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java.lang.ArrayStoreException storing Integer in Integer array
The Next CEO of Stack OverflowCreate ArrayList from arrayHow do I check if an array includes an object in JavaScript?How to append something to an array?How do I generate random integers within a specific range in Java?How do I determine whether an array contains a particular value in Java?Loop through an array in JavaScriptHow to check if an object is an array?How do I remove a particular element from an array in JavaScript?For-each over an array in JavaScript?Why is it faster to process a sorted array than an unsorted array?
Why am I getting this exception?
java.lang.ArrayStoreException: java.lang.Integer
at MyLinkedList.toArray(MyLinkedList.java:94)
at MyLinkedListTest.toArray_ReturnGenericArray(MyLinkedListTest.java:80)
I am creating an Integer array and passing in Integer values. Why then, when I create a new instance of the same type of array, am I unable to assign integer values to it?
@Override
public <T1> T1[] toArray(T1[] a)
if (a.length < size)
a = (T1[]) java.lang.reflect.Array.newInstance(a.getClass(), size);
Node<T> current = head;
int i = 0;
Object[] result = a;
while (current != null)
result[i] = current.value;
i++;
current = current.next;
// if array has room to spare set element immediately following end of list to null
if (a.length > i)
a[i] = null;
return a;
@Test
void toArray_ReturnGenericArray()
Integer[] array2 = linkedList.toArray(new Integer[4]);
assertEquals(1, array2[0]);
assertEquals(2, array2[1]);
assertEquals(3, array2[2]);
assertEquals(4, array2[3]);
assertEquals(5, array2[4]);
assertEquals(5, array2.length);
java arrays
asked Mar 7 at 16:50
Co CodesCo Codes
31
add a comment |
Why am I getting this exception?
java.lang.ArrayStoreException: java.lang.Integer
at MyLinkedList.toArray(MyLinkedList.java:94)
at MyLinkedListTest.toArray_ReturnGenericArray(MyLinkedListTest.java:80)
I am creating an Integer array and passing in Integer values. Why then, when I create a new instance of the same type of array, am I unable to assign integer values to it?
@Override
public <T1> T1[] toArray(T1[] a)
if (a.length < size)
a = (T1[]) java.lang.reflect.Array.newInstance(a.getClass(), size);
Node<T> current = head;
int i = 0;
Object[] result = a;
while (current != null)
result[i] = current.value;
i++;
current = current.next;
// if array has room to spare set element immediately following end of list to null
if (a.length > i)
a[i] = null;
return a;
@Test
void toArray_ReturnGenericArray()
Integer[] array2 = linkedList.toArray(new Integer[4]);
assertEquals(1, array2[0]);
assertEquals(2, array2[1]);
assertEquals(3, array2[2]);
assertEquals(4, array2[3]);
assertEquals(5, array2[4]);
assertEquals(5, array2.length);
java arrays
asked Mar 7 at 16:50
Co CodesCo Codes
31
Usejava.util.Arrays#copyOf(U[], int, java.lang.Class<? extends T[]>)
– luk2302
Mar 7 at 16:57
add a comment |
Why am I getting this exception?
java.lang.ArrayStoreException: java.lang.Integer
at MyLinkedList.toArray(MyLinkedList.java:94)
at MyLinkedListTest.toArray_ReturnGenericArray(MyLinkedListTest.java:80)
I am creating an Integer array and passing in Integer values. Why then, when I create a new instance of the same type of array, am I unable to assign integer values to it?
@Override
public <T1> T1[] toArray(T1[] a)
if (a.length < size)
a = (T1[]) java.lang.reflect.Array.newInstance(a.getClass(), size);
Node<T> current = head;
int i = 0;
Object[] result = a;
while (current != null)
result[i] = current.value;
i++;
current = current.next;
// if array has room to spare set element immediately following end of list to null
if (a.length > i)
a[i] = null;
return a;
@Test
void toArray_ReturnGenericArray()
Integer[] array2 = linkedList.toArray(new Integer[4]);
assertEquals(1, array2[0]);
assertEquals(2, array2[1]);
assertEquals(3, array2[2]);
assertEquals(4, array2[3]);
assertEquals(5, array2[4]);
assertEquals(5, array2.length);
java arrays
asked Mar 7 at 16:50
Co CodesCo Codes
31
Why am I getting this exception?
java.lang.ArrayStoreException: java.lang.Integer
at MyLinkedList.toArray(MyLinkedList.java:94)
at MyLinkedListTest.toArray_ReturnGenericArray(MyLinkedListTest.java:80)
I am creating an Integer array and passing in Integer values. Why then, when I create a new instance of the same type of array, am I unable to assign integer values to it?
