Class.forName加载自定义类(无参数构造方法)

通过Class.forName加载自定义类，初始化调用的是无参数构造方法：

1、先定义一个类，比如Student,代码如下：

package ready.nextyear;

public class Student {

private int age;
private String name = "Alfira";

public Student() {
super();
}

public Student(int age, String name) {
super();
this.age = age;
this.name = 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;
}
}


以上是一个自定义的Student类，后面会通过Class.forName()方法来加载；
2、测试类，代码如下：

package ready.nextyear;

public class TestClassForName {

public static void main(String[] args) throws ClassNotFoundException,
InstantiationException, IllegalAccessException {

Class stu = Class.forName("ready.nextyear.Student");
Student student = (Student) stu.newInstance();
// 首字母大写，参数是类名，要求是全限定名，返回的是Class对象
System.out.println("the student name: " + student.getName() + "\n"
+ "the age is : " + student.getAge());

}

}


注意，这里没有传入任何参数初始化Student类；
3、输出结果如下：

the student name: Alfira
the age is : 0
打印的都是类的成员变量的初始值：
private int age;
private String name = "Alfira";