方法介绍
- 可将属性名为propertyName的属性值设置为value
class Tool {
/**des: 此方法可将属性名为propertyName的属性值设置为value
*
* @param obj : 相当于学生对象
* @param propertyName : 相当于学生对象的name或者age属性
* @param value :要修改的学生name或age值
* @throws Exception
*/
public void setProperty(Object obj, String propertyName, Object value) throws Exception {
// 获取字节码对象
Class clazz = obj.getClass();
// 暴力反射获取字段
Field f = clazz.getDeclaredField(propertyName);
// 取出权限
f.setAccessible(true);
// 将属性名为propertyName的属性值设置为value
f.set(obj, value);
}
}
方法使用:
class Student {
private String name;
private int age;
public Student() {
}
public Student(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "student{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}
public static void main(String[] args) {
Student s = new Student("古力娜扎", 23);
System.out.println(s);
Tool tool = new Tool();
tool.setProperty(s, "name", "迪丽热巴 ");
System.out.println(s);
}
结果:
student{name='古力娜扎', age=23}
student{name='迪丽热巴 ', age=23}