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){ }

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){}

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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.

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

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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.

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