按要求完成下面两个方法的方法体
- 写一个方法，此方法可将obj对象中名为propertyName的属性的值设置为value.
public void setProperty(Object obj, String propertyName, Object value){} - 写一个方法，此方法可以获取obj对象中名为propertyName的属性的值
public Object getProperty(Object obj, String propertyName){}
使用反射技术实现。 使用Field对象给成员变量赋值、取值
public class Student {
private int age;
private String name;
public Student() {
}
public Student(int age, String name) {
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;
}
@Override
public String toString() {
return "Student{" +
"age=" + age +
", name='" + name + '\'' +
'}';
}
}
public class Test {
public static void main(String[] args) throws Exception {
Student student = new Student(18, "王宝强");
setProperty(student, "age", 21);
System.out.println(student);
Object obj = getProperty(student, "name");
System.out.println(obj);
}
public static void setProperty(Object obj, String propertyName, Object value) throws Exception {
Class clazz = obj.getClass();
Field propertyNameField = clazz.getDeclaredField(propertyName);
propertyNameField.setAccessible(true);
propertyNameField.set(obj, value);
}
public static Object getProperty(Object obj, String propertyName) throws Exception {
Class clazz = obj.getClass();
Field propertyNameField = clazz.getDeclaredField(propertyName);
propertyNameField.setAccessible(true);
return propertyNameField.get(obj);
}
}