args) { +// 创建窗体对象 + JFrame frame = new JFrame(); +// 设置窗体尺寸 + frame.setSize(1920,1080); +// 设置窗体关闭模式，可以直接写数字1，2，3.WindowConstants.EXIT_ON_CLOSE=3，意思是关闭窗口同时关闭java虚拟机。如果不写默认为隐藏窗口 + frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); +// 设置标题 + frame.setTitle("猫瑾醒了吗丶到窗体一游"); +// 设置窗体可见 注意：一定要最后设置窗体可见，要让在此之前的图片按钮的功能加载好后最后展示窗体 + frame.setVisible(true); + } +} +``` + +效果展示： + +image-20250324154858456 + +### 窗体添加按钮： + +```java +package com.icecat.frame; + +import javax.swing.*; +/* +JButton构造方法： + public JButton():创建一个空白按钮 + public JButton(String text):创建一个带文本的按钮 + */ +public class JbuttonTest1 { + public static void main(String[] args) { + JFrame frame = new JFrame(); +// 设置按钮前需要先取消按钮默认布局 + frame.setLayout(null); +// 创建按钮对象 + JButton btn = new JButton("不要点我"); +// 设置按钮位置以及大小 + btn.setBounds(175,225,100,100); +// 将按钮添加到窗体的（面板对象）中 + frame.getContentPane().add(btn); + frame.setSize(400,500); + frame.setDefaultCloseOperation(3); + frame.setVisible(true); + } +} +``` + +### 窗体添加图片，文字： + +```java +package com.icecat.frame; + +import javax.swing.*; + +public class JlableTest1 { + public static void main(String[] args) { + JFrame frame = new JFrame(); + frame.setSize(1200,1000); + frame.setDefaultCloseOperation(3); + frame.setLayout(null); +// Jlable展示文本和图片 先创建Jlabel对象 +// 1.展示文本 + JLabel jl1 = new JLabel("薇尔莉特"); + jl1.setBounds(100,50,60,60); + frame.getContentPane().add(jl1); + JLabel jl2 = new JLabel("小鸟游六花"); + jl2.setBounds(160,50,80,60); + frame.getContentPane().add(jl2); +// 2，展示图像 + JLabel jl1_1jpg = new JLabel(new ImageIcon("D:\\Develop\\Advanced-codes\\day09-codes\\src\\com\\icecat\\可愛い.jpg")); + jl1_1jpg.setBounds(100,110,690,690); + frame.getContentPane().add(jl1_1jpg); +// 展示窗体 + frame.setVisible(true); + } +} +``` + +![image-20250324163631116](https://gitee.com/icecat2233/picture/raw/master/20250324163633329.png) + +### 事件监听： + +分为两个 + +#### ActionListener:动作监听 + +![image-20250324171058759](https://gitee.com/icecat2233/picture/raw/master/20250324171225177.png) + +#### KeyListener：键盘监听 + +![image-20250324171222985](https://gitee.com/icecat2233/picture/raw/master/20250324171229810.png) + +#### 注意事项 + +1：**其中键盘监听中：** + +如何确定键盘录入按键（ASCII码） + +并且第一个keyTyped方法不常用，因为有些方法监听不到 + +2：**监听冲突问题** + +焦点：程序的注意力集中在了某一组件上 + +注意：按钮组件比较特殊，创建好后就自动聚焦，但是并不需要，还可能会和键盘监听起冲突问题 + +可以通过：`setFocusable(false)`来取消焦点 + +![image-20250327162545003](https://gitee.com/icecat2233/picture/raw/master/20250327162557075.png) + +### 适配器设计模式 + +image-20250327163802452 + +### 模板设计模式 + +image-20250327165742040 + +**优势：已经定义了通用结构，使用者只需关心自己需要实现的功能即可** + diff --git a/README.md b/README.md index a8fbf94..3cdaeb1 100644 --- a/README.md +++ b/README.md @@ -4,6 +4,8 @@ 此文档目前仅记录了javaSE内容，较为基础，适合很初级的人去看，后续会继续提交更新的笔记，会持续更新 +java基础部分结束后，后续内容会一个重点一个文档的形式进行更新，最新为：常用api + ![可愛い](https://gitee.com/icecat2233/picture/raw/master/20250321231214432.jpg) -![image-20250321231558551](https://gitee.com/icecat2233/picture/raw/master/20250321231909450.png) +image-20250321231558551 diff --git a/imgh/image-20250324154121720.png b/imgh/image-20250324154121720.png new file mode 100644 index 0000000..69a2ab7 Binary files /dev/null and b/imgh/image-20250324154121720.png differ diff --git a/imgh/image-20250324154858456.png b/imgh/image-20250324154858456.png new file mode 100644 index 0000000..2eef5ca Binary files /dev/null and b/imgh/image-20250324154858456.png differ diff --git a/imgh/image-20250324163631116.png b/imgh/image-20250324163631116.png new file mode 100644 index 0000000..2fad52c Binary files /dev/null and b/imgh/image-20250324163631116.png differ diff --git a/imgh/image-20250324171058759.png b/imgh/image-20250324171058759.png new file mode 100644 index 0000000..f6b85ba Binary files /dev/null and b/imgh/image-20250324171058759.png differ diff --git a/imgh/image-20250324171222985.png b/imgh/image-20250324171222985.png new file mode 100644 index 0000000..6609df5 Binary files /dev/null and b/imgh/image-20250324171222985.png differ diff --git a/imgh/image-20250327162545003.png b/imgh/image-20250327162545003.png new file mode 100644 index 0000000..e34029a Binary files /dev/null and b/imgh/image-20250327162545003.png differ diff --git a/imgh/image-20250327163802452.png b/imgh/image-20250327163802452.png new file mode 100644 index 0000000..d188373 Binary files /dev/null and b/imgh/image-20250327163802452.png differ diff --git a/imgh/image-20250327165742040.png b/imgh/image-20250327165742040.png new file mode 100644 index 0000000..8a950f2 Binary files /dev/null and b/imgh/image-20250327165742040.png differ diff --git a/imgh/image-20250401155734366.png b/imgh/image-20250401155734366.png new file mode 100644 index 0000000..4656a5d Binary files /dev/null and b/imgh/image-20250401155734366.png differ diff --git a/常用api.md b/常用api.md new file mode 100644 index 0000000..bb55615 --- /dev/null +++ b/常用api.md @@ -0,0 +1,46 @@ +# 常用API + +## Object类 + +### toString方法 + +`public String toString()`默认是返回当前对象再堆内存中的地址信息：类的全类名@十六进制哈希值 + +#### 用途： + +在开发过程中直接输出对象看到对象地址是毫无意义的，更多时候是希望看到对象中的内容数据而不是假地址信息 + +所以toString()方法存在的意义就是为了被子类重写，以便返回对象的内容信息，而不是地址信息。 + +### equals方法 + +`public boolean equals(Object 0)`默认是比较当前对象与另一对象地址值是否相同，返回boolean类型 + +#### 意义： + +父类equals方法存在的意义就是为了子类重写，以便于子类自己定制比较规则 + +**IDEA中重写的equals方法：** + +```java +public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + Student student = (Student) o; + return age == student.age && Objects.equals(name, student.name); + } +``` + +### **Objects类中的equals方法** + +避免了空指针异常问题 + +```java +public static boolean equals(Object a, Object b) { + return (a == b) || (a != null && a.equals(b)); +} +``` + +双&&或者双||，都是执行左边若为false或者true则右侧不执行 + +![image-20250401155734366](https://gitee.com/icecat2233/picture/raw/master/20250401155745359.png) \ No newline at end of file