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1. Using the Eclipse IDE for Java programming
1) Install the Java Development Kit (JDK) and check its version.
Help: Installation of Java.
2) Download and install the Eclipse IDE for Java Developers.
Help: Download and installation of the Eclipse IDE for Java Developers.
3) Start the Eclipse IDE and verify JDK installation.
Help: Starting the Eclipse IDE.
Help: Preparing the workbench.
4) Create a new Java project named task01.
5) Create a package and Java class.
Help: Create package.
Hint: Use the following package name:
ua.khpi.oop.your_first_name.task01.Hint: Use the following class name:
Main.
6) Change the class based on the following listing.
package your_package_name;
public class your_class_name {
public static void main(String[] args) {
System.out.println("Hi your_first_name!");
}
}
7) Launch your application in Eclipse.
Help: Run your project in Eclipse.
8) Create JAR file and launch your application outside Eclipse.
9) Create new class named Calculator based on the following listing and solve all TODOs.
package your_package_name;
public class Calculator {
public int inc(int a) {
// TODO Add one to 'a'
// TODO return your calculated value
// instead of 0
return 0;
}
public int dec(int a) {
// TODO Subtract one from 'a'
// TODO return your calculated value
// instead of 0
return 0;
}
public int sum(int a, int b) {
// TODO Calculate the sum of 'a' and 'b'
// TODO return your calculated value
// instead of 0
return 0;
}
public String check(int a) {
// TODO Check that 'a' is positive or negative.
// If 'a' is positive return "positive".
// If 'a' is negative return "negative".
// If a is zero return "zero".
return "";
}
}
10) Change your Main class based on the following listing, launch it and check output results.
package your_package_name;
public class Main {
public static void main(String[] args) {
Calculator calculator = new Calculator();
int intResult;
intResult = calculator.inc(1);
System.out.println(intResult);
intResult = calculator.dec(1);
System.out.println(intResult);
intResult = calculator.sum(2, 3);
System.out.println(intResult);
String strResult;
strResult = calculator.check(1);
System.out.println(strResult);
strResult = calculator.check(-1);
System.out.println(strResult);
strResult = calculator.check(0);
System.out.println(strResult);
}
}
Extra
Explain the result of the following program fragment:
int a = 5;
int b = 10;
System.out.println((a > 5) && ((b = 99) == 10));
System.out.println(b);
System.out.println(((b = 99) == 10) && (a > 5));
System.out.println(b);
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