Free Oracle 1z0-808 Practice Test & Real Exam Questions
Given the code fragment?
public class Test {
public static void main(String[] args) {
Test t = new Test();
int[] arr = new int[10];
arr = t.subArray(arr,0,2);
}
// insert code here
}
Which method can be inserted at line // insert code here to enable the code to compile?
public class Test {
public static void main(String[] args) {
Test t = new Test();
int[] arr = new int[10];
arr = t.subArray(arr,0,2);
}
// insert code here
}
Which method can be inserted at line // insert code here to enable the code to compile?
Correct Answer: A
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Given:
What is the output?
What is the output?
Correct Answer: E
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Given the code fragment:
Test.java:
Which is the result?
Test.java:
Which is the result?
Correct Answer: E
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Given:
public class ComputeSum {
public int x;
public int y;
public int sum;
public ComputeSum (int nx, int ny) {
x = nx; y =ny;
updateSum();
}
public void setX(int nx) { x = nx; updateSum();}
public void setY(int ny) { x = ny; updateSum();}
void updateSum() { sum = x + y;}
}
This class needs to protect an invariant on the sum field.
Which three members must have the private access modifier to ensure that this invariant is maintained?
public class ComputeSum {
public int x;
public int y;
public int sum;
public ComputeSum (int nx, int ny) {
x = nx; y =ny;
updateSum();
}
public void setX(int nx) { x = nx; updateSum();}
public void setY(int ny) { x = ny; updateSum();}
void updateSum() { sum = x + y;}
}
This class needs to protect an invariant on the sum field.
Which three members must have the private access modifier to ensure that this invariant is maintained?
Correct Answer: A,B,C
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You are developing a banking module.
You have developed a class named ccMask that has a maskcc method.
Given the code fragment:
You must ensure that the maskcc method returns a string that hides all digits of the credit card number except the four last digits (and the hyphens that separate each group of four digits).
Which two code fragments should you use at line n1, independently, to achieve this requirement?
You have developed a class named ccMask that has a maskcc method.
Given the code fragment:
You must ensure that the maskcc method returns a string that hides all digits of the credit card number except the four last digits (and the hyphens that separate each group of four digits).
Which two code fragments should you use at line n1, independently, to achieve this requirement?
Correct Answer: A,B
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Given the fragments:
Which line causes a compilation error?
Which line causes a compilation error?
Correct Answer: A
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Given:
package pkg1;
class Bb { }
public class Ee {
private Ee() { }
}
package pkg2;
final class Ww;
package pkg3;
public abstract class Dd { void m() { } }
And,
1. package pkg4;
2. import pkg1.*;
3. import pkg2.*;
4. import pkg3.*;
5. // insert a class definition here
Which two class definitions, when inserted independently at line 5, enable the code to compile?
package pkg1;
class Bb { }
public class Ee {
private Ee() { }
}
package pkg2;
final class Ww;
package pkg3;
public abstract class Dd { void m() { } }
And,
1. package pkg4;
2. import pkg1.*;
3. import pkg2.*;
4. import pkg3.*;
5. // insert a class definition here
Which two class definitions, when inserted independently at line 5, enable the code to compile?
Correct Answer: C,D
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Given the code fragment:
int[] array = {I, 2, 3, 4, 5};
And given the requirements:
1. Process all the elements of the array in the order of entry.
2. Process all the elements of the array in the reverse order of entry.
3. Process alternating elements of the array in the order of entry.
Which two statements are true?
int[] array = {I, 2, 3, 4, 5};
And given the requirements:
1. Process all the elements of the array in the order of entry.
2. Process all the elements of the array in the reverse order of entry.
3. Process alternating elements of the array in the order of entry.
Which two statements are true?
Correct Answer: B,C
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Given:
and the code fragment:
What is the result?
and the code fragment:
What is the result?
Correct Answer: A
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Given:
What is the result?
What is the result?
Correct Answer: E
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