Associative array/Creation: Difference between revisions
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<syntaxhighlight lang="java">Int? mightBeNull = map["foo"]; |
<syntaxhighlight lang="java">Int? mightBeNull = map["foo"]; |
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Int neverNull = map.getOrDefault("foo", 0); |
Int neverNull = map.getOrDefault("foo", 0); |
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if (Int n := map.get("foo")) |
if (Int n := map.get("foo")) { |
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{ |
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// if "foo" is in the map, then the variable "n" is set to its value |
// if "foo" is in the map, then the variable "n" is set to its value |
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} |
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{ |
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// if "foo" is not in the map, then the variable "n" is not defined |
// if "foo" is not in the map, then the variable "n" is not defined |
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}</syntaxhighlight> |
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Iterate over keys: |
Iterate over keys: |
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<syntaxhighlight lang="java">for (String key : map) |
<syntaxhighlight lang="java">for (String key : map) { |
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{ |
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// the variable "key" is defined here |
// the variable "key" is defined here |
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}</syntaxhighlight> |
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Iterate over values: |
Iterate over values: |
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<syntaxhighlight lang="java">for (Int value : map.values) |
<syntaxhighlight lang="java">for (Int value : map.values) { |
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{ |
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// the variable "value" is defined here |
// the variable "value" is defined here |
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}</syntaxhighlight> |
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Iterate over key, value pairs: |
Iterate over key, value pairs: |
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<syntaxhighlight lang="java">for ((String key, Int value) : map) |
<syntaxhighlight lang="java">for ((String key, Int value) : map) { |
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{ |
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// the variables "key" and "value" are defined here |
// the variables "key" and "value" are defined here |
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}</syntaxhighlight> |
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=={{header|Elena}}== |
=={{header|Elena}}== |
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