Add try() to manage opened files/rsrcs

Author: SalmaneKhalili

app/src/processing/app/Util.java

@@ -688,9 +688,7 @@ static private void packageListFromFolder(File dir, String sofar,
    * Ignores (does not extract) any __MACOSX files from macOS archives.
    */
   static public void unzip(File zipFile, File dest) throws IOException {
-    FileInputStream fis = new FileInputStream(zipFile);
-    CheckedInputStream checksum = new CheckedInputStream(fis, new Adler32());
-    ZipInputStream zis = new ZipInputStream(new BufferedInputStream(checksum));
+    try (ZipInputStream zis = new ZipInputStream( new BufferedInputStream( new CheckedInputStream( new FileInputStream(zipFile), new Adler32())))) {
     ZipEntry entry;
     while ((entry = zis.getNextEntry()) != null) {
       final String name = entry.getName();
@@ -710,6 +708,7 @@ static public void unzip(File zipFile, File dest) throws IOException {
       }
     }
   }
+  }
 
 
   static protected void unzipEntry(ZipInputStream zin, File f) throws IOException {