// 通過類名來構(gòu)造一個(gè)類的實(shí)例
Class cls_str = Class.forName( "java.lang.String" );
// 上面這句很眼熟，因?yàn)槭褂眠^ JDBC 訪問數(shù)據(jù)庫的人都用過 J
Object str = cls_str.newInstance();
// 相當(dāng)于 String str = new String();

// 通過方法名來調(diào)用一個(gè)方法
String methodName = "length" ;
Method m = cls_str.getMethod(methodName, null );
System.out.println( "length is " + m.invoke(str, null ));
// 相當(dāng)于 System.out.println(str.length());

/*?
?* Created on 2004-6-29
?*/

package demo;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

/**
? * 內(nèi)省演示例子
? * @author liudong
? */

public class IntrospectorDemo {
??? String name;
??? public static void main(String[] args) throws Exception{
??????? IntrospectorDemo demo = new IntrospectorDemo();
??????? demo.setName( "Winter Lau" ); ???????

??????? // 如果不想把父類的屬性也列出來的話，
??????? // 那 getBeanInfo 的第二個(gè)參數(shù)填寫父類的信息
??????? BeanInfo bi = Introspector.getBeanInfo(demo.getClass(), Object. class );
??????? PropertyDescriptor[] props = bi.getPropertyDescriptors();
??????? for ( int i=0;i<props.length;i++){
??????????? System.out.println(props[i].getName()+ "=" +
??????????????????? props[i].getReadMethod().invoke(demo, null ));
??????? }

??? } ???

??? public String getName() {
??????? return name;
??? }

??? public void setName(String name) {
??????? this .name = name;
??? }
}