liuhaozzu opened a new pull request #81: add lambdas function to provide default value in MapUtils URL: https://github.com/apache/commons-collections/pull/81 For the code MapUtils.getString(map, key, defaultValue);, the default value is not always a constant. Sometimes we may need to do some calculate. Sometimes I do it like this: MapUtils.getLong(map, key, getDefaultValue()); private Long getDefaultValue() { return System.currentTimeMillis(); } you see, now the problem is that even if the value associated with the key exists, the getDefaultValue method will still be invoked and excuted which is a kind of waste. As we can use lambdas in Java8 or above, there is a better way to do it now. MapUtils.getLong(map, key, (key)->{ return System.currentTimeMillis(); }); by passing a lambdas to provide the default value, the lambdas will only be excuted when the value does not exist.
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