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());}

輸出結果如下：

zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 1TIOBE Index for March 2020:1. Java2. C3. Python4. C++5. C#6. Visual Basic .NET7. JavaScript8. PHP9. SQL10. 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));}

輸出結果如下：

zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 2TIOBE Index for March 2020:1. Java2. C3. Python4. C++5. C#6. Visual Basic .NET7. JavaScript8. PHP9. SQL10. 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());}

輸出結果如下：

zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 3TIOBE Index for March 2020:1. Java2. C3. Python4. C++5. C#6. Visual Basic .NET7. JavaScript8. PHP9. SQL10. GO

通過Lambda表達式遍歷

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

輸出結果如下：

zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 4TIOBE Index for March 2020:1. Java2. C3. Python4. C++5. C#6. Visual Basic .NET7. JavaScript8. PHP9. SQL10. GO

通過Stream API遍歷

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

輸出結果如下：

zzw:how_iterate_hashmap_in_java zzw$ java IterateHashMapExample 5TIOBE Index for March 2020:1. Java2. C3. Python4. C++5. C#6. Visual Basic .NET7. JavaScript8. PHP9. SQL10. GO

完整示例代碼在這里

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