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Java Reflection - Field.getDouble() 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 double getDouble(Object obj)
                 throws IllegalArgumentException,
                        IllegalAccessException

Gets the value of a static or instance field of type double or of another primitive type convertible to type double via a widening conversion.


Examples


package com.logicbig.example.field;

import java.lang.reflect.Field;

public class GetDoubleExample {
    private double aDouble = 2;
    private static final double PI = Math.PI;

    public static void main(String... args) throws NoSuchFieldException, IllegalAccessException {
        Field field = GetDoubleExample.class.getDeclaredField("aDouble");
        double d = field.getDouble(new GetDoubleExample());
        System.out.println(d);

        //static field
        Field field2 = GetDoubleExample.class.getDeclaredField("PI");
        double d2 = field2.getDouble(null);
        System.out.println(d2);
    }
}

Output

2.0
3.141592653589793




Widening type conversion: 

package com.logicbig.example.field;

import java.lang.reflect.Field;

public class GetDoubleExample2 {
    private int anInt = 3;

    public static void main(String... args) throws NoSuchFieldException, IllegalAccessException {
        Field field = GetDoubleExample2.class.getDeclaredField("anInt");
        double d = field.getDouble(new GetDoubleExample2());
        System.out.println(d);
    }
}

Output

3.0

See Also