View Compilation Error

0_0_39901216_3737\Main.java:11: 错误: 需要class, interface或enum
    private static void buildPostOrder(int[] preorder, int preStart, int preEnd, 
                   ^
0_0_39901216_3737\Main.java:16: 错误: 需要class, interface或enum
        }
        ^
0_0_39901216_3737\Main.java:22: 错误: 需要class, interface或enum
        int rootIndexInInorder = inStart;
        ^
0_0_39901216_3737\Main.java:23: 错误: 需要class, interface或enum
        while (inorder[rootIndexInInorder] != rootValue) {
        ^
0_0_39901216_3737\Main.java:25: 错误: 需要class, interface或enum
        }
        ^
0_0_39901216_3737\Main.java:31: 错误: 需要class, interface或enum
        buildPostOrder(preorder, preStart + 1, preStart + leftSubtreeSize,
        ^
0_0_39901216_3737\Main.java:35: 错误: 需要class, interface或enum
        buildPostOrder(preorder, preStart + leftSubtreeSize + 1, preEnd,
        ^
0_0_39901216_3737\Main.java:39: 错误: 需要class, interface或enum
        postorder.add(rootValue);
        ^
0_0_39901216_3737\Main.java:40: 错误: 需要class, interface或enum
    }
    ^
9 个错误