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This would be better:

for(int j = arrayOne.length; j < mergedArray.length; j++)
mergedArray[j] = arrayTwo[j-arrayOne.length]
Don't hard code magic numbers. Use variable values. What if the...

Please post the program's input and output that shows what it did and what didn't work the way you want.

A useful method for debugging with arrays:

System.out.println("an ID "+...