本文介绍了最好的Java5种遍历HashMap数据的写法,分享给大家,也给自己留一个笔记,具体如下:
通过EntrySet的迭代器遍历
Iterator < Entry < Integer, String >> iterator = coursesMap.entrySet().iterator(); while (iterator.hasNext()) { Entry < Integer, String > entry = iterator.next(); System.out.print(entry.getKey() + ". "); System.out.println(entry.getValue()); }
输出结果如下:
zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 1
TIOBE Index for March 2020:
1. Java
2. C
3. Python
4. C++
5. C#
6. Visual Basic .NET
7. JavaScript
8. PHP
9. SQL
10. GO
通过KeySet的迭代器遍历
Iterator < Integer > iterator = coursesMap.keySet().iterator(); while (iterator.hasNext()) { Integer key = iterator.next(); System.out.print(key + ". "); System.out.println(coursesMap.get(key)); }
输出结果如下:
zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 2
TIOBE Index for March 2020:
1. Java
2. C
3. Python
4. C++
5. C#
6. Visual Basic .NET
7. JavaScript
8. PHP
9. SQL
10. GO
通过ForEach循环遍历
for (Map.Entry < Integer, String > entry: coursesMap.entrySet()) { System.out.print(entry.getKey() + ". "); System.out.println(entry.getValue()); }
输出结果如下:
zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 3
TIOBE Index for March 2020:
1. Java
2. C
3. Python
4. C++
5. C#
6. Visual Basic .NET
7. JavaScript
8. PHP
9. SQL
10. GO
通过Lambda表达式遍历
coursesMap.forEach((key, value) -> { System.out.print(key + ". "); System.out.println(value); });
输出结果如下:
zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 4
TIOBE Index for March 2020:
1. Java
2. C
3. Python
4. C++
5. C#
6. Visual Basic .NET
7. JavaScript
8. PHP
9. SQL
10. GO
通过Stream API遍历
coursesMap.entrySet().stream().forEach((entry) -> { System.out.print(entry.getKey() + ". "); System.out.println(entry.getValue()); });
输出结果如下:
zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 5
TIOBE Index for March 2020:
1. Java
2. C
3. Python
4. C++
5. C#
6. Visual Basic .NET
7. JavaScript
8. PHP
9. SQL
10. GO
完整示例代码在这里
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