In this example we shall show you how to get the fields of a class represented by an object. To get the fields of a class represented by an object one should perform the following steps:

• Get an array containingField objects reflecting all the accessible public fields of the class or interface represented by thisClass object, withgetFields() API method ofClass.
• Then get an array ofField objects reflecting all the fields declared by the class or interface represented by this Class object, withgetDeclaredFields() API method ofClass. This includes public, protected, default (package) access, and private fields, but excludes inherited fields,

as described in the code snippet below.

package com.javacodegeeks.snippets.core;import java.lang.reflect.Field;public class GetFieldsFromAnObject {public static void main(String[] args) {Class<?> clazz = java.lang.String.class;Field[] fields;// list with all the accessible public fields of the class or interfacefields = clazz.getFields();for (int i = 0; i < fields.length; i++) {System.out.println("Found public field: " + fields[i]);}System.out.println();// list with all the fields declared by this class or interfacefields = clazz.getDeclaredFields();for (int i = 0; i < fields.length; i++) {System.out.println("Found field: " + fields[i]);}}}

Output:

Found public field: public static final java.util.Comparator java.lang.String.CASE_INSENSITIVE_ORDERFound field: private final char[] java.lang.String.valueFound field: private final int java.lang.String.offsetFound field: private final int java.lang.String.countFound field: private int java.lang.String.hashFound field: private static final long java.lang.String.serialVersionUIDFound field: private static final java.io.ObjectStreamField[] java.lang.String.serialPersistentFieldsFound field: public static final java.util.Comparator java.lang.String.CASE_INSENSITIVE_ORDER

 
This was an example of how to get the fields of a class represented by an object in Java.

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