Get a variable value from the variable name : Field « Reflection « Java Tutorial

1. Java Tutorial
2. Reflection
3. Field

import java.lang.reflect.Field;

public class Main {
  public static void main(String[] args) throws Exception {
    Object clazz = new TestClass();
    String lookingForValue = "firstValue";

    Field field = clazz.getClass().getField(lookingForValue);
    Class clazzType = field.getType();
    if (clazzType.toString().equals("double"))
      System.out.println(field.getDouble(clazz));
    else if (clazzType.toString().equals("int"))
      System.out.println(field.getInt(clazz));
    
    //System.out.println(field.get(clazz));
  }
}

class TestClass {
  public double firstValue = 3.14;
}