Standard的apply函数

Posted 2022-04-28 zhangjin1120

apply是函数吗？

是的，内联扩展函数

怎么用？

下面是kotlin和java的转化：

//kotlin

fun main(args: Array<String>) 
    val user = User("Kotlin", 1, "1111111")

    val result = user.apply 
        println("my name is $name, I am $age years old, my phone number is $phoneNum")
        1000
    
    println("result: $result")


//java

public final class ApplyFunctionKt 
   public static final void main(@NotNull String[] args) 
      Intrinsics.checkParameterIsNotNull(args, "args");
      User user = new User("Kotlin", 1, "1111111");
      String var5 = "my name is " + user.getName() + ", I am " + user.getAge() + " years old, my phone number is " + user.getPhoneNum();
      System.out.println(var5);
      String var3 = "result: " + user;
      System.out.println(var3);
   

Kotlin系列之let、with、run、apply、also函数的使用