feat: add java enum demo

niumoo · niumoo · commit 4ab63d267bc7 · 2023-05-03T17:35:36.000+08:00
diff --git a/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/Calc.java b/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/Calc.java
@@ -0,0 +1,30 @@
+package com.wdbyte.enum2;
+
+/**
+ * 计算枚举类
+ */
+public enum Calc {
+    // 加法
+    PLUS {
+        public int apply(int x, int y) {
+            return x + y;
+        }
+    },
+    // 减法
+    MINUS {
+        public int apply(int x, int y) {
+            return x - y;
+        }
+    },
+    // 乘法
+    MULTIPLY {
+        public int apply(int x, int y) {
+            return x * y;
+        }
+    };
+
+    public int apply(int x, int y){
+        // todo
+        return x + y;
+    }
+}
diff --git a/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/CalcTest.java b/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/CalcTest.java
@@ -0,0 +1,19 @@
+package com.wdbyte.enum2;
+
+/**
+ * @author niulang
+ * @date 2023/05/01
+ */
+public class CalcTest {
+    public static void main(String[] args) {
+        // 加法
+        int res = Calc.PLUS.apply(2, 3);
+        System.out.println(res);
+        // 减法
+        res = Calc.MINUS.apply(2, 3);
+        System.out.println(res);
+        // 乘法
+        res = Calc.MULTIPLY.apply(2, 3);
+        System.out.println(res);
+    }
+}
diff --git a/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/Rectangle.java b/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/Rectangle.java
@@ -0,0 +1,28 @@
+package com.wdbyte.enum2;
+
+/**
+ * 矩形枚举类
+ */
+public enum Rectangle implements Shape {
+    SMALL(3, 4),
+    MEDIUM(4, 5),
+    LARGE(5, 6);
+
+    private int length;
+    private int width;
+
+    Rectangle(int length, int width) {
+        this.length = length;
+        this.width = width;
+    }
+
+    public double getArea() {
+        return length * width;
+    }
+
+    public static void main(String[] args) {
+        Shape shape = Rectangle.LARGE;
+        double shapeArea = shape.getArea();
+        System.out.println(shapeArea);
+    }
+}
diff --git a/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/WeekdayTest.java b/core-java-modules/core-java-base/src/main/java/com/wdbyte/enum2/WeekdayTest.java
@@ -0,0 +1,31 @@
+package com.wdbyte.enum2;
+
+/**
+ * @author niulang
+ * @date 2023/05/01
+ */
+public class WeekdayTest {
+    public static void main(String[] args) {
+        Weekday day = Weekday.MONDAY;
+        if (day == Weekday.MONDAY) {
+            System.out.println("Today is Monday.");
+        }
+
+
+        Weekday[] weekdays = Weekday.values();
+        for (Weekday weekday : weekdays) {
+            System.out.println(weekday);
+        }
+
+        for (Weekday weekday : weekdays) {
+            System.out.println(weekday.ordinal());
+        }
+        Weekday monday = Weekday.MONDAY;
+        switch (monday){
+            case MONDAY :{System.out.println("周一");break;}
+            case SUNDAY :{System.out.println("周末");break;}
+        }
+        System.out.println(Weekday.valueOf("MONDAY"));
+        System.out.println(Weekday.valueOf("MONDAY1"));
+    }
+}
