I need Help Creating A "for loop" for some really basic java code. Plz help

I am in university and have just started programming. we were told to create an image comprising of only squares circles and triangles and also to make it mov.
i created a boat comprising of 4 squares and a triangle for the sail.
the image is complete however when i compile it and run it each square moves at a different time so the boat doesn't look like its moving instead it looks like different shapes are moving at different times.
i was told i could make all of the shapes move at the same time using a for loop moving each shape one pixel at a time however i have no idea how to implement this. here is the code below which i have written so far.
somebody plz help :(

Code :

---

public class Picture
{
	private Square ocean;
	private Square boat;
	private Triangle sail;
	private	Circle sun;
	private Square sail2;
	private Square sail3;
	private Square boat2;
 
	/**
	 * Constructor for objects of class Picture
	 */
	public Picture()
	{
		// nothing to do... instance variables are automatically set to null
	}
 
	/**
	 * Draw this picture.
	 */
	public void draw()
	{
		ocean = new Square();
		ocean.moveVertical(150);
		ocean.changeSize(800);
		ocean.makeVisible();
		ocean.changeColor("blue");
		ocean.moveHorizontal(-60);
 
		boat = new Square();
		boat.changeColor("black");
		boat.moveHorizontal(20);
		boat.moveVertical(100);
		boat.makeVisible();
		boat.changeSize(70);
 
 
		boat2 = new Square();
		boat2.makeVisible();
		boat2.changeColor("black");
		boat2.moveHorizontal(90);
		boat2.moveVertical(100);
		boat2.changeSize(70);
 
 
		sail = new Triangle();	
		sail.changeSize(100, 70);
		sail.moveHorizontal(75);
		sail.moveVertical(15);
		sail.makeVisible();
		sail.changeColor("red");
 
		sail2 = new Square();
		sail2.changeColor("black");
        sail2.changeSize(20);
        sail2.moveHorizontal(65);
        sail2.moveVertical(80);
        sail2.makeVisible();
 
        sail3 = new Square();
        sail3.changeColor("black");
        sail3.changeSize(20);
        sail3.moveVertical(80);
        sail3.moveHorizontal(40);
 
 
		sun = new Circle();
		sun.changeColor("yellow");
		sun.moveHorizontal(350);
		sun.moveVertical(-100);
		sun.changeSize(90);
		sun.makeVisible();
	    sun.slowMoveVertical(110);
	}
 
 
 
	/**
	 * Change this picture to black/white display
	 */
	public void setBlackAndWhite()
	{
		if(ocean != null)   // only if it's painted already...
		{
			ocean.changeColor("black");
			boat.changeColor("white");
			sail.changeColor("black");
			sun.changeColor("black");
		}
	}
 
	/**
	 * Change this picture to use color display
	 */
	public void setColor()
	{
		if(ocean != null)   // only if it's painted already...
		{
			ocean.changeColor("red");
			boat.changeColor("black");
			sail.changeColor("green");
			sun.changeColor("yellow");
		}
	}
 
}

---

you are going to have to use a for loop to move then a little bit at a time (each)

I see 5 things here, 4 squares and a triangle
boats 1 and 2, sails 1 2 and 3

We can move it to the right like this, lets say ..move right by 90 pixels

I am not sure how well this will work since it may happen very fast, try it and fiddle with it (try changing how much it moves every cycle? from 3 to 1 maybe ..maybe from 3 to 6?)

for(int i=0; i < 30 ; ++i)
{
boat1.slowMoveHorizontal(3);
boat2.slowMoveHorizontal(3);
sail1.slowMoveHorizontal(3);
sail2.slowMoveHorizontal(3);
sail3.slowMoveHorizontal(3);
}

basically I will run the code in the { } 30 times,
the first section declares a variable i and sets it to 0
next it says keep running this code while i is still less than 30
next it says to add 1 to i every time..

Every time it runs it will move each boatpart a little bit...might look kinda funny though
(notice it runs 30 times, and moves each time 3 pixels...total 90)

in my opinion this is a stupid assignment to be teaching...for loops shouldn't be bothered with till you learn most of the even more basics...

I got it to work!!!!!!!
im so grateful for your help.
thank you