Kotlin中每个类只允许一个伴随对象

Question

I was switching from Java to kotlin for Android Devlopment. When I searched about equivalent of Java static methods in Kotlin, I found that companion object is. But the problem is while creating more than one static methods in kotlin. I get these errors only one companion object is allowed per class.

Answer 1

You can put multiple methods and properties inside an object . They're just like classes, but they have a single instance.

class A {
    companion object {
        fun a() {}
        fun b() {}

        val x = 42
        var y = "foo"
    }
}

Answer 2

If you can set it as

class C {
    companion object {
        @JvmStatic fun foo() {}
        fun bar() {}
    }
}

See this link for static method

Answer 3

You can put one or more than one methods and variables inside **campanion object ** Let see example below

class DialogClass {

companion object {
    fun DialogMethod(context: Context) {
        val dialog = Dialog(context)
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
        dialog.setContentView(R.layout.activity_main)
        dialog.show()
    }
    fun AnotherMethod() {
        // Implement own logic here.
    }
    }
    }