Java 17 Recipes

Listing 1-2. A “Hello, World” Example
package org.java17recipes.chapter01.recipe01_05;
public class HelloWorld {
/* The main method begins in this class */
public static void main(String[] args) {
ChApteR 1 GettInG StARted wIth JAvA 17

---

18
HelloMessage hm;
hm = new HelloMessage();
System.out.println(hm.getMessage());
hm.setMessage("Hello, World");
System.out.println(hm.getMessage());
}
}
The second class, HelloMessage, is a container class that holds a string-based 
message.
Listing 1-3. A “Message” Example
package org.java17recipes.chapter01.recipe01_05;
public class HelloMessage {
private String message = "";
public HelloMessage() {
this.message = "Default Message";
}
public void setMessage (String m) {
this.message = m;
}
public String getMessage () {
//it changes the message to uppercase
return message.toUpperCase();
}
}
Make sure you have pasted (or typed) the code. Compile and run the program.
Right- click in the project and select Run As ➤ Java Application, as shown in Figure 
1-15
.
ChApteR 1 GettInG StARted wIth JAvA 17

---

19
Figure 1-15. Running a project in Eclipse IDE
Now you should see the following output.
DEFAULT MESSAGE
HELLO, WORLD
This output appears in a new view named Console, which Eclipse opens at the 
bottom of the IDE window, as shown in Figure 
1-16
.
Figure 1-16. Console view in Eclipse IDE
ChApteR 1 GettInG StARted wIth JAvA 17

---

20
 How It Works
You can run almost all the solutions in this chapter using the same general technique 
shown in this recipe. For that reason, we show the step-by-step screenshots this 
one time.