我想在不使用setter的情况下向Object变量插入值.怎么可能.
这是一个例子
Class X{
String variableName;
// getters and setters
}
现在我有一个函数,它包含变量名,要设置的值和Class X的Object.
我试图使用泛型方法将值设置为Object(objectOfClass),并在相应的变量(variableName)中传递值i(valuetoBeSet).
Object functionName(String variableName,Object valuetoBeSet,Object objectOfClass){
//I want to do the exact same thing as it does when setting the value using the below statement
//objectOfClass.setX(valuetoBeSet);
return objectOfClass;
}
解决方法
此代码未经过测试.你可以试试这个.
要导入的类
import java.beans.BeanInfo; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method;
方法
public Object functionName(String variableName,Object objectOfClass) throws IntrospectionException,NoSuchMethodException,SecurityException,illegalaccessexception,IllegalArgumentException,InvocationTargetException{
//I want to do the exact same thing as it does when setting the value using the below statement
//objectOfClass.setX(valuetoBeSet);
Class clazz = objectOfClass.getClass();
BeanInfo beanInfo = Introspector.getBeanInfo(clazz,Object.class); // get bean info
PropertyDescriptor[] props = beanInfo.getPropertyDescriptors(); // gets all info about all properties of the class.
for (PropertyDescriptor descriptor : props) {
String property = descriptor.getdisplayName();
if(property.equals(variableName)) {
String setter = descriptor.getWriteMethod().getName();
Class parameterType = descriptor.getPropertyType();
Method setterMethod = clazz.getDeclaredMethod(setter,parameterType); //Using Method Reflection
setterMethod.invoke(objectOfClass,valuetoBeSet);
}
}
return objectOfClass;
}