I'm not sure what you're asking. What are jumps and blocks?

In your setup function, you have this:

@hellochar:

the jumps are rectangles to jump on top of, and the blocks are coin blocks, as in mario, where you hit them and a coin pops out.  They interact with the character by having it be able to jump on both jumps and blocks, and the blocks being able to be hit.  It all works well and good, but it only lets me hit the last block out of the blocks I make, and only the last jump because the array only uses the last variable of the jxs and the bxs.

@jbum:

Okay, how would I be able to write that?  Would I have to put something in the nicolai class so that I can have more that one jump (like an ArrayList?) in the constructor?

Ah, after 6 topics, I only understand that jumps are actually objects, not an action. Confusing terminology. I would have called your jumps "blocks" and your blocks "coins"...

Anyway, you don't put your jumps in the nicolai class. You create jumps and blocks separately (as jbum wrote, separate the loops, don't nest them) and in the logic of your code (separated from these classes, can be isolated in a GameField class if you want), make them to interact.
For example, this logic will check nicolai's position relative to all jumps and blocks, and see if it intersects (hit) them. And change trajectory (rebound?) or game field (takes blocks) accordingly.

Are you saying I should put all of the actions into the Gamefield class (like nicolai doing the action of jumping?) or just the interaction between them.  Also, even without the nested loops, it still only counts of the jumping blocks instead of all of them.

nicolai jumping is more attached to the object, as it affects the way it moves. nicolai hitting a block or coin must be managed by the game field. But when such hit is detected, it should change the state of nicolai: it will change its trajectory, for example. You will have constant hit checking, against obstacles, and against the ground, such check belongs to the game field which will notify nicolai it can no longer go down, for example.

Perfect, thank you, but how do I get it to work for all of them?  The code I have is this

1. jumps=new ArrayList();
2.   blocks=new ArrayList();
3.   for(int i=0; i<jxs.length; i++){
4.     jumps.add(new jump(jxs[i]));}
5.   for(int i=0; i<bxs.length; i++){
6.     blocks.add(new block(bxs[i],300,n1));}
7.     for (int i = jumps.size()-1; i >= 0; i--) {
8.       j1 = (jump) jumps.get(i);
9.     }
10.     for (int i = blocks.size()-1; i >= 0; i--) {
11.        b1 = (block) blocks.get(i);
12.     }
13.   n1=new nicolai();
14.   g1=new gamefield(n1,j1,b1,p1);

for setup, and then I just the j1.display() and the b1.display() in draw because i can't have the for loop for j1 and b1 in draw without a nullpointerexception error coming up because g1 doesn't read j1 and b1 without it in setup.

Here is some very straight foward code that shows how to do interactions between a single hero sprite and an arrayList of objects.  For the time being, forget what you wrote, and look at this carefully for a few minutes.  Then consider rewriting what you wrote.