1. public class ReturnIt {
2. return Type methodA(byte x, double y) {
3. return (long)x / y * 2;
4. }
5. }
What is the narrowest valid returnType for methodA in line2?()
A. int
B. byte
C. long
D. short
E. float
F. double
您可能感兴趣的试卷
你可能感兴趣的试题
public class Test {
public static void main(String[] args) {
int x = 0;
assert (x > 0) ? “assertion failed” : “assertion passed”;
System.out.println(“Finished”);
}
}
What is the result?()
A. finished
B. Compilation fails.
C. An AssertionError is thrown and finished is output.
D. An AssertionError is thrown with the message “assertion failed”.
E. An AssertionError is thrown with the message “assertion passed”.
public class X {
public static void main(String [] args) {
try {
badMethod();
System.out.print(“A”);
}
catch (RuntimeException ex) {
System.out.print(“B”);
}
catch (Exception ex1) {
System.out.print(“C”);
}
finally {
System.out.print(“D”);
}
System.out.print(“E”);
}
public static void badMethod() {
throw new RuntimeException();
}
}
What is the result?()
A. BD
B. BCD
C. BDE
D. BCDE
E. ABCDE
F. Compilation fails.
switch(x) {
default:
System.out.println(“Hello”);
}
Which two are acceptable types for x?()
A. byte
B. long
C. char
D. float
E. Short
F. Long
A. public
B. private
C. protected
D. transient
E. default access
public class Test {
public static void main(String[] args) {
int x = 0;
assert (x > 0): “assertion failed”;
System.out.println(“finished”);
}
}
What is the result?()
A. finished
B. Compilation fails.
C. An AssertionError is thrown.
D. An AssertionError is thrown and finished is output.
A. 4,4
B. 4,5
C. 5,4
D. 5,5
E. Compilation fails.
public void test(int x) {
int odd = x%2;
if (odd) {
System.out.println(“odd);
} else {
System.out.println(“even”);
}
}
Which statement is true?()
A.Compilation fails.
B. “odd” will always be output.
C. “even” will always be output.
D. “odd” will be output for odd values of x, and “even” for even values.
E. “even” will be output for add values of x, and “odd” for even values.
class Super {
public int getLenght() { return 4; }
}
public class Sub extends Super {
public long getLenght() { return 5; }
public static void main(String[] args) {
Super sooper = new Super();
Sub sub = new Sub();
System.out.println(
sooper.getLenght() + “,” + sub.getLenght() );
}
}
What is the output?()
A. Just after line 13.
B. Just after line 14.
C. Just after line 15.
D. Just after line 16 (that is, as the method returns).
A. The default constructor initializes method variables.
B. The default constructor has the same access as its class.
C. The default constructor invoked the no-arg constructor of the superclass.
D. If a class lacks a no-arg constructor, the compiler always creates a default constructor.
E. The compiler creates a default constructor only when there are no other constructors for the class.
1. class TestA {
2. TestB b;
3. TestA() {
4. b = new TestB(this);
5. }
6. }
7. class TestB {
8. TestA a;
9. TestB(TestA a) {
10. this.a = a;
11. }
12. }
13. class TestAll {
14. public static void main (String args[]) {
15. new TestAll().makeThings();
16. // ...code continues on
17. }
18. void makeThings() {
19. TestA test = new TestA();
20. }
21. }
Which two statements are true after line 15, before main completes?()
A. Line 15 causes a stack overflow.
B. An exception is thrown at runtime.
C. The object referenced by a is eligible for garbage collection.
D. The object referenced by b is eligible for garbage collection.
E. The object referenced by a is not eligible for garbage collection.
F. The object referenced by b is not eligible for garbage collection.
最新试题
Which statement is true?()
Which two can be results?()
Given: foo and bar are public references available to many other threads, foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait(). From another thread, what provides the most reliable way to ensure that foo will stop executing wait()?()
Given that t1 is a reference to a live thread, which is true?()
A programmer must create a generic class MinMax and the type parameter of MinMax must implement Comparable. Which implementation of MinMax will compile?()
Which two of statements are true?()
What is the result?()
Which statement is true?()
What is the result?()
Which statement is true?()