java期末复习题汇总.docVIP

End-of-line comments that should be ignored by the compiler are denoted using Two forward slashes ( // ). Three forward slashes ( /// ). A slash and a star ( /* ). A slash and two starts ( /** ). ANS: a. Two forward slashes ( // ). Which of the following is not a valid Java identifier? my Value $_AAA1 width m_x ANS: a. my Value (Identifiers may not contain blanks). Which of the following cannot cause a syntax error to be reported by the Java compiler? Mismatched {} Missing */ in a comment that begins with /* Missing ; Extra blank lines. ANS: d. Extra blank lines. Which of the following is not a syntax error? System.out.println( Hello world! ): System.out.println( Hello  world! ); System.out.println( Hello world! ); System.out.println( Hello world! ); ANS: c. System.out.println( Hello world! ); Which command compiles the Java source code file Welcome.java? cd Welcome.java javac Welcome.java java Welcome.java compile Welcome.java ANS: b. javac Welcome.java Which command executes the Java class file Welcome.class? javac Welcome.class java Welcome.class java Welcome run Welcome.class ANS: c. java Welcome Which is the output of the following statements? System.out.print( Hello ); System.out.println( World ); Hello World HelloWorld HelloWorld WorldHello ANS: a. Hello World Which of the following characters is the escape character? * \ \n ANS: b. \ Which of the following statements will print a single line containing hello there? System.out.println( hello );System.out.println( there ); System.out.println( hello , there ); System.out.println( hello );System.out.print( there ); System.out.print( hello ); System.out.println( there ); ANS: d. System.out.print( hello ); System.out.println( there ); Which of the following escape sequences represents carriage return? \n. \r. \cr. \c. ANS: b. \r. Which of the following statements would display the phase Java is fun? System.out.println( hellois fun\rJava ); System.out.println( Java is