How Do I Fix "variable might not have been initialized" error in Java?

for (int i = 0; i < kids.length; i++){
			FileInputStream dis = new FileInputStream(args[0] + "/" + kids[i].getName());
			FileChannel dc = dis.getChannel();
			ByteBuffer byteb = ByteBuffer.allocate((int)dc.size());
			fc.read(byteb);
			fc.close();
			String fileBox = new String(byteb.array());
			String[] tempWords = fileBox.split("\\s+");
			double[] hamzProb;
			double[] spamzProb;
			int y = 0;
			for (int x = 0; x < tempWords.length; x++){
				if (dictList.containsKey(tempWords[x])){
					hamzProb[y] = (Double) dictList.get(tempWords[i]);
					spamzProb[y] = (Double) dictList.get(tempWords[i]);
					//hamzProb[y] = Float.valueOf(hamValue.trim()).floatValue();
					//spamzProb[y] = Float.valueOf(spamValue.trim()).floatValue();
					y++;
				}
			}
			double totalSpamProb = 1.0;
			double totalHamProb = 1.0;
			for (int z = 0; z < spamzProb.length; i++){
				totalSpamProb = totalSpamProb * spamzProb[z];//Float.valueOf(spamzProb[z].trim()).floatValue();
				totalHamProb = totalHamProb * hamzProb[z];//Float.valueOf(hamzProb[z].trim()).floatValue();
			}
			float spam_probability = Float.valueOf(args[3].trim()).floatValue();