lower the number of javac warnings

Author: thurka

visualvm/libs.profiler/lib.profiler.ui/src/org/graalvm/visualvm/lib/ui/cpu/CCTDisplay.java

@@ -25,6 +25,7 @@
 
 package org.graalvm.visualvm.lib.ui.cpu;
 
+import java.awt.AWTKeyStroke;
 import java.awt.BorderLayout;
 import java.awt.KeyboardFocusManager;
 import java.awt.Rectangle;

visualvm/libs.profiler/lib.profiler.ui/src/org/graalvm/visualvm/lib/ui/cpu/StatisticsPanel.java

@@ -47,6 +47,7 @@
 import java.awt.event.MouseMotionAdapter;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 import java.util.ResourceBundle;
 import java.util.concurrent.CopyOnWriteArraySet;
 import javax.swing.BorderFactory;

visualvm/libs.profiler/lib.profiler.ui/src/org/graalvm/visualvm/lib/ui/locks/LockContentionPanel.java

@@ -24,6 +24,7 @@
  */
 package org.graalvm.visualvm.lib.ui.locks;
 
+import java.awt.AWTKeyStroke;
 import java.awt.BorderLayout;
 import java.awt.CardLayout;
 import java.awt.Color;

visualvm/libs.profiler/lib.profiler.ui/src/org/graalvm/visualvm/lib/ui/memory/AllocResultsPanel.java

@@ -25,6 +25,7 @@
 
 package org.graalvm.visualvm.lib.ui.memory;
 
+import java.awt.AWTKeyStroke;
 import java.awt.KeyboardFocusManager;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;

visualvm/libs.profiler/lib.profiler.ui/src/org/graalvm/visualvm/lib/ui/memory/LivenessResultsPanel.java

@@ -25,6 +25,7 @@
 
 package org.graalvm.visualvm.lib.ui.memory;
 
+import java.awt.AWTKeyStroke;
 import java.awt.KeyboardFocusManager;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;

visualvm/libs.profiler/lib.profiler.ui/src/org/graalvm/visualvm/lib/ui/memory/MemoryResultsPanel.java

@@ -29,6 +29,7 @@
 import java.awt.event.*;
 import java.awt.image.BufferedImage;
 import java.util.ArrayList;
+import java.util.List;
 import java.util.ResourceBundle;
 import javax.swing.*;
 import javax.swing.event.ChangeEvent;

visualvm/libs.profiler/lib.profiler.ui/src/org/graalvm/visualvm/lib/ui/memory/SampledResultsPanel.java

@@ -24,6 +24,7 @@
  */
 package org.graalvm.visualvm.lib.ui.memory;
 
+import java.awt.AWTKeyStroke;
 import java.awt.KeyboardFocusManager;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;