单选题public class X {   public static void main (Stringargs) {   String s1 = new String (“true”);   Boolean b1 = new Boolean (true);   if (s2.equals(b1)) {   System.out.printIn(“Equal”);   }   }   }   What is the result? ()A The program runs and prints nothing.B The program runs and prints “Equal”C An error at line 5 causes compilation to fail.D The program runs but aborts with an exception.

单选题
public class X {   public static void main (Stringargs) {   String s1 = new String (“true”);   Boolean b1 = new Boolean (true);   if (s2.equals(b1)) {   System.out.printIn(“Equal”);   }   }   }   What is the result? ()
A

 The program runs and prints nothing.

B

 The program runs and prints “Equal”

C

 An error at line 5 causes compilation to fail.

D

 The program runs but aborts with an exception.


参考解析

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单选题public class X {   public static void main (Stringargs) {   int a = new int [1]   modify(a);   System.out.printIn(a[0]);   }   public static void modify (int a) {   a[0] ++;    }    }   What is the result?()A The program runs and prints “0”B The program runs and prints “1”C The program runs but aborts with an exception.D An error “possible undefined variable” at line 4 causes compilation to fail.E An error “possible undefined variable” at line 9 causes compilation to fail.

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