class="markdown_views prism-atom-one-light">

JAVAclass="tags" href="/tags/FanShe.html" title=反射>反射小实例

实体类:

class="prism language-class="tags" href="/tags/JAVA.html" title=java>java">class="token keyword">package dtoclass="token punctuation">;

class="token keyword">import class="tags" href="/tags/JAVA.html" title=java>javaclass="token punctuation">.utilclass="token punctuation">.Dateclass="token punctuation">;
class="token keyword">import class="tags" href="/tags/JAVA.html" title=java>javaclass="token punctuation">.textclass="token punctuation">.SimpleDateFormatclass="token punctuation">;

class="token keyword">public class="token keyword">class class="token class-name">Student class="token punctuation">{
	class="token keyword">private String name class="token operator">= nullclass="token punctuation">;
	class="token keyword">private class="token keyword">int ageclass="token punctuation">;
	class="token keyword">private String addr class="token operator">= nullclass="token punctuation">;
	class="token keyword">private Double slaryclass="token punctuation">;
	class="token keyword">private Date bronthclass="token punctuation">;
	SimpleDateFormat sdfclass="token operator">=class="token keyword">new class="token class-name">SimpleDateFormatclass="token punctuation">(class="token string">"yyyy-MM-dd HH:mm:ss"class="token punctuation">)class="token punctuation">;
	class="token keyword">public String class="token function">toStringclass="token punctuation">(class="token punctuation">)class="token punctuation">{
		class="token keyword">return class="token string">"姓名: "class="token operator">+nameclass="token operator">+class="token string">"\n年龄: "class="token operator">+ageclass="token operator">+class="token string">"\n地址: "class="token operator">+addrclass="token operator">+class="token string">"\n薪水: "class="token operator">+slaryclass="token operator">+class="token string">"\n出生日期: "class="token operator">+ sdfclass="token punctuation">.class="token function">formatclass="token punctuation">(bronthclass="token punctuation">)class="token punctuation">;
	class="token punctuation">}
	
	class="token keyword">public String class="token function">getNameclass="token punctuation">(class="token punctuation">) class="token punctuation">{
		class="token keyword">return nameclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public class="token keyword">void class="token function">setNameclass="token punctuation">(String nameclass="token punctuation">) class="token punctuation">{
		class="token keyword">thisclass="token punctuation">.name class="token operator">= nameclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public class="token keyword">int class="token function">getAgeclass="token punctuation">(class="token punctuation">) class="token punctuation">{
		class="token keyword">return ageclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public class="token keyword">void class="token function">setAgeclass="token punctuation">(class="token keyword">int ageclass="token punctuation">) class="token punctuation">{
		class="token keyword">thisclass="token punctuation">.age class="token operator">= ageclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public String class="token function">getAddrclass="token punctuation">(class="token punctuation">) class="token punctuation">{
		class="token keyword">return addrclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public class="token keyword">void class="token function">setAddrclass="token punctuation">(String addrclass="token punctuation">) class="token punctuation">{
		class="token keyword">thisclass="token punctuation">.addr class="token operator">= addrclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public Double class="token function">getSlaryclass="token punctuation">(class="token punctuation">) class="token punctuation">{
		class="token keyword">return slaryclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public class="token keyword">void class="token function">setSlaryclass="token punctuation">(Double slaryclass="token punctuation">) class="token punctuation">{
		class="token keyword">thisclass="token punctuation">.slary class="token operator">= slaryclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public Date class="token function">getBronthclass="token punctuation">(class="token punctuation">) class="token punctuation">{
		class="token keyword">return bronthclass="token punctuation">;
	class="token punctuation">}

	class="token keyword">public class="token keyword">void class="token function">setBronthclass="token punctuation">(Date bronthclass="token punctuation">) class="token punctuation">{
		class="token keyword">thisclass="token punctuation">.bronth class="token operator">= bronthclass="token punctuation">;
	class="token punctuation">}

class="token punctuation">}

测试类:

