Source Code for BAEL-2534 : Determine if all elements are the same in a Java list

2019-01-29 22:52:53 +01:00
parent f58d4a286c
commit 73f2a12c4e
3 changed files with 231 additions and 0 deletions
@@ -0,0 +1,43 @@
+package com.baeldung.allequalelements;
+
+import java.util.List;
+import org.apache.commons.collections4.IterableUtils;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterables;
+
+public class VerifyAllEqualListElements {
+
+    public boolean verifyAllEqualUsingALoop(List<String> list) {
+        for (String s : list) {
+            if(!s.equals(list.get(0)))
+                return false;
+        }
+        return true;
+    }
+
+    public boolean verifyAllEqualUsingStream(List<String> list) {
+          return list.stream().distinct().limit(2).count() <= 1;
+    }
+
+    public boolean verifyAllEqualAnotherUsingStream(List<String> list) {
+        return list.isEmpty() || list.stream().allMatch(list.get(0)::equals);
+    }
+
+
+    public boolean verifyAllEqualUsingGuava(List<String> list) {
+        return Iterables.all(list, new Predicate<String>() {
+            public boolean apply(String s) {
+                return s.equals(list.get(0));
+            }
+        });
+    }
+
+    public boolean verifyAllEqualUsingApacheCommon(List<String> list) {
+        return IterableUtils.matchesAll(list, new org.apache.commons.collections4.Predicate<String>() {
+            public boolean evaluate(String s) {
+                return s.equals(list.get(0));
+            }
+        });
+    }
+
+}