Questions
1. When you compile a program written in the Java programming language, the compiler converts the human-readable source file into platform-independent code that a Java Virtual Machine can understand. What is this platform-independent code called?2. Which of the following is not a valid comment:
a.3. What's the first thing you should check if you see the following error at runtime:/** comment */
b./* comment */
c./* comment
d.// comment
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp.java.
4. What is the correct signature of the
main
method?5. When declaring the
main
method, which modifier must come first,public
orstatic
?6. What parameters does the
main
method accept?Exercises
1. Change theHelloWorldApp.java
program so that it displaysHola Mundo!
instead ofHello World!
.2. Get the following file from the online Tutorial:
Useless.java
Compile and run this program. What is the output?3. You can find a slightly modified version of
HelloWorldApp
here:HelloWorldApp2.java
The program has an error. Fix the error so that the program successfully compiles and runs. What was the error?4. Download the following two source files:
Compile the files, and then run the resulting program. What is the output? If you have trouble compiling the files but have successfully compiled before, try unsetting theFirstClass.java
SecondClass.java
CLASSPATH
environment variable, and then compile again.