如何在 Java 中将 LinkedHashMap 转换成两个数组？
原文:https://www . geesforgeks . org/how-convert-link edhashmap-to-two-array-in-Java/
LinkedHashMap 是 java 中的一个预定义类，类似于 HashMap 。LinkedHashMap 和 HashMap 的唯一区别是 LinkedHashMap 保留插入顺序，而 HashMap 不保留插入顺序。LinkedHashMap 可以在 java 中转换成两个 array，其中一个 array 用于 LinkedHashMap 中的键，另一个 array 用于 Values。
例:
Input : LinkedHashMap = [2=6, 3=4, 5=7, 4=6]
Output:
Array of keys = [2, 3, 5, 4]
Array of Values = [6, 4, 7, 6]
Input : LinkedHashMap = [1=a, 2=b, 3=c, 4=d]
Output:
Array of keys = [1, 2, 3, 4]
Array of Values = [a, b, c, d]
算法:
- Enter in the LinkedHashMap with keys and respective values.
- Create an array with the same data type as the key in LinkedHashMap.
- Create another array with the same data type as the value in LinkedHashMap.
- 开始 LinkedHashMap 遍历。
- Copy each key and value in two arrays.
- After traversing, print two arrays.
下面是上述方法的实现:
T3】JavaT5
// Java Program to Convert LinkedHashMap to Two Arrays
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
LinkedHashMap<Integer, Integer> lhm
= new LinkedHashMap<>();
lhm.put(2, 6);
lhm.put(3, 4);
lhm.put(5, 7);
lhm.put(4, 6);
lhm.put(6, 8);
Integer[] Keys = new Integer[lhm.size()];
Integer[] Values = new Integer[lhm.size()];
int i = 0;
// Using for-each loop
for (Map.Entry mapElement : lhm.entrySet()) {
Integer key = (Integer)mapElement.getKey();
// Add some bonus marks
// to all the students and print it
int value = ((int)mapElement.getValue());
Keys[i] = key;
Values[i] = value;
i++;
}
// printing all the element of array contain keys
System.out.print("Array of Key -> ");
for (Integer key : Keys) {
System.out.print(key + ", ");
}
// iterate value array
System.out.println();
System.out.print("Array of Values -> ");
for (Integer value : Values) {
System.out.print(value + ", ");
}
}
}
T6T8输出T1
时间复杂度: O(n)
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