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Questions and Answers
What should be the name and extension of the file where the given Java source code should be stored?
public class Test{
public static void main(String[ ] args){
System.out.println("Hello World");
}
}
What should be the name and extension of the file where the given Java source code should be stored?
public class Test{ public static void main(String[ ] args){ System.out.println("Hello World"); } }
Test.java
Which of the following is a valid identifier?
Which of the following is a valid identifier?
class rand
Which of the following code displays the area of a circle if the radius is positive?
Which of the following code displays the area of a circle if the radius is positive?
if (radius > 0) System.out.println(radius * radius * 3.14159);
What is the output of the attached statement if x = 1, y = -1, and z = 1?
What is the output of the attached statement if x = 1, y = -1, and z = 1?
What is the output of the attached statement if x = 1, y = -1, and z = 1?
What is the output of the attached statement if x = 1, y = -1, and z = 1?
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Study Notes
Java Class Definition
- A Java class definition should be stored in a file with a
.javaextension, with the file name matching the class name (e.g.Test.javafor a class namedTest).
Valid Identifiers
- Valid identifiers in Java do not include keywords (e.g.
class), numbers at the beginning (e.g.8+9), or special characters (e.g.9X,$43).
Conditional Statements
- The
ifstatement is used to execute code based on a condition. if (radius = 0)is not a valid condition, as=is an assignment operator, not a comparison operator.if (radius > 0)is a valid condition to check if the radius is positive.if (radius .< 0)is not a valid condition, as there is no.<operator in Java.if (radius .= 0)is not a valid condition, as there is no.=operator in Java.
Logical Operators
- The
andoperator in Java is represented by&&. - The
oroperator in Java is represented by||. x < 0 and z < 0is not a valid Java statement, usex < 0 && z < 0instead.x < 0 and z > 0is not a valid Java statement, usex < 0 && z > 0instead.
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