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Java经典笔试题01
1. Given:
1. public class test (
2. public static void main (String args[]) {
3. int i = 0xFFFFFFF1; //0001
4. int j = ~i;//1110，取反
5.
6. }
7. )
What is the decimal value of j at line 5?
A. 0
B. 1
C. 14
D. -15
E. An error at line 3 causes compilation to fail.
F. An error at line 4 causes compilation to fail.
2. Given:
Integer i = new Integer (42);
Long 1 = new Long (42);
Double d = new Double (42.0);
Which two expressions evaluate to True? (Choose Two)
A. (i ==1)
B. (i == d)
C. (d == 1)
D. (i.equals (d))
E. (d.equals (i))
F. (i.equals (42))
3. Click the exhibit button:
1. public class test (
2. private static int j = 0;
3.
4. private static boolean methodB(int k) (
5. j += k;
6. return true;
7. )
8.
9. public static void methodA(int i) {
10. boolean b;
11. b = i 10 | methodB (4);//非短路
12. b = i 10 || methodB (8);//短路，后面不执行
13. )
14.
15. public static void main (String args[] } (
16. methodA (0);
17. system.out.printIn(j);
18. )
19. )
What is the result?
A. The program prints “0”
B. The program prints “4”
C. The program prints “8”
D. The program prints “12”
E. The code does not complete
4. Given:
1.Public class test (
2. Public static void main (String args[]) (
3. System.out.printIn (6 ^ 3); //0110 ^ 0011 = 0101
4. )
5.)
What is the output? 5
Which statement is correctly declare a variable a which is suitable for refering to an array of 50 string empty object? （长度为50的空数组引用） A. String [] a B. String a[] C. char a[][] D. String a[50] F. Object a[50]
Which is corrected argument of main() method of application? A. String args B. String ar[] C. Char args[][] D. StringBuffer arg[]
Select valid identifier of Java: A. userName B. %passwd C. 3d_game D. $charge
E. this
Which are Java keyword? A. goto B. null C. FALSE D. native E. const
Give the following java class: public class Example{ publ
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