java groovy 两个list string 其中一个代表所有另一个代表已使用 生成出未使用的list

以下是Java的实现方法：

List<String> allList = Arrays.asList("A", "B", "C", "D", "E");
List<String> usedList = Arrays.asList("A", "C", "E");

List<String> unusedList = new ArrayList<>(allList);
unusedList.removeAll(usedList);

System.out.println("All List: " + allList);
System.out.println("Used List: " + usedList);
System.out.println("Unused List: " + unusedList);

输出结果：

All List: [A, B, C, D, E]
Used List: [A, C, E]
Unused List: [B, D]

以下是Groovy的实现方法：

def allList = ["A", "B", "C", "D", "E"]
def usedList = ["A", "C", "E"]

def unusedList = allList - usedList

println "All List: $allList"
println "Used List: $usedList"
println "Unused List: $unusedList"

输出结果：

All List: [A, B, C, D, E]
Used List: [A, C, E]
Unused List: [B, D]
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