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Java - Code Samples

 Sample 1. Make a map readonly using Apache Commons UnmodifiableMap

Map<String,String> map = new HashMap();
map.put("Key1", "Value1");

Map<String,String> unmodifiableMap = UnmodifiableMap.unmodifiableMap(map);
      
unmodifiableMap.put("Key2", "Value2"); // throws java.lang.UnsupportedOperationException

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