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String[] a;
//...
String str = Arrays.toString(a);
String[] arr = { "a", "b", "c" };
StringBuffer sb = new StringBuffer();
for (int i = 0; i < arr.length; i++) {
sb.append(arr[i]);
if (i < arr.length - 1) {
sb.append(",");
}
}
System.out.println(sb.toString());