From 48f9150b9a04d2105c466e37acab35d578111d74 Mon Sep 17 00:00:00 2001
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 <30338551+YiwenXie@users.noreply.github.com>
Date: Wed, 12 May 2021 22:42:29 +0900
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200078.=E5=AD=90=E9=9B=86.md?=
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---
 problems/0078.子集.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/problems/0078.子集.md b/problems/0078.子集.md
index 8c68843d..77854133 100644
--- a/problems/0078.子集.md
+++ b/problems/0078.子集.md
@@ -177,7 +177,33 @@ public:
 
 
 Java：
+```java
+class Solution {
+    List<List<Integer>> result = new ArrayList<>();// 存放符合条件结果的集合
+    LinkedList<Integer> path = new LinkedList<>();// 用来存放符合条件结果
+    public List<List<Integer>> subsets(int[] nums) {
+        if (nums.length == 0){
+            result.add(new ArrayList<>());
+            return result;
+        }
+        Arrays.sort(nums);
+        subsetsHelper(nums, 0);
+        return result;
+    }
 
+    private void subsetsHelper(int[] nums, int startIndex){
+        result.add(new ArrayList<>(path));//「遍历这个树的时候，把所有节点都记录下来，就是要求的子集集合」。
+        if (startIndex >= nums.length){ //终止条件可不加
+            return;
+        }
+        for (int i = startIndex; i < nums.length; i++){
+            path.add(nums[i]);
+            subsetsHelper(nums, i + 1);
+            path.removeLast();
+        }
+    }
+}
+```
 
 Python：