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Array of Ref Quiz

Last updated almost 2 years ago

10 questions

1

1

1

1

1

1

1

1

1

1

Question 1

1.

What is output by the code below?

String[] x;
x = new String[6];
System.out.println( x[2] );

one

two

three

null

0

Question 2

2.

What is output by the code below?

String[] x;
x = new String[7];
x[1] = "go";
x[4] = "up";
x[2] = "by";
System.out.println( x[1] );

by

up

go

null

at

Question 3

3.

What is output by the code below?

String[] x;
x = new String[7];
x[1] = "go";
x[4] = "up";
x[2] = "by";
System.out.println( x[0] );

go

up

by

null

at

Question 4

4.

What is output by the code below?

String[] x;
x = new String[7];
x[1] = "go";
x[4] = "up";
x[2] = x[4];
x[4] = null;
System.out.println( x[2] );

go

up

by

null

at

Question 5

5.

What is output by the code below?

String[] x;
x = new String[7];
x[1] = "go";
x[4] = "up";
x[2] = x[4];
x[4] = null;
System.out.println( x[2].length() );

2

1

3

null

4

Question 6

6.

Consider the following class definitions.

public class Cat
{
private String name:
private int age;
public Cat( String n, int a )
//implementation not shown

public String getName()
//implementation not shown

public int getAge()
//implementation not shown

//other methods not shown
}
//client code in another class
Cat[] bunch = new Cat[5];
System.out.println( bunch[0] );

null

0

2

3

5

Question 7

7.

Consider the following class definitions.

public class Cat
{
private String name:
private int age;
public Cat( String n, int a )
//implementation not shown

public String getName()
//implementation not shown

public int getAge()
//implementation not shown

//other methods not shown
}
//client code in another class
Cat[] bunch = new Cat[5];
System.out.println( bunch.length );

null

0

2

3

5

Question 8

8.

Consider the following class definitions.

public class Cat
{
private String name:
private int age;
public Cat( String n, int a )
//implementation not shown

public String getName()
//implementation not shown

public int getAge()
//implementation not shown

//other methods not shown
}
//client code in another class
Cat[] bunch = new Cat[5];
bunch[0] = new Cat("rocket", 8);
System.out.println( bunch[0].getAge() );

null

0

8

3

5

Question 9

9.

Consider the following class definitions.

public class Cat
{
private String name:
private int age;
public Cat( String n, int a )
//implementation not shown

public String getName()
//implementation not shown

public int getAge()
//implementation not shown

//other methods not shown
}
//client code in another class
Cat[] bunch = new Cat[5];
bunch[0] = new Cat("rocket", 8);
bunch[3] = new Cat("sam", 15);
bunch[4] = new Cat("ben", 12);
System.out.println( bunch[3].getAge() );

null

15

12

3

8

Question 10

10.

Consider the following class definitions.

public class Cat
{
private String name:
private int age;
public Cat( String n, int a )
//implementation not shown

public String getName()
//implementation not shown

public int getAge()
//implementation not shown

//other methods not shown
}
//client code in another class
Cat[] bunch = new Cat[5];
bunch[0] = new Cat("rocket", 8);
bunch[3] = new Cat("sam", 15);
bunch[4] = bunch[3];
bunch[3] = bunch[0];
System.out.println( bunch[4].getAge() );

null

15

12

3

8