Java Get Private Field

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Is it possible in Java to access private field str via reflection? For example to get value of this field.
Volodymyr Bezuglyy
Volodymyr Bezuglyy 14.4k●3131 gold badges●9696 silver badges●125125 bronze badges
The question would have been greatly improved if it included "I tried this..." with the code in question. – duffymo Oct 12 '09 at 17:01
The question is a dupe - it has been asked and answered a few times – oxbow_lakes Oct 12 '09 at 17:02
Yes, it absolutely is - assuming you've got the appropriate security permissions. Use Field.setAccessible(true) first if you're accessing it from a different class.
And no, you shouldn't normally do this... it's subverting the intentions of the original author of the class. For example, there may well be validation applied in any situation where the field can normally be set, or other fields may be changed at the same time. You're effectively violating the intended level of encapsulation.
Jon Skeet
Jon Skeet 1.3m●800800 gold badges●87608760 silver badges●89538953 bronze badges
There are very few instances where you should do this, as Jon noted. I have unfortunately had to do it more than I care to admit, and it makes for VERY ugly code. – aperkins Oct 12 '09 at 17:01
Nice correction. (See Guideline 6-4 of Secure Coding Guidelines Version 2.0 for the Java Programming Language: java.sun.com/security/seccodeguide.html ) – Tom Hawtin - tackline Oct 12 '09 at 18:03
@Downvoter: Care to explain why? – Jon Skeet Nov 1 '09 at 7:51
@JonSkeet why java allow this to access private members? why java created setAccessible() method? – Asif Mushtaq Apr 24 '16 at 10:42
@IslamEl-Rougy: Reflection is quite often a pragmatic solution for otherwise annoying situations. It's definitely worth avoiding where possible, and is often a bad solution. I don't know whether I'd go so far as to prohibit it entirely, but I'd always at least be nervous. – Jon Skeet Jan 8 '19 at 16:20
Then you use the field object to get the value on an instance of the class.
Note that get method is often confusing for people. You have the field, but you don't have an instance of the object. You have to pass that to the get method
Yishai
Yishai 85.5k●2626 gold badges●176176 silver badges●250250 bronze badges
@Gevorg it is a reference variable pointing to an instance of the class with the private field. – Yishai Feb 3 '19 at 23:06
You need to use the getDeclaredField method (instead of the getField method), with the name of your private field:
Additionally, you need to set this Field to be accessible, if you want to access a private field:
Once that's done, you can use the get method on the Field instance, to access the value of the str field.
pythonquick
pythonquick 10.5k●66 gold badges●3030 silver badges●2828 bronze badges
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The get() and set() method are used to get and set public field value in java.
Note: We have to turn off the java access check for field modifiers.
package com.w3spoint;
 
public class TestClass {
private int testField = 20;
}
package com.w3spoint;
 
import java.lang.reflect.Field;
 
public class ReflectionTest {
public static void main(String args[]){
try {
TestClass testClass = new TestClass();
Class c=Class.forName("com.w3spoint.TestClass");
Field field = c.getDeclaredField("testField");
field.setAccessible(true);
System.out.println(field.get(testClass));
field.setInt(testClass, 50);
System.out.println(field.get(testClass));
} catch (Exception e) {
e.printStackTrace();
}
}
}
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