本文介紹了最好的Java5種遍歷HashMap數(shù)據(jù)的寫法，分享給大家，也給自己留一個筆記，具體如下：

通過EntrySet的迭代器遍歷

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());
}

輸出結(jié)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

通過KeySet的迭代器遍歷

Iterator < Integer > iterator = coursesMap.keySet().iterator();
while (iterator.hasNext()) {
 Integer key = iterator.next();
 System.out.print(key + ". ");
 System.out.println(coursesMap.get(key));
}

輸出結(jié)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

通過ForEach循環(huán)遍歷

for (Map.Entry < Integer, String > entry: coursesMap.entrySet()) {
 System.out.print(entry.getKey() + ". ");
 System.out.println(entry.getValue());
}

輸出結(jié)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

通過Lambda表達(dá)式遍歷

coursesMap.forEach((key, value) -> {
 System.out.print(key + ". ");
 System.out.println(value);
});

輸出結(jié)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

通過Stream API遍歷

coursesMap.entrySet().stream().forEach((entry) -> {
 System.out.print(entry.getKey() + ". ");
 System.out.println(entry.getValue());
});

輸出結(jié)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

完整示例代碼在這里

到此這篇關(guān)于Java5種遍歷HashMap數(shù)據(jù)的寫法的文章就介紹到這了,更多相關(guān)Java遍歷HashMap內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！