1.迭代器 EntrySet

public class HashMapTest {public static void main(String[] args) {// 創建并賦值 HashMapMap<Integer, String> map = new HashMap();map.put(1, "Java");map.put(2, "JDK");map.put(3, "Spring Framework");map.put(4, "MyBatis framework");map.put(5, "Java中文社群");// 遍歷Iterator<Map.Entry<Integer, String>> iterator = map.entrySet().iterator();while (iterator.hasNext()) {Map.Entry<Integer, String> entry = iterator.next();System.out.print(entry.getKey());System.out.print(entry.getValue());}} }

2、迭代器 KeySet

public class HashMapTest {public static void main(String[] args) {// 創建并賦值 HashMapMap<Integer, String> map = new HashMap();map.put(1, "Java");map.put(2, "JDK");map.put(3, "Spring Framework");map.put(4, "MyBatis framework");map.put(5, "Java中文社群");// 遍歷Iterator<Integer> iterator = map.keySet().iterator();while (iterator.hasNext()) {Integer key = iterator.next();System.out.print(key);System.out.print(map.get(key));}} }

3.ForEach EntrySet

public class HashMapTest {public static void main(String[] args) {// 創建并賦值 HashMapMap<Integer, String> map = new HashMap();map.put(1, "Java");map.put(2, "JDK");map.put(3, "Spring Framework");map.put(4, "MyBatis framework");map.put(5, "Java中文社群");// 遍歷for (Map.Entry<Integer, String> entry : map.entrySet()) {System.out.print(entry.getKey());System.out.print(entry.getValue());}} }

4.ForEach KeySet

public class HashMapTest {public static void main(String[] args) {// 創建并賦值 HashMapMap<Integer, String> map = new HashMap();map.put(1, "Java");map.put(2, "JDK");map.put(3, "Spring Framework");map.put(4, "MyBatis framework");map.put(5, "Java中文社群");// 遍歷for (Integer key : map.keySet()) {System.out.print(key);System.out.print(map.get(key));}} }

5.Lambda

public class HashMapTest {public static void main(String[] args) {// 創建并賦值 HashMapMap<Integer, String> map = new HashMap();map.put(1, "Java");map.put(2, "JDK");map.put(3, "Spring Framework");map.put(4, "MyBatis framework");map.put(5, "Java中文社群");// 遍歷map.forEach((key, value) -> {System.out.print(key);System.out.print(value);});} }

總結

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