反射练习

1.反射

一种计算机处理方式。是程序可以访问、检测和修改它本身状态或行为的一种能力。

新建一个Person类：

public class Person {
private int age;
private String name;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Person(){}private Job job;
public Job getJob() {
return job;
}
public void setJob(Job job) {
this.job = job;
}
}

2.再建一个测试类：

public class TestUI {public static void main(String[] args) {Class classzz = Person.class;Field[] fields = classzz.getDeclaredFields();for(Field f:fields){Class c = f.getType();if(c.getPackage()!=null){if(c.getPackage().getName().equals("com.Test")){//筛选出Job类System.out.println(c.getPackage().getName());System.out.println("字段的类型:"+c.getName());System.out.println("该字段的名字:"+f.getName());}}}String userInfoSQL = BeanUtil.getSelect(new UserInfo());System.out.println(userInfoSQL);}
}

3.新建一个Job类：

public class Job {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}
}

4.BeanUtil类的内容

public class BeanUtil {public static String getSelect(Object obj){Class classzz = obj.getClass();String TableName = classzz.getSimpleName();StringBuffer sql = new StringBuffer();sql.append("Select * from "+TableName+" ");return sql.toString();}
}