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Java Reflection - Array.getDouble() Examples

Java Reflection Java Java API

Class:

java.lang.reflect.Array

Method:

public static double getDouble(Object array,
                               int index)
                        throws IllegalArgumentException,
                               ArrayIndexOutOfBoundsException

Returns the value of the indexed component in the specified array object, as a double .

Examples

package com.logicbig.example.array;

import java.lang.reflect.Array;

public class GetDoubleExample {

    public static void main(String... args) {
        double[] arr = {1, 4, 9};
        double d = Array.getDouble(arr, 1);
        System.out.println(d);
    }
}

Output

4.0

package com.logicbig.example.array;

import java.lang.reflect.Array;

public class GetDoubleExample2 {

    public static void main(String... args) {
        Double[] arr = {1d, 4d, 9d};
        double d = Array.getDouble(arr, 1);
        System.out.println(d);
    }
}

Output

Caused by: java.lang.IllegalArgumentException: Argument is not an array of primitive type
	at java.base/java.lang.reflect.Array.getDouble(Native Method)
	at com.logicbig.example.array.GetDoubleExample2.main(GetDoubleExample2.java:14)
	... 6 more

See Also