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Java Reflection - Field.set() Examples

Java Reflection Java Java API 

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Class:

java.lang.reflect.Field

java.lang.Objectjava.lang.Objectjava.lang.reflect.AccessibleObjectjava.lang.reflect.AccessibleObjectjava.lang.reflect.AnnotatedElementAnnotatedElementjava.lang.reflect.Fieldjava.lang.reflect.Fieldjava.lang.reflect.MemberMemberLogicBig

Method:

public void set(Object obj,
                Object value)
         throws IllegalArgumentException,
                IllegalAccessException

Sets this field value for the provided object.


Examples


package com.logicbig.example.field;

import java.lang.reflect.Field;

public class SetExample {
    private String myStr;

    public static void main(String... args) throws NoSuchFieldException, IllegalAccessException {
        Field f = SetExample.class.getDeclaredField("myStr");
        SetExample instance = new SetExample();
        f.set(instance, "test string");
        System.out.println(f.get(instance));
    }
}

Output

test string




package com.logicbig.example.field;

import java.lang.reflect.Field;

public class SetExample2 {
    private static String myStaticStr;

    public static void main(String... args) throws NoSuchFieldException, IllegalAccessException {
        Field f = SetExample2.class.getDeclaredField("myStaticStr");
        f.set(null, "a test static string");
        System.out.println(f.get(null));
    }
}

Output

a test static string

See Also