Use Collection.isEmpty() instead of size() == 0

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1199986 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

src/main/java/org/apache/commons/io/FileSystemUtils.java

@@ -507,7 +507,7 @@ List<String> performCommand(String[] cmdAttribs, int max, long timeout) throws I
                         "Command line returned OS error code '" + proc.exitValue() +
                         "' for command " + Arrays.asList(cmdAttribs));
             }
-            if (lines.size() == 0) {
+            if (lines.isEmpty()) {
                 // unknown problem, throw exception
                 throw new IOException(
                         "Command line did not return any info " +

src/main/java/org/apache/commons/io/FilenameUtils.java

@@ -1350,7 +1350,7 @@ static String[] splitOnTokens(String text) {
                 }
                 if (array[i] == '?') {
                     list.add("?");
-                } else if (list.size() == 0 ||
+                } else if (list.isEmpty() ||
                         (i > 0 && list.get(list.size() - 1).equals("*") == false)) {
                     list.add("*");
                 }

src/main/java/org/apache/commons/io/filefilter/AndFileFilter.java

@@ -116,7 +116,7 @@ public void setFileFilters(final List<IOFileFilter> fileFilters) {
      */
     @Override
     public boolean accept(final File file) {
-        if (this.fileFilters.size() == 0) {
+        if (this.fileFilters.isEmpty()) {
             return false;
         }
         for (IOFileFilter fileFilter : fileFilters) {
@@ -132,7 +132,7 @@ public boolean accept(final File file) {
      */
     @Override
     public boolean accept(final File file, final String name) {
-        if (this.fileFilters.size() == 0) {
+        if (this.fileFilters.isEmpty()) {
             return false;
         }
         for (IOFileFilter fileFilter : fileFilters) {