Java反射常用示例
package xmq.study.reflection; import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier; /***
* Java 反射
* @author 943567518@qq.com
*
*/
public class Test1 { private String prop1;
private Integer prop2;
private Double prop3; public String getProp1() {
return prop1;
}
public void setProp1(String prop1) {
this.prop1 = prop1;
}
public Integer getProp2() {
return prop2;
}
public void setProp2(Integer prop2) {
this.prop2 = prop2;
}
public Double getProp3() {
return prop3;
}
public void setProp3(Double prop3) {
this.prop3 = prop3;
}
public static void main(String[] args) throws ClassNotFoundException, IllegalArgumentException, IllegalAccessException { Test1 test1=new Test1();
test1.setProp1("Hello");
test1.setProp2(100); Class clazz=Test1.class;//获取Class对象方式1
Class clazz2=Class.forName("xmq.study.reflection.Test1");//获取Class对象方式2 String clazzName=clazz.getName();//获取类名,含包名
String clazzSimpleName=clazz.getSimpleName();//获取类名,不含包名
System.out.println("getName:"+clazzName+"\tgetSimpleName:"+clazzSimpleName); int mod=clazz.getModifiers();//获取类修饰符
System.out.println("Modifier.isPublic:"+Modifier.isPublic(mod));//判断类修饰符
System.out.println("Modifier.isProtected:"+Modifier.isProtected(mod));//判断类修饰符 Package p=clazz.getPackage();//获取包
System.out.println("getPackage:"+p); Class superClass=clazz.getSuperclass();//获取父类
System.out.println("getSuperclass:"+superClass); Class[] interfaces=clazz.getInterfaces();//获取实现接口
System.out.println("getInterfaces:"+interfaces.length); Constructor[] cons=clazz.getConstructors();//构造方法
System.out.println("getConstructors:"+cons.length);
Method[] methods=clazz.getMethods();//获取所有方法
System.out.println("getMethods:"+methods.length);
for(Method method:methods){
System.out.println("method.getName:"+method);
}
Method[] methods=clazz.getMethods();//获取私有方法
System.out.println("getMethods:"+methods.length);
for(Method method:methods){
System.out.println("method.getName:"+method.getName());
}
Method method=clazz.getMethod("getProp1", null);//获取指定方法
System.out.println("getMethod(,):"+method);
Object methodVlaue=method.invoke(test1, null);//调用方法
System.out.println("method.invoke(,):"+methodVlaue);
Method method3=clazz.getMethod("setProp3",Double.class);//获取指定方法
System.out.println("getMethod(,):"+method3);
Object methodVlaue3=method3.invoke(test1, 2.0);//调用setter方法,该方法没有返回值,所以methodVlaue3为null;此处注意参数2.0 ,不能用null
System.out.println("method.invoke(,):"+methodVlaue3);
Field[] fields=clazz.getDeclaredFields();//获取变量
System.out.println("getDeclaredFields:"+fields.length);
for(Field field:fields){
field.setAccessible(true);
field.set(test1,null);//设置字段的值
System.out.println("field.getAnnotations:"+field.getAnnotations().length+"\tfield.getName:"+field.getName()+"\tfield.get:"+field.get(test1));//获取实例属性名和值 } Annotation[] annos=clazz.getAnnotations();//获取类注解
System.out.println("getAnnotations:"+annos.length); }
}
控制台输出:
getName:xmq.study.reflection.Test1 getSimpleName:Test1
Modifier.isPublic:true
Modifier.isProtected:false
getPackage:package xmq.study.reflection
getSuperclass:class java.lang.Object
getInterfaces:0
getConstructors:1
getMethods:16
method.getName:public static void xmq.study.reflection.Test1.main(java.lang.String[]) throws java.lang.ClassNotFoundException,java.lang.IllegalArgumentException,java.lang.IllegalAccessException,java.lang.NoSuchMethodException,java.lang.SecurityException,java.lang.reflect.InvocationTargetException
method.getName:public java.lang.String xmq.study.reflection.Test1.getProp1()
method.getName:public void xmq.study.reflection.Test1.setProp1(java.lang.String)
method.getName:public java.lang.Integer xmq.study.reflection.Test1.getProp2()
method.getName:public void xmq.study.reflection.Test1.setProp2(java.lang.Integer)
method.getName:public java.lang.Double xmq.study.reflection.Test1.getProp3()
method.getName:public void xmq.study.reflection.Test1.setProp3(java.lang.Double)
method.getName:public final void java.lang.Object.wait(long,int) throws java.lang.InterruptedException
method.getName:public final native void java.lang.Object.wait(long) throws java.lang.InterruptedException
method.getName:public final void java.lang.Object.wait() throws java.lang.InterruptedException
method.getName:public boolean java.lang.Object.equals(java.lang.Object)
method.getName:public java.lang.String java.lang.Object.toString()
method.getName:public native int java.lang.Object.hashCode()
method.getName:public final native java.lang.Class java.lang.Object.getClass()
method.getName:public final native void java.lang.Object.notify()
method.getName:public final native void java.lang.Object.notifyAll()
getDeclaredMethods:7
method.getName:public static void xmq.study.reflection.Test1.main(java.lang.String[]) throws java.lang.ClassNotFoundException,java.lang.IllegalArgumentException,java.lang.IllegalAccessException,java.lang.NoSuchMethodException,java.lang.SecurityException,java.lang.reflect.InvocationTargetException
method.getName:public java.lang.String xmq.study.reflection.Test1.getProp1()
method.getName:public void xmq.study.reflection.Test1.setProp1(java.lang.String)
method.getName:public java.lang.Integer xmq.study.reflection.Test1.getProp2()
method.getName:public void xmq.study.reflection.Test1.setProp2(java.lang.Integer)
method.getName:public java.lang.Double xmq.study.reflection.Test1.getProp3()
method.getName:public void xmq.study.reflection.Test1.setProp3(java.lang.Double)
getMethod(,):public java.lang.String xmq.study.reflection.Test1.getProp1()
method.invoke(,):Hello
getMethod(,):public void xmq.study.reflection.Test1.setProp3(java.lang.Double)
method.invoke(,):null
getDeclaredFields:3
field.getAnnotations:0 field.getName:prop1 field.get:null
field.getAnnotations:0 field.getName:prop2 field.get:null
field.getAnnotations:0 field.getName:prop3 field.get:null
getAnnotations:0
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