Java 梯度任务列表

为什么下面的代码不向生成组添加任务：

apply plugin: 'java'
task hello << {
    description = 'To say hello to a task list'
    group = 'build'
}

但以下情况确实如此：

apply plugin: 'java'
task hello {
    description = 'To say hello to a task list'
    group = 'build'
}

gradle任务命令的输出：

Build tasks
-----------
assemble - Assembles the outputs of this project.
build - Assembles and tests this project.
buildDependents - Assembles and tests this project and all projects that depend
on it.
buildNeeded - Assembles and tests this project and all projects it depends on.
classes - Assembles classes 'main'.
clean - Deletes the build directory.
hello - To say hello to a task list
jar - Assembles a jar archive containing the main classes.
testClasses - Assembles classes 'test'.

---

由于您将任务配置与任务操作混合在一起，有关详细信息，请参阅

在这段代码中：

apply plugin: 'java'
task hello << {
    description = 'To say hello to a task list'
    group = 'build'
}

---

因为第一个变体是以下的缩写：

task hello

hello.doLast {
    description = 'To say hello to a task list'
    group = 'build'
}

apply plugin: 'java'
task hello {
    description = 'To say hello to a task list'
    group = 'build'
}

task hello

hello.doLast {
    description = 'To say hello to a task list'
    group = 'build'
}