I don't know how to do Question 4 & 5. Using Java Eclipse IDE

Coding Exercise Question: 4. (3 pts) create a method to search a tree node with target value in regular binary tree, Return the value if this value exists in the binary tree. Return null if not exists. 5. (1 pts) use at least one example to test your method. Example 1: Input: {1, 2, 3), and target value = 3 Output: 3 Explanation: there's a tree node with target value in this binary tree. 1 / 1 3 2 Example 2: Input: {1, 2, #, 3, 4), and target value = 3 Output: 3 Explanation: there's a tree node with target value in this binary tree. 1 2 7 . 3 4