Java 获取Class的三种方式-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_12004/article/details/82089927

本文介绍了在Java中获取Class对象的三种常见方法：通过对象的getClass()方法、使用Class类的静态方法forName()以及直接利用类的.class属性。这三种方式各有特点，适用于不同的场景。

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/**
 * 
 */
package freewill.classObject;

import freewill.objectequals.Employee;

/**
 * @author freewill
 * @desc 获取Class的三种方式
 */
public class Demo {

	/**
	 * @desc 方法1：通过getClass获取
	 * @return Class
	 */
	public Class<Employee> getClass1() {
		Employee e = new Employee();
		@SuppressWarnings("unchecked")
		Class<Employee> cl = (Class<Employee>) e.getClass();
		return cl;
	}

	/**
	 * @desc 方法2：通过静态方法Class.forName获取
	 * @return Class
	 * @throws ClassNotFoundException
	 */
	public Class<Employee> getClass2() throws ClassNotFoundException {
		String classname = "freewill.objectequals.Employee";
		@SuppressWarnings("unchecked")
		Class<Employee> cl = (Class<Employee>) Class.forName(classname);
		return cl;
	}

	/**
	 * @desc 方法3：通过类.class属性获取
	 * @return Class
	 */
	public Class<Employee> getClass3() {
		Class<Employee> cl = Employee.class;
		return cl;
	}

	public static void main(String[] args) throws ClassNotFoundException {
		Demo demo = new Demo();
		Class<Employee> class1 = demo.getClass1();
		System.out.println(class1.getName());

		Class<Employee> class2 = demo.getClass2();
		System.out.println(class2.getName());

		Class<Employee> class3 = demo.getClass3();
		System.out.println(class3.getName());
	}
}