Read, decide, print

In the second pattern the input decides what the program prints. Between reading and printing there's an if:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int battery = Integer.valueOf(scanner.nextLine());
        if (battery < 20) {
            System.out.println("Charge soon");
        } else {
            System.out.println("Battery OK");
        }
    }
}

12

Charge soon

A decision can also change a value instead of printing: the if fixes up a variable, and one print line after it shows the result. This keeps the printing in one place:

int speed = 140;
if (speed > 120) {
    speed = 120;
}
System.out.println("Speed: " + speed);

Speed: 120