{"id":65128,"date":"2020-08-31T06:40:29","date_gmt":"2020-08-31T06:40:29","guid":{"rendered":"https:\/\/www.baeldung.com\/?p=86393"},"modified":"2020-08-31T06:40:29","modified_gmt":"2020-08-31T06:40:29","slug":"guide-to-arraystoreexception","status":"publish","type":"post","link":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/2020\/08\/31\/guide-to-arraystoreexception\/","title":{"rendered":"Guide to ArrayStoreException"},"content":{"rendered":"

<\/p>\n

1. Overview<\/strong><\/h2>\n
<\/div>\n

ArrayStoreException<\/em> is thrown at runtime in Java when an attempt is made to store the incorrect type of object in an array of objects<\/a><\/strong>. Since ArrayStoreException<\/em> is an unchecked exception<\/a>, it isn’t typical to handle or declare it.<\/p>\n

In this tutorial, we’ll demonstrate the cause of ArrayStoreException<\/em>, how to handle it, and best practices for avoiding it.<\/p>\n

2. Causes of ArrayStoreException<\/em><\/strong><\/h2>\n
<\/div>\n

Java throws an ArrayStoreException<\/em> when we try to store a different type of object in an array instead of the declared type.<\/p>\n

Suppose we instantiated an array with String<\/em> type and later tried to store Integer<\/em> in it. In this case, during runtime, ArrayStoreException<\/em> is thrown:<\/p>\n

Object array[] = new String[5];\r\narray[0] = 2;<\/code><\/pre>\n
The exception will be thrown at the second line of code when we try to store an incorrect value type in the array:<\/p>\n
Exception in thread \"main\" java.lang.ArrayStoreException: java.lang.Integer\r\n    at com.baeldung.array.arraystoreexception.ArrayStoreExceptionExample.main(ArrayStoreExceptionExample.java:9)<\/code><\/pre>\n
Since we declared array<\/em> as an Object<\/em>, the compilation is error-free<\/strong>.<\/p>\n
3. Handling the ArrayStoreException<\/em><\/strong><\/h2>\n
<\/div>\n
The handling of this exception is pretty straightforward. As any other exception, it also needs to be surrounded in a try-catch block<\/a><\/strong> for handling:<\/p>\n
try{\r\n\u00a0\u00a0\u00a0 Object array[] = new String[5];\r\n    array[0] = 2;\r\n}\r\ncatch (ArrayStoreException e) {\r\n    \/\/ handle the exception\r\n}<\/code><\/pre>\n
4. Best Practices to Avoid this Exception<\/strong><\/h2>\n
<\/div>\n
It is recommended to declare the array type as a specific class, such as String<\/em> or Integer<\/em>, instead of Object<\/em><\/strong>. When we declare the array type as Object,<\/em> then the compiler will not throw any error.<\/p>\n
But declaring the array with the base class and then storing objects of a different class will lead to a compilation error<\/strong>. Let’s see this with a quick example:<\/p>\n
String array[] = new String[5];\r\narray[0] = 2;<\/code><\/pre>\n
In the above example, we declare the array type as String\u00a0<\/em>and try to store an Integer\u00a0<\/em>in it. This will lead to a compilation error:<\/p>\n
Exception in thread \"main\" java.lang.Error: Unresolved compilation problem: \r\n  Type mismatch: cannot convert from int to String\r\n    at com.baeldung.arraystoreexception.ArrayStoreExampleCE.main(ArrayStoreExampleCE.java:8)<\/code><\/pre>\n
It’s better if we catch errors at compile-time rather than runtime<\/strong> as we have more control over the former.<\/p>\n
5. Conclusion<\/strong><\/h2>\n
<\/div>\n
In this tutorial, we learned the causes, handling, and prevention of ArrayStoreException<\/em> in Java.<\/p>\n
The complete example is available\u00a0over on GitHub<\/a>.<\/p>\n
The post Guide to ArrayStoreException<\/a> first appeared on Baeldung<\/a>.<\/p>\n
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<\/p>","protected":false},"excerpt":{"rendered":"
Learn the cause of ArrayStoreException<\/em>, how to handle it, and best practices for avoiding it<\/p>\n
The post Guide to ArrayStoreException<\/a> first appeared on Baeldung<\/a>.<\/p>\n
<\/a> <\/a> <\/a> <\/a> <\/a> <\/a> <\/a> <\/a> <\/div>\n<\/div>","protected":false},"author":214,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"Guide to ArrayStoreException - ITTeacherITFreelance.hk","description":"Learn the cause of ArrayStoreException , how to handle it, and best practices for avoiding it The post Guide to ArrayStoreException first appeared on Baeldung ."},"footnotes":""},"categories":[6],"tags":[4955],"_links":{"self":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/65128"}],"collection":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/214"}],"replies":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=65128"}],"version-history":[{"count":8,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/65128\/revisions"}],"predecessor-version":[{"id":68590,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/65128\/revisions\/68590"}],"wp:attachment":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=65128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=65128"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=65128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}