【Groovy】Groovy 动态语言特性 ( Groovy 中函数实参自动类型推断 | 函数动态参数注意事项 )

class Student {
    def hello(){
        println "Hello Student"
    }
}
class Worker {
    def hello(){
        println "Hello Worker"
    }
}

void fun(object) {
    object.hello()
}

fun(new Student())
fun(new Worker())

class Farmer {}

fun(new Farmer())

Caught: groovy.lang.MissingMethodException: No signature of method: Farmer.hello() is applicable for argument types: () values: []
Possible solutions: sleep(long), sleep(long, groovy.lang.Closure), getAt(java.lang.String), each(groovy.lang.Closure), split(groovy.lang.Closure), wait()
groovy.lang.MissingMethodException: No signature of method: Farmer.hello() is applicable for argument types: () values: []
Possible solutions: sleep(long), sleep(long, groovy.lang.Closure), getAt(java.lang.String), each(groovy.lang.Closure), split(groovy.lang.Closure), wait()
  at Worker$hello.call(Unknown Source)
  at Groovy.fun(Groovy.groovy:17)
  at Groovy$fun.callCurrent(Unknown Source)
  at Groovy.run(Groovy.groovy:22)

@TypeChecked
void fun(Student object) {
    object.hello()
}

class Student {
    def hello(){
        println "Hello Student"
    }
}
class Worker {
    def hello(){
        println "Hello Worker"
    }
}
class Farmer {}
void fun(object) {
    object.hello()
}
fun(new Student())
fun(new Worker())
// 下面的用法会报 Caught: groovy.lang.MissingMethodException 异常
//fun(new Farmer())

Hello Student
Hello Worker