In Java, you can implement a hash table using the `HashMap` class from the Java Collections Framework. A hash table, also known as a hash map, is a data structure that allows you to store and retrieve key-value pairs efficiently. Here's how to implement a hash table in Java using `HashMap`:

1. Import the necessary Java classes:

```java
import java.util.HashMap;
```

2. Create an instance of the `HashMap` class:

```java
HashMap<String, Integer> hashMap = new HashMap<>();
```

In this example, we're creating a hash table that maps strings (keys) to integers (values). You can replace `String` and `Integer` with other data types as needed for your specific use case.

3. Add key-value pairs to the hash table:

```java
hashMap.put("Alice", 25);     // Add a key-value pair
hashMap.put("Bob", 30);       // Add another key-value pair
hashMap.put("Charlie", 22);   // Add one more key-value pair
```

The `put` method is used to add key-value pairs to the hash table.

4. Retrieve and process values based on keys:

```java
String name = "Bob";
if (hashMap.containsKey(name)) {
    int age = hashMap.get(name);  // Retrieve the value associated with the key "Bob"
    System.out.println(name + "'s age is " + age);
} else {
    System.out.println(name + " not found in the hash table.");
}
```

In this example, we check if the hash table contains a key ("Bob") using the `containsKey` method and then retrieve the associated value using the `get` method.

5. Remove key-value pairs from the hash table:

```java
String keyToRemove = "Charlie";
if (hashMap.containsKey(keyToRemove)) {
    int removedValue = hashMap.remove(keyToRemove);  // Remove the key-value pair
    System.out.println("Removed " + keyToRemove + "'s age: " + removedValue);
} else {
    System.out.println(keyToRemove + " not found in the hash table.");
}
```

The `remove` method is used to remove a key-value pair from the hash table.

6. Iterate over key-value pairs in the hash table:

```java
for (String key : hashMap.keySet()) {
    int value = hashMap.get(key);
    System.out.println(key + ": " + value);
}
```

You can use a `for` loop to iterate over the keys in the hash table using the `keySet` method and retrieve the corresponding values.

This example demonstrates the basic implementation of a hash table (hash map) in Java using the `HashMap` class. You can replace the data types as needed and perform various operations like insertion, retrieval, deletion, and iteration based on your specific requirements.