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NO.1 Given:
Why will the code not compile?
A. A static field cannot be private.
B. The getLetter method has no body.
C. There is no setLetter method.
D. The letter field is uninitialized.
E. It contains a method named Main instead of ma
Answer: B

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Explanation:
The getLetter() method needs a body public static int getLetter() { }; .

NO.2 public class ForTest {
public static void main(String[] args) {
int[] arrar = {1,2,3};
for ( foo ) {
} } }
Which three are valid replacements for foo so that the program will compiled and run?
A. int i: array
B. int i = 0; i < 1; i++
C. ;;
D. ; i < 1; i++
E. ; i < 1;
Answer: A,B,C

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NO.3 Given: Which two declarations will compile?
A. int a, b, c = 0;
B. int a, b, c;
C. int g, int h, int i = 0;
D. int d, e, F;
E. int k, l, m; = 0;
Answer: A,D

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NO.4 Which three statements are true about the structure of a Java class?
A. A class can have only one private constructor.
B. A method can have the same name as a field.
C. A class can have overloaded static methods.
D. A public class must have a main method.
E. The methods are mandatory components of a class.
F. The fields need not be initialized before use.
Answer: A,B,C

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Explanation:
A:Private constructors prevent a class from being explicitly instantiated by its callers. If the
programmer does not provide a constructor for a class, then the system will always provide a default,
public no-argument constructor. To disable this default constructor, simply add a private no-
argument constructor to the class. This private constructor may be empty.
B: The following works fine:
int cake() {
int cake=0;
return (1);
}
C: We can overload static method in Java. In terms of method overloading static method are just
like normal methods and in order to overload static method you need to provide another static
method with same name but different method signature.
Incorrect:
Not D: Only a public class in an application need to have a main method.
Not E:
Example:
class A
{
public string something;
public int a;
}
Q:What do you call classes without methods?
Most of the time: An anti pattern.
Why? Because it faciliates procedural programming with "Operator" classes and data structures.
You separate data and behaviour which isn't exactly good OOP.
Often times: A DTO (Data Transfer Object)
Read only datastructures meant to exchange data, derived from a business/domain object.
Sometimes: Just data structure.
Well sometimes, you just gotta have those structures to hold data that is just plain and simple and
has no operations on it.
Not F: Fields need to be initialtized. If not the code will not compile.
Example:
Uncompilable source code - variable x might not have been initialized

NO.5 Given:
import java.util.*;
public class Ref {
public static void main(String[] args) {
StringBuilder s1 = new StringBuilder("Hello Java!");
String s2 = s1.toString();
List<String> lst = new ArrayList<String>();
lst.add(s2);
System.out.println(s1.getClass());
System.out.println(s2.getClass());
System.out.println(lst.getClass());
}
}
What is the result?
A. class java.lang.String class java.lang.String class java.util.ArrayList
B. class java.lang.Object class java.lang.Object class java.util.Collection
C. class java.lang.StringBuilder class java.lang.String class java.util.ArrayList
D. class java.lang.StringBuilder class java.lang.String class java.util.List
Answer: C

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