kotlin改善java代码实例分析

  @Test  fun testStringLiterals(){    val a = """if(a > 1) {     |  return a     |}""".trimMargin()    println(a)    val b = """Foo        Bar""".trimIndent()    println(b)  }

 @Test  fun testStringTemplate() {    val name = "hello kotlin"    println("Hello, $name!");    val data = listOf(1,2,3)    println("Hello, ${data[0]}!")  }

@Test  fun testForEachIndex(){    val items = listOf("apple", "banana", "kiwifruit")    for (index in items.indices) {      println("item at $index is ${items[index]}")    }  }

 //生成getter/setter，equals，hashcode，toString，copy等  //setter是var变量才有  data class Customer(val name: String, val email: String)  @Test  fun testDataClass(){    val customer = Customer("admin","admin@admin.com")    println(customer)  }

 @Test  fun testIfNotNull(){    val files = File("Test").listFiles()    println(files?.size) //null  }  @Test  fun testIfNotNullAndElse(){    val files = File("Test").listFiles()    println(files?.size ?: "empty")  }

// 如果 `person` 或者 `person.department` 其中之一为空，都不会调用该函数：person?.department?.head = managersPool.getManager()