Java期末小测:基础知识快速回顾

快来看看你会不会!

  1. 想要创建一个ArrayList,它可是List接口的继承者,下面哪个写法是对的呢? A. ArrayList myList = new Object(); B. List myList = new ArrayList(); C. ArrayList myList = new List(); D. List myList = new List();
  2. 告诉大家一个小秘密,paint()方法它喜欢用哪种类型的参数? A. Graphics B. Graphics2D C. String D. Color
  3. 来吧,展示!下面哪个表达式写得最漂亮? A. byte = 128; B. Boolean = null; C. long l = 0xfffL; D. double = 0.9239d;
  4. 想知道下面这段程序运行后会发生什么吗?
public class Example {
 String str = new String("good");
  ···
}
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