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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. Given:
1 . public class Test {
2 . public static void main (String args[]) {
3 .class Foo {
4 .public int i = 3;
5 .}
6 .Object o = (Object) new Foo();
7 .Foo foo = (Foo)o;
8 .System.out.printIn(foo. i);
9 .}
1 0. }
What is the result?

A) Compilation will fail.
B) Compilation will succeed but the program will throw a ClassCastException at line 7.
C) Compilation will succeed and the program will print "3"
D) Compilation will succeed but the program will throw a ClassCastException at line 6.

2. Exhibit:
1 . class super {
2 .public int getLength(){return 4;}
3 .}
4 .
5 . public class Sub extends Super {
6 .public long getLength() {return 5;}
7 .
8 . public static void main (String[]args){
9 .super sooper = new Super ();
1 0. Sub sub = new Sub();
1 1. System.out.printIn(
1 2.sooper.getLength()+ "," + sub.getLength()};
1 3.}
1 4. }
What is the output?

A) The code will not compile.
B) 5, 4
C) 4, 4
D) 5, 5
E) 4, 5

3. Given:
1 . public class X {
2 . public object m () {
3 . object o = new float (3.14F);
4 . object [] oa = new object [1];
5 . oa[0]= o;
6 . o = null;
7 . oa[0] = null;
9 . return o;
9 . }
1 0.}
When is the float object created in line 3, eligible for garbage collection?

A) Just after line 8(that is, as the method returns).
B) Just after line 7.
C) Just after line 6.
D) Just after line 5.

4. Given:
1 . public class test (
2 . public static void main (String args[]){
3 .int i = 0xFFFFFFF1;
4 .int j = ~i;
5 .
6 .}
7 . )
What is the decimal value of j at line 5?

A) 0
B) 1
C) -15
D) 14
E) An error at line 3 causes compilation to fail.
F) An error at line 4 causes compilation to fail.

5. Given:
1 . public class ConstOver {
2 . public ConstOver (int x, int y, int z){
3 .}
4 . }
Which two overload the ConstOver constructor? (Choose Two)

A) Public void ConstOver (byte x, byte y, byte z) { }
B) Private ConstOver (int z, int y, byte x) { }
C) Public Object ConstOver (int x, int y, int z) { }
D) Protected int ConstOver ( ) { }
E) ConstOver ( ) { }

Solutions: