diff --git a/problems/背包理论基础01背包-1.md b/problems/背包理论基础01背包-1.md
index 6ff32017..fe940b4c 100644
--- a/problems/背包理论基础01背包-1.md
+++ b/problems/背包理论基础01背包-1.md
@@ -271,7 +271,7 @@ int main() {
 ### java 
 
 ```java
-    public static void main(string[] args) {
+    public static void main(String[] args) {
         int[] weight = {1, 3, 4};
         int[] value = {15, 20, 30};
         int bagsize = 4;
@@ -292,16 +292,16 @@ int main() {
                 if (j < weight[i - 1]){
                     dp[i][j] = dp[i - 1][j];
                 }else{
-                    dp[i][j] = math.max(dp[i - 1][j], dp[i - 1][j - weight[i - 1]] + value[i - 1]);
+                    dp[i][j] = Math.max(dp[i - 1][j], dp[i - 1][j - weight[i - 1]] + value[i - 1]);
                 }
             }
         }
         //打印dp数组
         for (int i = 0; i <= wlen; i++){
             for (int j = 0; j <= bagsize; j++){
-                system.out.print(dp[i][j] + " ");
+                System.out.print(dp[i][j] + " ");
             }
-            system.out.print("\n");
+            System.out.print("\n");
         }
     }
 ```