Exploring var with the Java Playground

Your Turn: Exploring var with the Java Playground

1. Run each example in the Java Playground.
2. Record the result, if any and explain why this was the given result.
3. If there is an error, explain the error and correct the code.
4. If a result was provided, re-write the code segment with the proper data type instead of var and re-run the code.

Practice 1

Practice 2

Practice 3

Practice 4

Practice 5

• Modify the enhanced-for loop to use a traditional for loop. Use var when declaring the loop control variable.

Practice 6

Practice 7

• Using var, add another Dog object named finn and assign it to null.

Practice 8

• Modify the Dog class by adding a bark method.
• While declaring sound of type var works, it isn't recommended. Explain why?

Practice 9

• This code segment contains one improper use of var. On which line is var being used improperly?
• Modify the code by replacing one case of var with a data type.

Practice 10

• This code segment contains one improper use of var. On which line is var being used improperly?
• Modify the code by replacing one case of var with a data type.

Practice 11

• This code segment contains one improper use of var. On which line is var being used improperly?
• Modify the code by replacing one case of var with a data type.

Practice 12

• This code segment contains one improper use of var. On which line is var being used improperly?
• Modify the code by replacing one case of var with a data type.

Pracitce 13

• On which line is var being used improperly?
• Modify the code so numbers is declared var rather than var[] and assigned an int array of size 3.
• Modify the code to initialize numbers to 1, 2, 3 using a for each loop.