Package declaration :
The statement order is as follows. Comments can go anywhere.
1- Package statment (optional).
2- Imports (optional).
3- Class or interface definitions.
Imports: three options :
-import javax.swing.;* : To make all classes visible altho only one is used.
-import javax.swing.JOptionPane; : To ake a single class visible.
-We can the fully qualified class name without an import. :
class ImportTest {
public static void main(String[] args) {
javax.swing.JOptionPane.showMessageDialog(null, "Hi");
System.exit(0);
}
}
Here are the types of loops that we can find in Java:
-
Simple for loop: A for loop is a control structure that allows us to repeat certain operations by incrementing and evaluating a loop counter.
-
Enhanced for-each loop.
-
While loop: The while loop is Java's most fundamental loop statement. It repeats a statement or a block of statements while its controlling Boolean-expression is true.
-
Do-While loop:The do-while loop works just like the while loop except for the fact that the first condition evaluation happens after the first iteration of the loop.