class="prism language-class="tags" href="/tags/JAVA.html" title=java>java">class="token keyword">import class="tags" href="/tags/JAVA.html" title=java>javaclass="token punctuation">.utilclass="token punctuation">.Dateclass="token punctuation">;
class="token keyword">import class="tags" href="/tags/JAVA.html" title=java>javaclass="token punctuation">.textclass="token punctuation">.SimpleDateFormatclass="token punctuation">;
class="token keyword">import class="tags" href="/tags/JAVA.html" title=java>javaclass="token punctuation">.langclass="token punctuation">.reflectclass="token punctuation">.Constructorclass="token punctuation">;
class="token keyword">public class="token keyword">class class="token class-name">test class="token punctuation">{
	class="token keyword">public class="token keyword">static class="token keyword">void class="token function">mainclass="token punctuation">(Stringclass="token punctuation">[class="token punctuation">] argsclass="token punctuation">) class="token keyword">throws Exception class="token punctuation">{
		class="token comment">//获取类的 Class 对象实例
		Classclass="token operator"><class="token operator">?class="token operator">> clz class="token operator">= Classclass="token punctuation">.class="token function">forNameclass="token punctuation">(class="token string">"dto.Student"class="token punctuation">)class="token punctuation">;
		class="token comment">//根据 Class 对象实例获取 Constructor 对象
		Constructorclass="token operator"><class="token operator">?class="token operator">> constructor class="token operator">= clzclass="token punctuation">.class="token function">getConstructorclass="token punctuation">(class="token punctuation">)class="token punctuation">;
		class="token comment">//使用 Constructor 对象的 newInstance 方法获取class="tags" href="/tags/FanShe.html" title=反射>反射类对象
		Object object class="token operator">= constructorclass="token punctuation">.class="token function">newInstanceclass="token punctuation">(class="token punctuation">)class="token punctuation">;
		class="token comment">//获取方法的 Method对象 并且 利用invoke方法调用方法
		clzclass="token punctuation">.class="token function">getMethodclass="token punctuation">(class="token string">"setName"class="token punctuation">, Stringclass="token punctuation">.class="token keyword">classclass="token punctuation">)class="token punctuation">.class="token function">invokeclass="token punctuation">(objectclass="token punctuation">, class="token string">"果酱"class="token punctuation">)class="token punctuation">;
		clzclass="token punctuation">.class="token function">getMethodclass="token punctuation">(class="token string">"setAge"class="token punctuation">, class="token keyword">intclass="token punctuation">.class="token keyword">classclass="token punctuation">)class="token punctuation">.class="token function">invokeclass="token punctuation">(objectclass="token punctuation">, class="token number">23class="token punctuation">)class="token punctuation">;
		clzclass="token punctuation">.class="token function">getMethodclass="token punctuation">(class="token string">"setAddr"class="token punctuation">, Stringclass="token punctuation">.class="token keyword">classclass="token punctuation">)class="token punctuation">.class="token function">invokeclass="token punctuation">(objectclass="token punctuation">, class="token string">"深圳"class="token punctuation">)class="token punctuation">;
		clzclass="token punctuation">.class="token function">getMethodclass="token punctuation">(class="token string">"setSlary"class="token punctuation">, Doubleclass="token punctuation">.class="token keyword">classclass="token punctuation">)class="token punctuation">.class="token function">invokeclass="token punctuation">(objectclass="token punctuation">, class="token number">1000.01class="token punctuation">)class="token punctuation">;
		clzclass="token punctuation">.class="token function">getMethodclass="token punctuation">(class="token string">"setBronth"class="token punctuation">, Dateclass="token punctuation">.class="token keyword">classclass="token punctuation">)class="token punctuation">.class="token function">invokeclass="token punctuation">(objectclass="token punctuation">, class="token keyword">new class="token class-name">SimpleDateFormatclass="token punctuation">(class="token string">"yyyy/MM/dd HH:mm:ss"class="token punctuation">)class="token punctuation">.class="token function">parseclass="token punctuation">(class="token string">"2020/07/12 10:11:12"class="token punctuation">)class="token punctuation">)class="token punctuation">;
		Systemclass="token punctuation">.outclass="token punctuation">.class="token function">printlnclass="token punctuation">(objectclass="token punctuation">.class="token function">toStringclass="token punctuation">(class="token punctuation">)class="token punctuation">)class="token punctuation">;
	class="token punctuation">}
class="token punctuation">}

更多详细内容参考文章:
大白话说Javaclass="tags" href="/tags/FanShe.html" title=反射>反射：入门、使用、原理