@Override
public <T1> T1[] toArray(T1[] a)
if (a.length < size)
a = (T1[]) java.lang.reflect.Array.newInstance(a.getClass(), size);
Node<T> current = head;
int i = 0;
Object[] result = a;
while (current != null)
result[i] = current.value;
i++;
current = current.next;
// if array has room to spare set element immediately following end of list to null
if (a.length > i)
a[i] = null;
return a;
@Test
void toArray_ReturnGenericArray()
Integer[] array2 = linkedList.toArray(new Integer[4]);
assertEquals(1, array2[0]);
assertEquals(2, array2[1]);
assertEquals(3, array2[2]);
assertEquals(4, array2[3]);
assertEquals(5, array2[4]);
assertEquals(5, array2.length);
java arrays
java arrays
asked Mar 7 at 16:50
Co CodesCo Codes
31
asked Mar 7 at 16:50
Co CodesCo Codes
31
asked Mar 7 at 16:50
Co CodesCo Codes
31
asked Mar 7 at 16:50
Co CodesCo Codes
31
asked Mar 7 at 16:50
Co CodesCo Codes
31
31
Usejava.util.Arrays#copyOf(U[], int, java.lang.Class<? extends T[]>)
– luk2302
Mar 7 at 16:57
add a comment |
Usejava.util.Arrays#copyOf(U[], int, java.lang.Class<? extends T[]>)
– luk2302
Mar 7 at 16:57
Use
java.util.Arrays#copyOf(U[], int, java.lang.Class<? extends T[]>)– luk2302
Mar 7 at 16:57
Use
java.util.Arrays#copyOf(U[], int, java.lang.Class<? extends T[]>)– luk2302
Mar 7 at 16:57
add a comment |
1 Answer
1
active
oldest
votes
The main issue is this bit of code
a.getClass()
What it will return is not the class of the component of the array, but the array itself, e.g.
[Ljava.lang.Integer
See the [L prefix. You need to use
a.getClass().getComponentType()
As Array#newInstance accepts the component type
newInstance(Class<?> componentType, int length)
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The main issue is this bit of code
a.getClass()
What it will return is not the class of the component of the array, but the array itself, e.g.
[Ljava.lang.Integer
See the [L prefix. You need to use
a.getClass().getComponentType()
As Array#newInstance accepts the component type
newInstance(Class<?> componentType, int length)
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
add a comment |
The main issue is this bit of code
a.getClass()
What it will return is not the class of the component of the array, but the array itself, e.g.
[Ljava.lang.Integer
See the [L prefix. You need to use
a.getClass().getComponentType()
As Array#newInstance accepts the component type
newInstance(Class<?> componentType, int length)
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
add a comment |
The main issue is this bit of code
a.getClass()
What it will return is not the class of the component of the array, but the array itself, e.g.
[Ljava.lang.Integer
See the [L prefix. You need to use
a.getClass().getComponentType()
As Array#newInstance accepts the component type
newInstance(Class<?> componentType, int length)
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
The main issue is this bit of code
a.getClass()
What it will return is not the class of the component of the array, but the array itself, e.g.
[Ljava.lang.Integer
See the [L prefix. You need to use
a.getClass().getComponentType()
As Array#newInstance accepts the component type
newInstance(Class<?> componentType, int length)
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
answered Mar 7 at 17:01
LppEddLppEdd
9,09621647
9,09621647
add a comment |
add a comment |
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Use
java.util.Arrays#copyOf(U[], int, java.lang.Class<? extends T[]>)– luk2302
Mar 7 at 16:57