摘要: In Groovy we can group the elements of a Collection type in a map. We define the rule for grouping with a closure. The result is a map where the key is the grouping condition and the value contains the elements of the Collection type belonging to the key. Let's see the groupBy method in action:  阅读全文

     摘要:
Constructors in Groovy can be invoked in a classic Java way, but we can also use lists or maps to create objects. Groovy supports an explicit coersion of a list to a constructor with the as keyword. Or we can rely on the implicit coersion when Groovy looks at the type of the variable to automatically convert the list to the right constructor call.  阅读全文

     摘要: Groovy has some features and methods we can categorize as functional programming. The inject() method is a so called higher-order function. Other languages call it a fold, reduce or accumulate. The inject() method processes a data structure with a closure and builds up a return value. The first parameter of the inject() method is the first value of the intermediary results of the second parameter: the closure. When we use the inject() we don't introduce any side effects, because we build up the   阅读全文

     摘要: Groovy has some elegant ways to work with date and time values. One of them is the support of durations. We can define a duration to denote a certain time amount, like 7 days, 2 hours and 50 minutes. We can use these durations to add or subtract them from date and time objects.

The TimeCategory provides an even Groovier way to work with durations. We can use constructs like 7.days + 12.minutes to create a duration. When we read this code it is just like reading English text. Here is som  阅读全文

     摘要: Since Groovy 1.6 we can define and assign values to several variables at once. This is especially useful when a method returns multiple values and we want to assign them to separate variables.  阅读全文

     摘要: Groovy has a with method we can use to group method calls and property access to an object. The with method accepts a closure and every method call or property access in the closure applies to the object if applicable. The method is part of Groovy's extensions to the java.lang.Object class. Let's see this with an example:  阅读全文

     摘要: 制作图片缩略图的Groovy脚本  阅读全文

     摘要: 改文件名的Groovy代码  阅读全文

     摘要: 下划线分割字符串转换成驼峰式字符串的groovy脚本  阅读全文