From 91d20bdcb9229d1b46ffce6e293e455f26c23237 Mon Sep 17 00:00:00 2001
From: weiranyi <168578203@qq.com>
Date: Sun, 3 Jan 2021 16:43:53 +0800
Subject: [PATCH 1/3] =?UTF-8?q?=E9=87=8D=E5=86=99=E4=BA=86equals=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95=E5=92=8CHashCode=E6=96=B9=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/com/github/hcsp/collection/Main.java | 25 +++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/github/hcsp/collection/Main.java b/src/main/java/com/github/hcsp/collection/Main.java
index ae0f842..33b550f 100644
--- a/src/main/java/com/github/hcsp/collection/Main.java
+++ b/src/main/java/com/github/hcsp/collection/Main.java
@@ -1,12 +1,19 @@
 package com.github.hcsp.collection;
 
-import java.util.Arrays;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.Arrays;
+import java.util.Objects;
 
 public class Main {
     // 请编写一个方法，获得a和b集合中的公共元素。
-    public static Set<Person> commonElementsIn(List<Person> a, List<Person> b) {}
+    public static Set<Person> commonElementsIn(List<Person> a, List<Person> b) {
+        Set<Person> setA = new HashSet<>(a);
+        Set<Person> setB = new HashSet<>(b);
+        setA.retainAll(setB);
+        return setA;
+    }
 
     // Person类，如果两个Person对象的name相等，则认为这两个对象相等。
     public static class Person {
@@ -23,6 +30,19 @@ public String getName() {
         public void setName(String name) {
             this.name = name;
         }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            Person person = (Person) o;
+            return Objects.equals(name, person.name);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name);
+        }
     }
 
     public static void main(String[] args) {
@@ -31,3 +51,4 @@ public static void main(String[] args) {
         System.out.println(commonElementsIn(list1, list2));
     }
 }
+

From 72f77104e287d203e0567cd2e082b776f5cbc646 Mon Sep 17 00:00:00 2001
From: weiranyi <168578203@qq.com>
Date: Sun, 3 Jan 2021 16:55:53 +0800
Subject: [PATCH 2/3] =?UTF-8?q?=E9=87=8D=E5=86=99=E4=BA=86equals=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95=E5=92=8CHashCode=E6=96=B9=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/com/github/hcsp/collection/Main.java   | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/main/java/com/github/hcsp/collection/Main.java b/src/main/java/com/github/hcsp/collection/Main.java
index 33b550f..79d5ec7 100644
--- a/src/main/java/com/github/hcsp/collection/Main.java
+++ b/src/main/java/com/github/hcsp/collection/Main.java
@@ -9,10 +9,11 @@
 public class Main {
     // 请编写一个方法，获得a和b集合中的公共元素。
     public static Set<Person> commonElementsIn(List<Person> a, List<Person> b) {
-        Set<Person> setA = new HashSet<>(a);
-        Set<Person> setB = new HashSet<>(b);
-        setA.retainAll(setB);
-        return setA;
+        Set<Person> set = new HashSet<>();
+        set.addAll(a);
+        set.retainAll(b);
+        return set;
+
     }
 
     // Person类，如果两个Person对象的name相等，则认为这两个对象相等。
@@ -33,8 +34,12 @@ public void setName(String name) {
 
         @Override
         public boolean equals(Object o) {
-            if (this == o) return true;
-            if (o == null || getClass() != o.getClass()) return false;
+            if (this == o){
+                return true;
+            }
+            if (o == null || getClass() != o.getClass()){
+                return false;
+            }
             Person person = (Person) o;
             return Objects.equals(name, person.name);
         }

From 4fe9e871d9d74ab4f6d14413afbdd61cbcb6a711 Mon Sep 17 00:00:00 2001
From: weiranyi <168578203@qq.com>
Date: Sun, 3 Jan 2021 16:57:57 +0800
Subject: [PATCH 3/3] =?UTF-8?q?=E9=87=8D=E5=86=99=E4=BA=86equals=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95=E5=92=8CHashCode=E6=96=B9=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/main/java/com/github/hcsp/collection/Main.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/github/hcsp/collection/Main.java b/src/main/java/com/github/hcsp/collection/Main.java
index 79d5ec7..900e80c 100644
--- a/src/main/java/com/github/hcsp/collection/Main.java
+++ b/src/main/java/com/github/hcsp/collection/Main.java
@@ -34,10 +34,10 @@ public void setName(String name) {
 
         @Override
         public boolean equals(Object o) {
-            if (this == o){
+            if (this == o) {
                 return true;
             }
-            if (o == null || getClass() != o.getClass()){
+            if (o == null || getClass() != o.getClass()) {
                 return false;
             }
             Person person = (Person) o;