package net.println.kotlin.chapter4

/**
 * @author:wangdong
 * @description:類(lèi)實(shí)現(xiàn)接口的沖突問(wèn)題
 */

interface B{
  fun x(): Int = 1
}

interface C{
  fun x(): Int = 0
}

/**一個(gè)類(lèi)實(shí)現(xiàn)了兩個(gè)接口，兩個(gè)接口中的方法相同，這個(gè)類(lèi)在覆寫(xiě)的時(shí)候就會(huì)出現(xiàn)沖突*/
class D: B,C{
  //當(dāng)下面兩個(gè)方法同時(shí)存在的時(shí)候，就會(huì)報(bào)方法相同的沖突
  override fun x(): Int {
    return super<B>.x()
  }

  override fun x(): Int {
    return super<C>.x()
  }
}

package net.println.kotlin.chapter4

/**
 * @author:wangdong
 * @description:類(lèi)繼承類(lèi)，實(shí)現(xiàn)接口的方法沖突問(wèn)題
 * 接口方法可以有默認(rèn)的實(shí)現(xiàn)
 * 簽名一致且返回值相同的沖突
 * 子類(lèi)（實(shí)現(xiàn)類(lèi)）必須覆寫(xiě)沖突方法
 * super<[父類(lèi)（接口）名]>.[方法名]([參數(shù)列表])
 */

abstract class A{
  open fun x(): Int = 5
}

interface B{
  fun x(): Int = 1
}

interface C{
  fun x(): Int = 0
}

/**一個(gè)類(lèi)實(shí)現(xiàn)了兩個(gè)接口，兩個(gè)接口中的方法相同，這個(gè)類(lèi)在覆寫(xiě)的時(shí)候就會(huì)出現(xiàn)沖突*/
/**采用分支模式解決沖突問(wèn)題*/
class D(var y: Int = 0):A() ,B,C{

  //返回值一定要一樣啊，例如：一定要是Int
  override fun x(): Int {
    println("call x(): Int in D")
    if (y > 0){
      return y
    }else if (y < -200){
      return super<C>.x()
    }else if (y < -100){
      return super<B>.x()
    }else{
      return super<A>.x()
    }
  }
}

fun main(args: Array<String>) {
  println(D(3).x())
  println(D(-10).x())
  println(D(-110).x())
  println(D(-230).x())
}
/**輸出的結(jié)果*/
call x(): Int in D

call x(): Int in D

call x(): Int in D

call x(): Int in D

public class Java extends Language 
  implements JVMRunnable{  
  ...
}

public class Kotlin extends Language 
  implements JVMRunnable, FERunnable{  
  ...
}

public class Java extends Language 
  implements JVMRunnable{  
  public void runOnJVM(){    
    ...
  }
}

public class Kotlin extends Language 
  implements JVMRunnable, FERunnable{  
  public void runOnJVM(){    
    ...
  }  
  
  public void runOnFE(){    
    ...
  }
}

public abstract class JVMLanguage{  
  public void runOnJVM(){    
    ...
  }
}
    
public class Java extends JVMLanguage{

}

public class Kotlin extends JVMLanguage 
  implements FERunnable{  
  
  public void runOnFE(){    
    ...
  }
}

public interface JVMRunnable{
  default void runOnJVM(){    
    ...
  }
}
    
public class Java extends Language 
  implements JVMRunnable{

}
  
public class Kotlin extends Language 
  implements JVMRunnable, FERunnable{  
  public void runOnFE(){    
    ...
  }
}

abstract class Languageinterface JVMRunnable{  
  fun runOnJVM()
}

class DefaultJVMRunnable : JVMRunnable {  
  override fun runOnJVM() {
    println("running on JVM!")
  }
}

class Java(jvmRunnable: JVMRunnable) 
  : Language(), JVMRunnable by jvmRunnable

class Kotlin(jvmRunnable: JVMRunnable) 
  : Language(), JVMRunnable by jvmRunnable, FERunnable{  
  fun runOnFE(){    
    ...
  }
}