Questions and Exercises: Variables - Java Tutorial 5.0 英文版

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Trail: Learning the Java Language
Lesson: Language Basics

Questions and Exercises: Variables

Questions

Which of the following are valid variable names?
int
anInt
i
i1
1
thing1
1thing
ONE-HUNDRED
ONE_HUNDRED
something2do
Answer the following questions about the BasicsDemo program.

What is the name of each variable declared in the program? Remember, method parameters are also variables.
What is the data type of each variable?
What is the scope of each variable?

Exercises

Modify the MaxVariablesDemo program so that aBoolean has a different value.
Rewrite the MaxVariablesDemo program to display the minimum value of each integer data type. You can guess what the names of these variables are, or you can look them up in the API documentation.
Can you guess the name of a method in the Character class that you can use instead of isUpperCase to determine the capitalization of a character? Modify the MaxVariablesDemo program to use that method instead of isUpperCase.

Check your answers.

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