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Test Yourself in Chapter 2

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1. Suppose you have the String S="SELECT". What is the return value of s.substring(0, 5)?
"SELE" "ELECT" "SELECT" "SELEC"
2. Which of the following is not a method of Scanner class?
nextByte() next() nextChar() None of the above
3. Which of the following statements correctly creates a Scanner object for keyboard input?
Scanner kbd = new Scanner(System.keyboard); Scanner keyboard = new Scanner(System.in); Scanner keyboard(System.in); Keyboard scanner = new Keyboard(System.in);
4. What is the Java expression for 4a^2 + 2b × c ?
(4 * a) + (2 * b) * c (4 * a * a) + ((2 * b) * c) ((4 * a * a) + (2 * b)) * c (4 + a * a) + ((2 + b) * c)
5. int x, y, z; x = 10; y = 7; z = (--x) + y++; System.out.println("x = " + x + ", y = " + y + ", z = " + z);
x = 9, y = 8, z = 17 x = 9, y = 8, z = 16 x = 10, y = 7, z = 17 x = 9, y = 7, z = 16
6. The expression (int)(76.0252175 * 100) / 100 evaluates to
76.02 76 76.025215 76.03
7. Which of the following statement prints smith\exam1\test.txt ?
System.out.println("smith\exam1\test.txt"); System.out.println("smith\\exam1\\test.txt"); System.out.println("smith\"exam1\"test.txt"); System.out.println("smith"\exam1"\test.txt");