original questions 1Z0-851 Oracle cert24

original questions 1Z0-851 Oracle cert24

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original questions 1Z0-851 Oracle cert24

QUESTION 1
A team of programmers is involved in reviewing a proposed design for a new utility class. After some discussion, they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself. What design issue has the team discovered?

A. Tight coupling
B. Low cohesion
C. High cohesion
D. Loose coupling
E. Weak encapsulation
F. Strong encapsulation

Answer: E

QUESTION 2
Given a method that must ensure that its parameter is not null:

11. public void someMethod(Object value) {
12. // check for null value
…
20. System.out.println(value.getClass());
21. }

What, inserted at line 12, is the appropriate way to handle a null value?

A. assert value == null;
B. assert value != null, “value is null”;
C. if (value == null) { throw new AssertionException(“value is null”); }
D. if (value == null) { throw new IllegalArgumentException(“value is null”); }

Answer: D

QUESTION 3
Given:

public class Target {
private int i = 0;
public int addOne() {
return ++i;
}
}

And:

public class Client {
public static void main(String[] args){
System.out.println(new Target().addOne());
}
}

Which change can you make to Target without affecting Client?

A. Line 4 of class Target can be changed to return i++;
B. Line 2 of class Target can be changed to private int i = 1;
C. Line 3 of class Target can be changed to private int addOne(){
D. Line 2 of class Target can be changed to private Integer i = 0;

Answer: D

original questions 1Z0-851 Oracle cert24