algorithm/hello-algo
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Format the Java codes with the Reat Hat extension.

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krahets
2023-04-14 00:12:10 +08:00
parent 7273ee24e8
commit f8513455b5
39 changed files with 195 additions and 205 deletions
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20
codes/java/chapter_hashing/array_hash_map.java
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@ -12,6 +12,7 @@ import java.util.*;
class Entry {
public int key;
public String val;
public Entry(int key, String val) {
this.key = key;
this.val = val;
@ -21,6 +22,7 @@ class Entry {
/* 基于数组简易实现的哈希表 */
class ArrayHashMap {
private List<Entry> buckets;
public ArrayHashMap() {
// 初始化数组，包含 100 个桶
buckets = new ArrayList<>();
@ -39,7 +41,8 @@ class ArrayHashMap {
public String get(int key) {
int index = hashFunc(key);
Entry pair = buckets.get(index);
if (pair == null) return null;
if (pair == null)
return null;
return pair.val;
}
@ -89,13 +92,12 @@ class ArrayHashMap {
/* 打印哈希表 */
public void print() {
for (Entry kv: entrySet()) {
for (Entry kv : entrySet()) {
System.out.println(kv.key + " -> " + kv.val);
}
}
}
public class array_hash_map {
public static void main(String[] args) {
/* 初始化哈希表 */
@ -103,9 +105,9 @@ public class array_hash_map {
/* 添加操作 */
// 在哈希表中添加键值对 (key, value)
map.put(12836, "小哈");
map.put(15937, "小啰");
map.put(16750, "小算");
map.put(12836, "小哈");
map.put(15937, "小啰");
map.put(16750, "小算");
map.put(13276, "小法");
map.put(10583, "小鸭");
System.out.println("\n添加完成后，哈希表为\nKey -> Value");
@ -124,15 +126,15 @@ public class array_hash_map {
/* 遍历哈希表 */
System.out.println("\n遍历键值对 Key->Value");
for (Entry kv: map.entrySet()) {
for (Entry kv : map.entrySet()) {
System.out.println(kv.key + " -> " + kv.val);
}
System.out.println("\n单独遍历键 Key");
for (int key: map.keySet()) {
for (int key : map.keySet()) {
System.out.println(key);
}
System.out.println("\n单独遍历值 Value");
for (String val: map.valueSet()) {
for (String val : map.valueSet()) {
System.out.println(val);
}
}