How to determine whether a file is an image in java

Can be judged by using the substring() and equals() methods.

The substring() method returns the substring of a string.

The equals() method is used to determine whether the Number object and the method parameters are equal.

(Recommended video tutorial: java video)

Specific code:

String extension = "";
int i = fileName.lastIndexOf('.');
if (i > 0) {
    extension = fileName.substring(i+1);
}
//...
if("jpg".equals(extension)){
    //your code
}

Recommended tutorial: Getting started with java development

The above is the detailed content of How to determine whether a file is an image in java. For more information, please follow other related articles on the PHP Chinese website!