代码之家 › 专栏 › 技术社区 › Serhii

Groovy阵列。[[],[]之间的区别。toArray()和[[],[]]*。toArray()

groovy arrays

Serhii · 技术社区 · 7 年前

我已经为中的参数化单元测试准备了数据 groovy

@Parameterized.Parameters
static List data() {
    [
            ['20101113', 'DATE',
             '20101114', 'DATE',
             'some statement',
             '20101101T000000/20110101T000000',
             null,
             ['some', 'expected', 'data', 'results']]
    // ...and other 
    ]*.toArray()
}

它工作正常。我检查了这段代码,并尝试简化替换 ]*.toArray() 具有 ].toArray()

java.lang.Exception: FirstParametrizedTest.data() must return a Collection of arrays.

at org.junit.runners.Parameterized$TestClassRunnerForParameters.computeParams(Parameterized.java:94)
at org.junit.runners.Parameterized$TestClassRunnerForParameters.createTest(Parameterized.java:86)
at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:236)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:233)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

我把找零的钱还给了他,但我不明白为什么 ].toArray() ].toArray() ].toArray() 和 ?

1 回复 | 直到 7 年前

aristotll 7 年前

从…起 doc 这个 *.

扩展运算符( *. )用于对聚合对象的所有项调用操作。这相当于对每个项目调用操作并将结果收集到列表中:

* , toArray

具有您当前的代码执行以下操作:

  static List data() {
        def result = []
        List input = [
                ['20101113', 'DATE',
                 '20101114', 'DATE',
                 'some statement',
                 '20101101T000000/20110101T000000',
                 null,
                 ['some', 'expected', 'data', 'results']]
                // ...and other
        ]

        for (def item : input) {
            result.add(item != null ? ((List) item).toArray() : null)
        }

        result
    }