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单选题 class A { public int getNumber() { return 1; }}public class B extends A { public int getNumber() { return 2; } public static void main(String[] args) { A b = new B(); System.out.println(b.getNumber()); }}
学科：Java程序设计(2023年秋季)
时间：2023-12-26 10:36:28
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题目1单选题
What assigns a value to foo that is closest to, but not greater than, a double value bar?注:哪一项赋一个最接近但不大于bar的值给fooA. int foo =(int)Math.max(bar)B. int foo =(int)Math.min(bar)C. int foo =(int)Math.abs(bar)D. int foo =(int)Math.ceil(bar)E. int foo =(int)Math.floor(bar)F. int foo =(int)Math.round(bar)
题目2单选题
class A { public int getNumber() { return 1; }}public class B extends A { public int getNumber() { return 2; } public static void main(String[] args) { A b = new B(); System.out.println(b.getNumber()); }}A. 1B. 2C. An exception is thrown at runtimeD. Compilation fails because of "A b = new B();"
题目3单选题
Given:String a = "ABCD";String b = a.toLowerCase();b.replace('a', 'd');b.replace('b', 'c');System.out.println(b);What is the resultA. abcdB. ABCDC. dccdD. dcbaE. Compilation failsF. An exception is thrown at runtime
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