11. int x = 3;
12. int y = 1;
13. if (x = y) {
14. System.out.println("x = " + x);
15. }
What is the result?
A. x = 1
B. x = 3
C. Compilation fails.
D. The code runs with no output.
E. An exception is thrown at runtime.
컴파일 에러 if 는 true or false 만 가능
1. public class Test {
2. public static void aMethod() throws Exception {
3. try {
4. throw new Exception();
5. } finally {
6. System.out.println("finally");
7. }
8. }
9. public static void main(String args[]) {
10. try {
11. aMethod();
12. } catch (Exception e) {
13. System.out.println("exception");
14. }
15. System.out.println("finished");
16. }
17. }
What is the result?
A. finally
B. exception
finished
C. finally
exception
finished
D. Compilation fails.
씨 throw new Exception(); 이 관건.
Given:
1. public interface Foo {
2. int k = 4;
3. }
Which three are equivalent to line 2? (Choose three)
A. final int k = 4;
B. public int k = 4;
C. static int k = 4;
D. abstract int k = 4;
E. volatile int k = 4;
F. protected int k = 4;
public static final 생략
1. package test1;
2. public class Test1 {
3. static int x = 42;
4. }
1. package test2;
2. public class Test2 extends test1.Test1 {
3. public static void main(String[] args) {
4. System.out.println("x = " + x);
5. }
6. }
What is the result?
A. x = 0
B. x = 42
C. Compilation fails because of an error in line 2 of class Test2.
D. Compilation fails because of an error in line 3 of class Test1.
E. Compilation fails because of an error in line 4 of class Test2.
이 : 디폴트라 다른 패키지에서 접근 불가. public 이면 가능.
1. class A {
2. protected int method1(int a, int b) { return 0; }
3. }
Which two are valid in a class that extends class A? (Choose two)
A. public int method1(int a, int b) { return 0; }
B. private int method1(int a, int b) { return 0; }
C. private int method1(int a, long b) { return 0; }
D. public short method1(int a, int b) { return 0: }
E. static protected int method1(int a, int b) { return 0; }
에이씨 : 오버라이딩
1. public class Delta {
2. static boolean foo(char c) {
3. System.out.print(c);
4. return true;
5. }
6. public static void main( String[] argv ) {
7. int i =0;
8. for ( foo('A'); foo('B')&&(i<2); foo('C')){
9. i++ ;
10. foo('D');
12. }
13. }
14. }
What is the result?
A. ABDCBDCB
B. ABCDABCD
C. Compilation fails.
D. An exception is thrown at runtime.
에이. 이런 문제 참 좋은 문제.
