java 反射getClass .class 的使用方法示例

本文实例讲述了java 反射getClass .class 的使用方法。分享给大家供大家参考，具体如下：

java反射机制

怎么从一个实例上的获得类反射

obj.getClass();
//例子
String str1 = "123";
Class strClass1 = str1.getClass();
String str2 = new String("456");
Class strClass2 = str2.getClass();

怎么从一个类上获得类的反射

ClassName.class
//例子
Class a = String.class
Class b = Integer.class
Class c = Double.class

package Main;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import Demo.Demo1;
public class Index 
{
  public static void main(String[] agrs) throws Exception
  {
    Demo1 obj = new Demo1();
    String str = (String)runTargetMethod(obj,"test1",new Class[]{String.class,String.class},new Object[]{"2","3"});
    System.out.println(str);
    System.out.println();
    System.out.println();
    System.out.println();
    dumpTargetMethod(obj);
  }
  
  public static Object runTargetMethod(Object obj,String methodName,Class[] classes,Object[] valObj) throws Exception
  {
    Class classObj = obj.getClass();
    Method method = classObj.getMethod(methodName,classes);
    return method.invoke(obj, valObj);
  }
  
  public static void dumpTargetMethod(Object obj) throws IllegalArgumentException, IllegalAccessException
  {
    Class classObj = obj.getClass();
    System.out.println("-------------------method dump-------------------------");
    Method[] methods = classObj.getDeclaredMethods();
    for(Method method : methods)
    {
      Class[] parameters = method.getParameterTypes();
      StringBuffer strBuffer = new StringBuffer();
      for(int i=0;i


package Demo;

public class Demo1 
{
  public String demo1 = "demo1_val";
  protected String demo2 = "demo2_val";
  private String demo3 = "demo3_val";
  public static String demo4 = "demo4_val";
  public String getName()
  {
    return "my name is 勇哥";
  }
  public int getAge()
  {
    return 22;
  }
  public String test1(String str1,String str2)
  {
    StringBuffer buffer = new StringBuffer(str1);
    buffer.append(str2);
    return buffer.toString();
  }
  public String test1()
  {
    return "123";
  }
}



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希望本文所述对大家java程序设计有所帮助。