Replace 'indexOf()' expression with 'contains()'

Change-Id: Ida566a24d78174690b11d758c769b1d559b7fae9
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/CherryPickDialog.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/CherryPickDialog.java
index 3ffd25f..1724f72 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/CherryPickDialog.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/CherryPickDialog.java
@@ -53,7 +53,7 @@
         LinkedList<BranchSuggestion> suggestions =
             new LinkedList<BranchSuggestion>();
         for (final BranchInfo b : branches) {
-          if (b.ref().indexOf(request.getQuery()) >= 0) {
+          if (b.ref().contains(request.getQuery())) {
             suggestions.add(new BranchSuggestion(b));
           }
         }
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/MorphingTabPanel.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/MorphingTabPanel.java
index 8c6fe07..f68480e 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/MorphingTabPanel.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/MorphingTabPanel.java
@@ -76,7 +76,7 @@
 
   public void setVisible(Widget w, boolean visible) {
     if (visible) {
-      if (visibles.indexOf(w) == -1) {
+      if (!visibles.contains(w)) {
         int origPos = widgets.indexOf(w);
 
         /* Re-insert the widget right after the first visible widget found
diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/StaticServlet.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/StaticServlet.java
index 3f4adba..52b7a5c9 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/StaticServlet.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/StaticServlet.java
@@ -151,7 +151,7 @@
 
   private static boolean isUnreasonableName(String name) {
     if (name.length() < 1) return true;
-    if (name.indexOf('\\') >= 0) return true; // no windows/dos stlye paths
+    if (name.contains("\\")) return true; // no windows/dos style paths
     if (name.startsWith("../")) return true; // no "../etc/passwd"
     if (name.contains("/../")) return true; // no "foo/../etc/passwd"
     if (name.contains("/./")) return true; // "foo/./foo" is insane to ask
diff --git a/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java b/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
index fb2f254..bd8f081 100644
--- a/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
+++ b/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
@@ -288,10 +288,10 @@
     // match the name it was in the archive.
     //
     String name = ze.getName();
-    if (0 <= name.lastIndexOf('/')) {
+    if (name.contains("/")) {
       name = name.substring(name.lastIndexOf('/') + 1);
     }
-    if (0 <= name.lastIndexOf('.')) {
+    if (name.contains(".")) {
       name = name.substring(0, name.lastIndexOf('.'));
     }
     if (name.isEmpty()) {
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/account/EmailExpander.java b/gerrit-server/src/main/java/com/google/gerrit/server/account/EmailExpander.java
index 59091e6..c664377 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/account/EmailExpander.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/account/EmailExpander.java
@@ -62,7 +62,7 @@
 
     @Override
     public boolean canExpand(final String user) {
-      return user.indexOf(' ') < 0;
+      return !user.contains(" ");
     }
 
     public String expand(final String user) {