JAVAssd3选择题答案全

Multiple-Choice Quiz 1 aaaba aadda 1.Which method must exist in every Java application? (a) main (b) paint (c) begin (d) init 2.Which of the following is the string concatenation operator in Java? (a) + (b) ^ (c) & (d) ++ 3.Which of the following statements is (are) true about the use of an asterisk (*) in a Java import statement? I. It does not incur run-time overhead. II. It can be used to import multiple packages with a single statement. III. It can be used to import multiple classes with a single statement . (a) I and III only (b) III only (c) I only (d) I, II, and III 4.A difference between the methods print and println of the class java.io.PrintWriter is that (a) print inserts a new line at the beginning of its output, but println does not (b) println appends a new line to the end of its output, but print does not (c) println inserts a new line at the beginning of its output, but print does not (d) print appends a new line to the end of its output, but println does not 5.What will be output when the following Java program segment is executed? int x = 5; int y = 2; System.out.println(x + y);//这种运算是顺序进行的，试试System.out.println(x + y + “1”); (a) 7 (b) 5 2 (c) 5+2 (d) 52 6.What is the right way to handle abnormalities in input on Java? (a) By handling these problems by providing exception handlers (b) By writing while loops to guard against bad input (c) By using the class FileFilter which gracefully filters out bad input data (d) By always specifying the throws clause in every method header where file I/O is performed 7.All Java exception classes are derived from the class (a) java.lang.Throwable (b) java.lang.Error (c) java.io.IOException (d) java.lang.RuntimeException