java.lang.UnsupportedClassVersionError: javax/swing/JFormattedTextField (Unsupported major.minor version 48.0)

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java.lang.UnsupportedClassVersionError: javax/swing/JFormattedTextField (Unsupported major.minor version 48.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at filecollection.FileCollectionClass.(FileCollectionClass.java:20)
at filecollection.FileCollectionClass.main(FileCollectionClass.java:50)

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