Java Field getDeclaringClass()方法及实例
java.lang.reflect .Field 的 getDeclaringClass() 方法是用来获取声明了该Field对象所代表的字段的Class对象。如果字段对象存在,而我们想获得类对象,那么我们可以用这个方法获得该类对象。
语法
public Class<T> getDeclaringClass()
Java
参数: 此方法不接受任何东西。
返回值: 该方法返回一个代表基础成员的声明类的对象。
下面的程序说明了getDeclaringClass()方法:
程序1 :
// Java program to demonstrate the above method
import java.lang.reflect.Field;
public class GFG {
public static void main(String[] args)
throws NoSuchFieldException,
SecurityException
{
// Get the value field object
Field field
= User.class
.getField("identificationChar");
// get the declaring class object
Class declaringClass
= field.getDeclaringClass();
// print result
System.out.println("Declaring Class"
+ " for Field Object: "
+ declaringClass);
}
}
// sample User class
class User {
// static char values
public static char identificationChar = 'E';
public static char selectionChar = 'A';
public static String name = "Aman";
// getter and setter methods
public static char getIdentificationChar()
{
return identificationChar;
}
public static void
setIdentificationChar(char identificationChar)
{
User.identificationChar = identificationChar;
}
public static char getSelectionChar()
{
return selectionChar;
}
public static void
setSelectionChar(char selectionChar)
{
User.selectionChar = selectionChar;
}
public static String getName()
{
return name;
}
public static void setName(String name)
{
User.name = name;
}
}
Java
输出:
Declaring Class for Field Object: class User
Java
程序2
// Java program to demonstrate the above method
import java.lang.reflect.Field;
import java.lang.reflect.Field;
public class GFG {
public static void main(String[] args)
throws NoSuchFieldException,
SecurityException
{
// Get the value field object
Field field
= Alphabets.class.getField("value");
// get the declaring class object
Class declaringClass
= field.getDeclaringClass();
// print result
System.out.println("Declaring Class: "
+ declaringClass);
}
// Alphabets class
static class Alphabets {
// char field
public static char value = 'Q';
// getter and setter methods
public static char getValue()
{
return value;
}
public static void setValue(char value)
{
Alphabets.value = value;
}
}
}
Java
输出:
Declaring Class: class GFG$Alphabets
Java
参考文献 : https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#getDeclaringClass-