如果我希望像Kotlin中的静态函数一样使用语法，哪种方法更好? [英] Which way is better if I hope to use a syntax just like static function in Kotlin?

问题描述

我知道Kotlin中没有静态函数，所以我在myClass1.kt和myClass2.kt中编写了两个代码

I know there isn't a static function in Kotlin, so I write two code in myClass1.kt and myClass2.kt

我不知道哪个更好，你能告诉我吗?谢谢！

I don't know which is better, could you tell me? Thanks!

主要

class HomeActivity : DemoActivity() {    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        Display1(this)
        Utility.Display2(this)
    }
}

myClass1.kt

import android.content.Context
import android.widget.Toast

fun Display1(mContext: Context){
    Toast.makeText(mContext, "Hello, World 1", Toast.LENGTH_LONG).show();
}

myClass2.kt

import android.content.Context
import android.widget.Toast

object Utility {
    fun Display2(mContext: Context) {
        Toast.makeText(mContext, "Hello, World 2", Toast.LENGTH_LONG).show();
    }
}

推荐答案

让我们反编译kotlin字节码并查看Java代码.

Let us decompile the kotlin bytecode and see the java code.

myClass1.kt

public final class MyClass1Kt {
   public static final void Display1(@NotNull Context mContext) {
      Intrinsics.checkParameterIsNotNull(mContext, "mContext");
      Toast.makeText(mContext, (CharSequence)"Hello, World 1", 1).show();
   }

myClass2.kt

public final class Utility {
   public static final Utility INSTANCE;

   public final void Display2(@NotNull Context mContext) {
      Intrinsics.checkParameterIsNotNull(mContext, "mContext");
      Toast.makeText(mContext, (CharSequence)"Hello, World 2", 1).show();
   }

   private Utility() {
      INSTANCE = (Utility)this;
   }

   static {
      new Utility();
   }
}

第二种方法显然不是您想要的.有不需要的实例创建.

The second way is clearly not what you intended. There is an unneeded instance creation.

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