study annotations

study-annotations/src/com/example/lottery/application/LotteryApplication.java

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+package com.example.lottery.application;
+
+import com.example.lottery.model.LotteryViewModel;
+
+public class LotteryApplication {
+
+	public static void main(String[] args) {
+		LotteryViewModel model = new LotteryViewModel();
+		System.out.println(model.getNumbers());
+
+	}
+
+}

study-annotations/src/com/example/lottery/model/LotteryViewModel.java

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+package com.example.lottery.model;
+
+import java.util.List;
+
+public class LotteryViewModel {
+	// metadata
+	// @RandomNumber(min=1,max=60,size=6,sorted=true,unique=true)
+	@RandomNumber
+	private List<Integer> numbers;
+
+	public LotteryViewModel() {
+	}
+
+	public List<Integer> getNumbers() {
+		return numbers;
+	}
+
+}

study-annotations/src/com/example/lottery/model/RandomNumber.java

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+package com.example.lottery.model;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.FIELD,ElementType.PARAMETER}) 
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Inherited
+public @interface RandomNumber {
+    int min() default 1;
+
+	int max() default 60 ;
+
+	int size() default 6;
+
+	boolean unique() default true;
+
+	boolean sorted() default true;
+
+}