can anyone help me with this error I have here

Code:
Map amount  = 660Exception in thread "Thread-3" java.lang.OutOfMemoryError: Java heap space
        at Background.<init>(Background.java:35)
        at client.startUp(client.java:8415)
        at RSApplet.run(RSApplet.java:84)
        at client.run(client.java:5287)
        at java.lang.Thread.run(Thread.java:745)
This is with my client when I try to load it up.....

These was the files I tried to add to my cache....