From 8a40b0fcb35e80dba385f411943fb9e88e64f7e4 Mon Sep 17 00:00:00 2001
From: jlhde123 <472327024@qq.com>
Date: Thu, 9 Mar 2017 13:24:26 +0800
Subject: [PATCH 1/2] =?UTF-8?q?hashset=20=E5=AD=A6=E4=B9=A0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/com/jlh/viewer/HashSetTestList.java  | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 jlh/src/main/java/com/jlh/viewer/HashSetTestList.java

diff --git a/jlh/src/main/java/com/jlh/viewer/HashSetTestList.java b/jlh/src/main/java/com/jlh/viewer/HashSetTestList.java
new file mode 100644
index 0000000..c028b67
--- /dev/null
+++ b/jlh/src/main/java/com/jlh/viewer/HashSetTestList.java
@@ -0,0 +1,70 @@
+package com.jlh.viewer;
+
+import java.util.HashSet;
+
+/**
+ * Created by jlh
+ * On 2017/3/9 0009.
+ */
+public class HashSetTestList {
+    public static void main(String[] args) {
+        //通过hashmap 来实现，所以基本上和hashmap差不多 ，，每次add的时候其实就是调用了hashmap.put("key",PERCENT) PERCENT 是一个静态Object对象用于标识这个Key存在了
+        HashSet<Tuple> hashSet = new HashSet<>();
+        //hashset 判断key是否存在的标准是 equal 和hashcode 的相等与否 缺一不可
+        hashSet.add(new Tuple("jlh","123"));
+        hashSet.add(new Tuple("jlh","123"));
+        hashSet.stream().forEach(System.out::println);
+    }
+
+    public static class Tuple{
+        private String name;
+        private String address;
+
+        public Tuple(String name, String address) {
+            this.name = name;
+            this.address = address;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+
+            Tuple tuple = (Tuple) o;
+
+            if (name != null ? !name.equals(tuple.name) : tuple.name != null) return false;
+            return address != null ? address.equals(tuple.address) : tuple.address == null;
+        }
+
+        @Override
+        public int hashCode() {
+            int result = name != null ? name.hashCode() : 0;
+            result = 31 * result + (address != null ? address.hashCode() : 0);
+            return result;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public String getAddress() {
+            return address;
+        }
+
+        public void setAddress(String address) {
+            this.address = address;
+        }
+
+        @Override
+        public String toString() {
+            return "Tuple{" +
+                    "name='" + name + '\'' +
+                    ", address='" + address + '\'' +
+                    '}';
+        }
+    }
+}
-- 
Gitee


From 7c374ea6fb2b1f9460d786484bd4e8307dd0b17f Mon Sep 17 00:00:00 2001
From: jlhde123 <472327024@qq.com>
Date: Thu, 9 Mar 2017 13:25:20 +0800
Subject: [PATCH 2/2] =?UTF-8?q?hashset=20=E5=AD=A6=E4=B9=A0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 jlh/src/main/java/com/jlh/viewer/HashSetTestList.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/jlh/src/main/java/com/jlh/viewer/HashSetTestList.java b/jlh/src/main/java/com/jlh/viewer/HashSetTestList.java
index c028b67..5a706d9 100644
--- a/jlh/src/main/java/com/jlh/viewer/HashSetTestList.java
+++ b/jlh/src/main/java/com/jlh/viewer/HashSetTestList.java
@@ -11,6 +11,7 @@ public class HashSetTestList {
         //通过hashmap 来实现，所以基本上和hashmap差不多 ，，每次add的时候其实就是调用了hashmap.put("key",PERCENT) PERCENT 是一个静态Object对象用于标识这个Key存在了
         HashSet<Tuple> hashSet = new HashSet<>();
         //hashset 判断key是否存在的标准是 equal 和hashcode 的相等与否 缺一不可
+        //  因为hashmap找bucket的时候需要hash 然后找到bucket的时候找entry需要equal 所以两者都要
         hashSet.add(new Tuple("jlh","123"));
         hashSet.add(new Tuple("jlh","123"));
         hashSet.stream().forEach(System.out::println);
-- 
Gitee