实现Java接口- Kotlin

// Java接口
public interface MyInterface {
    void doSomething();
}

// Kotlin实现Java接口
class MyClass : MyInterface {
    override fun doSomething() {
        println("Doing something in Kotlin!")
    }
}

interface MyJavaInterface {
    fun getString(): String? // Java接口方法可能返回null
}

class MyKotlinClass : MyJavaInterface {
    override fun getString(): String? {
        return "Hello, Kotlin!"
    }
}

fun main() {
    val instance = MyKotlinClass()
    val str: String? = instance.getString()
    println(str?.length) // 使用安全调用操作符
}

interface MyJavaInterface {
    fun doSomething(param: String)
}

class MyKotlinClass : MyJavaInterface {
    override fun doSomething(param: String) {
        doSomethingInternal(param, "default")
    }

    private fun doSomethingInternal(param: String, defaultParam: String) {
        println("Param: $param, DefaultParam: $defaultParam")
    }
}