Associative array/Iteration: Difference between revisions
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(→{{header|Java}}: consistent formatting, cleanup) |
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=={{header|Java}}== |
=={{header|Java}}== |
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<lang java>Map<String, Integer> |
<lang java>Map<String, Integer> map = new HashMap<String, Integer>(); |
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map.put("hello", 1); |
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map.put("world", 2); |
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map.put("!", 3); |
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// iterating over key-value pairs: |
// iterating over key-value pairs: |
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for (Map.Entry<String, Integer> e : |
for (Map.Entry<String, Integer> e : map.entrySet()) { |
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String key = e.getKey(); |
String key = e.getKey(); |
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Integer value = e.getValue(); |
Integer value = e.getValue(); |
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// iterating over keys: |
// iterating over keys: |
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for (String key : |
for (String key : map.keySet()) { |
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System.out.println("key = " + key); |
System.out.println("key = " + key); |
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} |
} |
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// iterating over values: |
// iterating over values: |
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for (Integer value : |
for (Integer value : map.values()) { |
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System.out.println("value = " + value); |
System.out.println("value = " + value); |
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}</lang> |
}</lang> |
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Java 8 version |
Java 8 version |
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<lang java>Map<String, Integer> |
<lang java>Map<String, Integer> map = new HashMap<>(); |
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map.put("hello", 1); |
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map.put("world", 2); |
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map.put("!", 3); |
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// iterating over key-value pairs: |
// iterating over key-value pairs: |
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map.forEach((k, v) -> { |
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System.out.printf("key = %s, value = %s%n", k, v); |
System.out.printf("key = %s, value = %s%n", k, v); |
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}); |
}); |
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// iterating over keys: |
// iterating over keys: |
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map.keySet().forEach(k -> System.out.printf("key = %s%n", k)); |
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// iterating over values: |
// iterating over values: |
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map.values().forEach(v -> System.out.printf("value = %s%n", v));</lang> |
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{{out}} |
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<pre>key = !, value = 3 |
<pre>key = !, value = 3 |
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key = world, value = 2 |
key = world, value = 2 |
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