int x = 3;
int y = 1;
if (x = y) {
System.out.println(“x = “ + x);
}
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.
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A. public
B. private
C. protected
D. transient
E. default access
int i = 1,j = 10;
do {
if(i>j) {
break;
}
j--;
} while (++i <5);
System.out.println(“i =” +i+” and j = “+j);
What is the result?()
A. i = 6 and j = 5
B. i = 5 and j = 5
C. i = 6 and j = 4
D. i = 5 and j = 6
E. i = 6 and j = 6
class A {
A() { }
}
class B extends A {
}
Which two statements are true?()
A. Class B’s constructor is public.
B. Class B’s constructor has no arguments.
C. Class B’s constructor includes a call to this().
D. Class B’s constructor includes a call to super().
interface Animal {
void soundOff();
}
class Elephant implements Animal {
public void soundOff() {
System.out.println(“Trumpet”);
}
}
class Lion implements Animal {
public void soundOff() {
System.out.println(“Roar”);
}
}
class Alpha1 {
static Animal get( String choice ) {
if ( choice.equalsIgnoreCase( “meat eater” )) {
return new Lion();
} else {
return new Elephant();
}
}
}
Which compiles?()
A. new Animal().soundOff();
B. Elephant e = new Alpha1();
C. Lion 1 = Alpha.get(“meat eater”);
D. new Alpha1().get(“veggie”).soundOff();
1. class Test {
2. private Demo d;
3. void start() {
4. d = new Demo();
5. this.takeDemo(d);
6. }
7.
8. void takeDemo(Demo demo) {
9. demo = null;
10. demo = new Demo();
11. }
12. }
When is the Demo object, created on line 3, eligible for garbage collection?()
A. After line 5.
B. After line 9.
C. After the start() method completes.
D. When the takeDemo() method completes.
E. When the instance running this code is made eligible for garbage collection.
A. float[] = new float(3);
B. float f2[] = new float[];
C. float[] f1 = new float[3];
D. float f3[] = new float[3];
E. float f5[] = { 1.0f, 2.0f, 2.0f };
F. float f4[] = new float[] { 1.0f. 2.0f. 3.0f};
public class Test {
public static void main(String args[]) {
class Foo {
public int i = 3;
}
Object o = (Object)new Foo();
Foo foo = (Foo)o;
System.out.println(“i = “ + foo.i);
}
}
What is the result?()
A. i = 3
B. Compilation fails.
C. A ClassCastException is thrown at line 6.
D. A ClassCastException is thrown at line 7.
A. Java.util.Map.
B. Java.util.List.
C. Java.util.Hashable.
D. Java.util.Collection.
A. Java.util.Map.
B. Java.util.Set.
C. Java.util.List.
D. Java.util.StoredSet.
E. Java.util.StoredMap.
F. Java.util.Collection.
public class X {
public object m () {
object o = new float (3.14F);
object oa = new object [1];
oa[0]= o;
o = null;
oa[0] = null;
return o;
}
}
When is the float object created in line 3, eligible for garbage collection?()
A. Just after line 5.
B. Just after line 6.
C. Just after line 7.
D. Just after line 8(that is, as the method returns).
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