diff --git a/problems/0070.爬楼梯.md b/problems/0070.爬楼梯.md
index f0a08f99..286e088f 100644
--- a/problems/0070.爬楼梯.md
+++ b/problems/0070.爬楼梯.md
@@ -213,6 +213,28 @@ public:
 
 Java：
 
+```java
+// 常规方式
+public int climbStairs(int n) {
+    int[] dp = new int[n + 1];
+    dp[0] = 1;
+    dp[1] = 1;
+    for (int i = 2; i <= n; i++) {
+        dp[i] = dp[i - 1] + dp[i - 2];
+    }
+    return dp[n];
+}
+// 用变量记录代替数组
+public int climbStairs(int n) {
+    int a = 0, b = 1, c = 0; // 默认需要1次
+    for (int i = 1; i <= n; i++) {
+        c = a + b;          // f(i - 1) + f(n - 2)
+        a = b;              // 记录上一轮的值
+        b = c;              // 向后步进1个数
+    }
+    return c;
+}
+```
 
 Python：