Hey, so im making a game for my programming class. The basic idea is to be a simple 2d old school street fighter style game, the problem I'm having happens to be with jumping. I would like to make it, so if the up key is pressed, the character will raise a predetermined amount (A constant I have) and then descend back down to the ground. I;m still rather new to greenfoot and java so please explain how you make something work please :]
Heres my current code that works for walking, but not for jumping.
  import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.util.*;
import java.awt.*;
/**
 * Write a description of class char1 here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class char1 extends Characters
{
    public static final double TE_SPD = 5.0;
    public static final double TE_JMP = 100.0;
    /**
     * Act - do whatever the char1 wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
      move1();
      jump1();
    }    
    
    public void move1()
    {
        if(Greenfoot.isKeyDown("right"))
        {
            int x = (int) Math.round(getX() + TE_SPD);
            int y = (int) Math.round(getY());
            setImage("Char1Right.png");
            setLocation(x,y);
        }
        if(Greenfoot.isKeyDown("left"))
        {
            int x = (int) Math.round(getX() - TE_SPD);
            int y = (int) Math.round(getY());
            setImage("Char1Left.png");
            setLocation(x,y);
        }
        else
        {
        }
    }
    public void jump1()
    {
        if(Greenfoot.isKeyDown("up"))
        {
            jumptiming();
            jumptiming();
            jumptiming();
            gravity();
            gravity();
            gravity();
        }
    }
    
    public void jumptiming()
    {
            int x = (int) Math.round(getX());
            int y = (int) Math.round(getY() + TE_JMP);
            setLocation(x,y);
            try
                {
                    Thread.sleep(500);
                }
            catch(InterruptedException e)
                {
                }
    }
    
    public void gravity()
    {
            int x = (int) Math.round(getX());
            int y = (int) Math.round(getY() - TE_JMP);
            setLocation(x,y);
            try
                {
                    Thread.sleep(500);
                }
            catch(InterruptedException e)
            {
            }
    }
 } 
          
         
   

