Beginner Java Modding Problem...

Hello im trying to use Keyboard.isKeyDown to create a way to make it so if the button is pressed something will happen and if I press the button again it will stop. I have the basic concept worked out, and I HAD it working with another thing but for some reason this code won't work (im making mods for a Java game using Java Eclipse EE):

Code:

---

                if(Keyboard.isKeyDown(36) && buttonpress==false){
                        buttonpress=true;
                        whattodo=!whattodo;
                }
                if(!Keyboard.isKeyDown(36)){
                        buttonpress=false;
                }
                if(whattodo=false){
                        moty=0.41999998688697815D;
                }
                if(whattodo=true){
                        moty=0.71999998688697815D;
                }

---

whattodo and buttonpress are booleans and moty is a double. moty is the variable for MotionY. Later on in this code I use this (or something like it, its not the exact code) to call it

Code:

---

Public class Jump(){
MotionY = moty;
}

---

Im trying to make it so when I press "J" or J = true MotionY is .3 higher (A very noticable difference)

Use a Swing Timer. I would also use key binding rather than a key listener to check for key press.

Also, this is messed up:

Code:

---

                if(whattodo=false){
                        moty=0.41999998688697815D; // ??? what's the D for ???
                }
                if(whattodo=true){
                        moty=0.71999998688697815D;
                }

---

You are not checking for equality which uses ==, but you don't even want to. To check if a boolean is true you simply do

Code:

---

                if (!whattodo) {
                        moty=0.41999998688697815;
                } else {
                        moty=0.71999998688697815;
                }

---

Okay so I tried this and it doesn't work... MotionY always stays at the .4 one.

Code:

---

    protected void jump()
    {
                if(Keyboard.isKeyDown(36) && !buttonpress){
                        buttonpress=true;
                        whattodo=!whattodo;
                }
                if(!Keyboard.isKeyDown(36)){
                        buttonpress = false;
                }
                if (!whattodo) {
                        moty=0.41999998688697815D;
                } else {
                        moty=0.71999998688697815D;
                }
        motionY = moty;
    }

---

Solved thank you :)