Practice Declarations and Access Control –
What will be the output of the program?
public class X {
public static void main(String [] args) {
String names [] = new String[5];
for (int x=0; x < args.length; x++)
names[x] = args[x];
System.out.println(names[2]);
}
}
and the command line invocation is
java X a b
x = 0;
if (x1.hashCode() != x2
x = 0;
if (x1.hashCode() != x2
Practice Declarations and Access Control –
x = 0;
if (x1.hashCode() != x2.hashCode() )
x = x + 1;
if (x3.equals(x4) )
x = x + 10;
if (!x5.equals(x6) )
x = x + 100;
if (x7.hashCode() == x8.hashCode() )
x = x + 1000;
System.out.println("x = " + x);
and assuming that the equals() and hashCode() methods are property implemented, if the output is “x = 1111“, which of the following statements will always be true?
Which two statements are true about comparing two instances of the
Which two statements are true about comparing two instances of the
Practice Declarations and Access Control –
Which two statements are true about comparing two instances of the same class, given that the equals() and hashCode() methods have been properly overridden?
If the equals() method returns true, the hashCode() comparison == must return true.If the equals() method returns false, the hashCode() comparison != must return true.If the hashCode() comparison == returns true, the equals() method must return true.If the hashCode() comparison == returns true, the equals() method might return true.
In the given program, how many lines of output will be produced?
In the given program, how many lines of output will be produced?
Practice Declarations and Access Control –
In the given program, how many lines of output will be produced?
public class Test {
public static void main(String [] args) {
int [][][] x = new int [3][][];
int i, j;
x[0] = new int[4][];
x[1] = new int[2][];
x[2] = new int[5][];
for (i = 0; i < x.length; i++) {
for (j = 0; j < x[i].length; j++) {
x[i][j] = new int [i + j + 1];
System.out.println("size = " + x[i][j].length);
}
}
}
}
Which one creates an instance of an array?
Which one creates an instance of an array?
Practice Declarations and Access Control –
Which one creates an instance of an array?
Which cause a compiler error?
Which cause a compiler error?
Practice Declarations and Access Control –
Which cause a compiler error?
Which three form part of correct array declarations?
Which three form part of correct array declarations?
Practice Declarations and Access Control –
Which three form part of correct array declarations?
public int a [ ]static int [ ] apublic [ ] int aprivate int a [3]private int [3] a [ ]public final int [ ] a
Practice Declarations and Access Control –
What will be the output of the program?
public class ArrayTest {
public static void main(String[ ] args) {
float f1[ ], f2[ ];
f1 = new float[10];
f2 = f1;
System.out.println("f2[0] = " + f2[0]);
}
}