add more

Author: laileon

src/com/blankj/custom/anotition/Col.java

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+package com.blankj.custom.anotition;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.FIELD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Col {
+	String name();
+}

src/com/blankj/custom/anotition/Main.java

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+package com.blankj.custom.anotition;
+
+import java.lang.reflect.Field;
+
+
+public class Main {
+	public static void main(String[] args) throws ClassNotFoundException {
+		String key = "MAJIAXUEYUAN";
+
+		StringBuffer sb = new StringBuffer();
+		sb.append("select ");
+		// 反射拿到字节码文件
+		Class<?> forName = Class.forName("com.blankj.custom.anotition.User");
+
+		// 拿到成员属性
+		Field[] declaredFields = forName.getDeclaredFields();
+
+		// 遍历属性
+		for (int i = 0; i < declaredFields.length; i++) {
+			// 拿到注解获取name值
+			Col col = declaredFields[i].getDeclaredAnnotation(Col.class);
+			String name = col.name();
+			sb.append(name);
+			if (i == declaredFields.length - 1) {
+				sb.append(" from ");
+			} else {
+				sb.append(" , ");
+			}
+		}
+		Table table = forName.getAnnotation(Table.class);
+		String name = table.name();
+		sb.append(name + " ");
+		sb.append(" where user_name = '" + key + "'");
+		System.out.println(sb.toString());
+		// select user_name,user_age from tb_user;
+	}
+}

src/com/blankj/custom/anotition/Table.java

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+package com.blankj.custom.anotition;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Table {
+	// @table(name="")
+	String name();
+}

src/com/blankj/custom/anotition/User.java

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+package com.blankj.custom.anotition;
+
+@Table(name = "tb_user")
+public class User {
+
+	@Col(name = "user_name")
+	private String userName;
+	@Col(name = "user_sex")
+	private String userSex;
+
+	public String getUserName() {
+		return userName;
+	}
+
+	public void setUserName(String userName) {
+		this.userName = userName;
+	}
+
+	public String getUserSex() {
+		return userSex;
+	}
+
+	public void setUserSex(String userSex) {
+		this.userSex = userSex;
+	}
+
+}

src/com/blankj/custom/factory/Benz.java

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+package com.blankj.custom.factory;
+
+public class Benz implements Car {
+
+	@Override
+	public void create() {
+		System.out.println("码家学院的Benz生产成功。");
+	}
+
+}

src/com/blankj/custom/factory/BenzFactory.java

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+package com.blankj.custom.factory;
+
+public interface BenzFactory {
+	static Car createCar() {
+		return new Benz();
+	}
+}

src/com/blankj/custom/factory/Bmw.java

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+package com.blankj.custom.factory;
+
+public class Bmw implements Car{
+
+	@Override
+	public void create() {
+		System.out.println("码家学院的BMW生产成功。");
+	}
+
+}

src/com/blankj/custom/factory/BmwFactory.java

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+package com.blankj.custom.factory;
+
+public interface BmwFactory {
+	static Car createCar() {
+		return new Bmw();
+	}
+}

src/com/blankj/custom/factory/Car.java

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+package com.blankj.custom.factory;
+
+public interface Car {
+	void create();
+}

src/com/blankj/custom/factory/Main.java

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+package com.blankj.custom.factory;
+
+public class Main {
+	public static void main(String[] args) {
+		Car bmw = BmwFactory.createCar();
+		Car benz = BenzFactory.createCar();
+
+		bmw.create();
+		benz.create();
+	}
+
+}

src/com/blankj/custom/single/Single1.java

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+package com.blankj.custom.single;
+
+// 懒汉式（线程安全问题）
+public class Single1 {
+	private static Single1 instance;
+
+	private Single1() {
+		System.out.println("构造函数运行-----");
+	}
+
+	public static Single1 getInstance() {
+		if (instance == null) {
+			instance = new Single1();
+		}
+		return instance;
+	}
+
+	public static void main(String[] args) {
+		Single1 instance = Single1.getInstance();
+		Single1 instance2 = Single1.getInstance();
+		System.out.println(instance == instance2);
+	}
+}

src/com/blankj/custom/single/Single2.java

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+package com.blankj.custom.single;
+
+// 懒汉式（）
+public class Single2 {
+	private static Single2 instance;
+
+	private Single2() {
+		System.out.println("Single2构造函数运行-----");
+	}
+
+	public static synchronized Single2 getInstance() {
+		if (instance == null) {
+			instance = new Single2();
+		}
+		return instance;
+	}
+
+	public static void main(String[] args) {
+		Single2 instance = Single2.getInstance();
+		Single2 instance2 = Single2.getInstance();
+		System.out.println("222:" + (instance == instance2));
+	}
+}

src/com/blankj/custom/single/Single3.java

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+package com.blankj.custom.single;
+
+/**
+ * 码家学院
+ * 
+ * @author Liao 单例模式，饿汉式
+ */
+public class Single3 {
+
+	private static Single3 instance = new Single3();
+
+	private Single3() {
+		System.out.println("构造函数--");
+	}
+
+	public static Single3 getInstance() {
+		return instance;
+	}
+
+	public static void main(String[] args) {
+		Single3 instance1 = Single3.getInstance();
+		Single3 instance2 = Single3.getInstance();
+		System.out.println("333:" + (instance1 == instance2));
+	}
+}