Java Reflection - Class.getFields() Examples

Code Snippets Java Reflection Java 


Class:

java.lang.Class

java.lang.Objectjava.lang.Objectjava.lang.Classjava.lang.Classjava.io.SerializableSerializablejava.lang.reflect.GenericDeclarationGenericDeclarationjava.lang.reflect.TypeTypejava.lang.reflect.AnnotatedElementAnnotatedElementLogicBig

Method:

public Field[] getFields()
                  throws SecurityException

Returns an array containing Field objects reflecting all the accessible public fields of the class or interface represented by this Class object.

Returns:
the array of Field objects representing the public fields


Examples


The field anotherNumber defined in a super interface and in a super class with different type, but both are returned:

package com.logicbig.example.clazz;

import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;

public class GetFieldsExample {

public static void main(String... args) {
Class<MyClass> c = MyClass.class;
Field[] fields = c.getFields();
Arrays.asList(fields).forEach(System.out::println);
}

private static class MyClass extends MySuperClass implements MyInterface {}

private static class MySuperClass extends MySuperSuperClass {
public String aString;
private char cChar;
public BigInteger anInteger;
public BigInteger anotherNumber;
}

private static class MySuperSuperClass {
public double aDouble;
BigInteger anotherNumber;
}

private static interface MyInterface {
BigDecimal aNumber = BigDecimal.TEN;
BigInteger anInteger = BigInteger.ONE;
BigDecimal anotherNumber = BigDecimal.ZERO;
}

}

Output

public static final java.math.BigDecimal com.logicbig.example.clazz.GetFieldsExample$MyInterface.aNumber
public static final java.math.BigInteger com.logicbig.example.clazz.GetFieldsExample$MyInterface.anInteger
public static final java.math.BigDecimal com.logicbig.example.clazz.GetFieldsExample$MyInterface.anotherNumber
public java.lang.String com.logicbig.example.clazz.GetFieldsExample$MySuperClass.aString
public java.math.BigInteger com.logicbig.example.clazz.GetFieldsExample$MySuperClass.anInteger
public java.math.BigInteger com.logicbig.example.clazz.GetFieldsExample$MySuperClass.anotherNumber
public double com.logicbig.example.clazz.GetFieldsExample$MySuperSuperClass.aDouble




See Also