父类中获取子类范型类型

import java.lang.reflect.ParameterizedType;

public abstract class Base<T> {
	private Class<T> persistentClass;

	@SuppressWarnings("unchecked")
	public Base() {
		// 获取持久化对象的类型
		this.persistentClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass())
				.getActualTypeArguments()[0];
	}

	public Class<T> getPersistentClass() {
		return persistentClass;
	}

	public void printClazz() {
		System.out.println(persistentClass.getName());
	}
}

 

import java.util.HashSet;
import java.util.Set;

public class BaseSub extends Base<BaseEntity> {
	public static void main(String[] args) {
		Base b = new BaseSub();
		b.printClazz();
		// 初始化只双花括号用法
		Set<String> VALID_CODES = new HashSet<String>() {
			{
				add("XZ13s");
				add("AB21/X");
				add("YYLEX");
				add("AR2D");
			}
		};
	}
}

class Example {
	public static void main(String[] args) {
		// label冒充URL用法
		http: // www.iteye.com
		System.out.println("Hello World!");
	}
}

 

public class BaseEntity {
}