translation: Add Python and Java code for EN version (#1345)

* Add the intial translation of code of all the languages * test * revert * Remove * Add Python and Java code for EN version
2026-02-07 21:04:02 +08:00 · 2024-05-06 05:21:51 +08:00
parent b5e198db7d
commit 1c0f350ad6
174 changed files with 12349 additions and 0 deletions
--- a/en/codes/java/chapter_hashing/array_hash_map.java
+++ b/en/codes/java/chapter_hashing/array_hash_map.java
@@ -0,0 +1,141 @@
+/**
+ * File: array_hash_map.java
+ * Created Time: 2022-12-04
+ * Author: krahets (krahets@163.com)
+ */
+
+package chapter_hashing;
+
+import java.util.*;
+
+/* Key-value pair */
+class Pair {
+    public int key;
+    public String val;
+
+    public Pair(int key, String val) {
+        this.key = key;
+        this.val = val;
+    }
+}
+
+/* Hash table based on array implementation */
+class ArrayHashMap {
+    private List<Pair> buckets;
+
+    public ArrayHashMap() {
+        // Initialize an array, containing 100 buckets
+        buckets = new ArrayList<>();
+        for (int i = 0; i < 100; i++) {
+            buckets.add(null);
+        }
+    }
+
+    /* Hash function */
+    private int hashFunc(int key) {
+        int index = key % 100;
+        return index;
+    }
+
+    /* Query operation */
+    public String get(int key) {
+        int index = hashFunc(key);
+        Pair pair = buckets.get(index);
+        if (pair == null)
+            return null;
+        return pair.val;
+    }
+
+    /* Add operation */
+    public void put(int key, String val) {
+        Pair pair = new Pair(key, val);
+        int index = hashFunc(key);
+        buckets.set(index, pair);
+    }
+
+    /* Remove operation */
+    public void remove(int key) {
+        int index = hashFunc(key);
+        // Set to null, indicating removal
+        buckets.set(index, null);
+    }
+
+    /* Get all key-value pairs */
+    public List<Pair> pairSet() {
+        List<Pair> pairSet = new ArrayList<>();
+        for (Pair pair : buckets) {
+            if (pair != null)
+                pairSet.add(pair);
+        }
+        return pairSet;
+    }
+
+    /* Get all keys */
+    public List<Integer> keySet() {
+        List<Integer> keySet = new ArrayList<>();
+        for (Pair pair : buckets) {
+            if (pair != null)
+                keySet.add(pair.key);
+        }
+        return keySet;
+    }
+
+    /* Get all values */
+    public List<String> valueSet() {
+        List<String> valueSet = new ArrayList<>();
+        for (Pair pair : buckets) {
+            if (pair != null)
+                valueSet.add(pair.val);
+        }
+        return valueSet;
+    }
+
+    /* Print hash table */
+    public void print() {
+        for (Pair kv : pairSet()) {
+            System.out.println(kv.key + " -> " + kv.val);
+        }
+    }
+}
+
+public class array_hash_map {
+    public static void main(String[] args) {
+        /* Initialize hash table */
+        ArrayHashMap map = new ArrayHashMap();
+
+        /* Add operation */
+        // Add key-value pair (key, value) to the hash table
+        map.put(12836, "Ha");
+        map.put(15937, "Luo");
+        map.put(16750, "Suan");
+        map.put(13276, "Fa");
+        map.put(10583, "Ya");
+        System.out.println("\nAfter adding, the hash table is\nKey -> Value");
+        map.print();
+
+        /* Query operation */
+        // Enter key to the hash table, get value
+        String name = map.get(15937);
+        System.out.println("\nEnter student ID 15937, found name " + name);
+
+        /* Remove operation */
+        // Remove key-value pair (key, value) from the hash table
+        map.remove(10583);
+        System.out.println("\nAfter removing 10583, the hash table is\nKey -> Value");
+        map.print();
+
+        /* Traverse hash table */
+        System.out.println("\nTraverse key-value pairs Key->Value");
+        for (Pair kv : map.pairSet()) {
+            System.out.println(kv.key + " -> " + kv.val);
+        }
+        System.out.println("\nIndividually traverse keys Key");
+        for (int key : map.keySet()) {
+            System.out.println(key);
+        }
+        System.out.println("\nIndividually traverse values Value");
+        for (String val : map.valueSet()) {
+            System.out.println(val);
+        }
+    }
+}