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检查下面的代码: class E1 extends Exception{ } class E2 extends E1 { } public class Test{ public static void main(String[] args){ try{ throw new E1(); } // --X-- } } 下列语句,哪些可以放到--X--位置,而且保证编译成功。

A.catch(Exception x){ }

B.catch(Test x) { }

C.catch(E1 x){ }

D.catch(E2 x){ }


参考答案和解析
catch(Exception x){};catch(El x){}
更多 “检查下面的代码: class E1 extends Exception{ } class E2 extends E1 { } public class Test{ public static void main(String[] args){ try{ throw new E1(); } // --X-- } } 下列语句,哪些可以放到--X--位置,而且保证编译成功。A.catch(Exception x){ }B.catch(Test x) { }C.catch(E1 x){ }D.catch(E2 x){ }” 相关考题
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考题 单选题class Base {  Base() { System.out.print(“Base”); }  }  public class Alpha extends Base {  public static void main( String[] args ) {  new Alpha();  new Base();  }  }  What is the result?()A  BaseB  BaseBaseC  Compilation fails.D  The code runs with no output.E  An exception is thrown at runtime.

考题 单选题现有  class Parser extends Utils {  public static void main (String  []  args)  {  try  {  System.out.print (new Parser () .getlnt ("42"))       }  catch (Exception e) {  System.out.println ("Exc") ;  }      }  int getlnt (String arg)  throws Exception  {     return Integer.parselnt (arg) ;      }      }  class Utils {  int getlnt ()  {  return 42;  }     }  结果是什么?()A  42ExcB  ExcC  42D 编译失败

考题 单选题public class A extends Thread {  A() {  setDaemon(true);  }  public void run() {  (new B()).start();  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“A done”);  }  class B extends Thread {  public void run() {  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“B done”);  }  }  public static void main(String[] args) {  (new A()).start();  }  }   What is the result?()A  A doneB  B doneC  A done B doneD  B done A doneE  There is no exception that the application will print anything.F  The application outputs “A done” and “B done”, in no guaranteed order.

考题 单选题class TestA {  public void start() { System.out.println(”TestA”); }  }  public class TestB extends TestA {  public void start() { System.out.println(”TestB”); } public static void main(String[] args) {  ((TestA)new TestB()).start();  }  }  What is the result?()A  TestAB  TestBC  Compilation fails.D  An exception is thrown at runtime.

考题 单选题下列程序的运行结果是(  )。class Shape{ public Shape(){ System.out.print("Shape"); }}class Circle extends Shape{ public Circle(){ System.out.print("Circle"); }}public class Test{ public static void main(String[]args){ Shape d=new Circle(); }}A ShapeB CircleC ShapeCircleD 程序有错误